Acid addition salts of piperazine derivatives

Abstract

The invention relates to acid addition salts of piperazine derivatives, as well as solid forms, such as polymorphic forms, thereof, which are useful as pharmaceutical ingredients and, in particular, as glycosidase inhibitors.

Claims

1. An acid addition salt of hydrochloric acid, maleic acid, tartaric acid, sulfuric acid, or p-toluolsufonic acid with one of the following compounds: ##STR00147##

2. An acid addition salt selected from the group consisting of: N-(5-{4-[(1 S)-1-(2,3-dihydro-1-benzofuran-6-yl)ethyl]piperazin-1-yl}-1,3,4-thiadiazol-2-yl)acetamide, mono-hydrochloride; N-(5-{4-[(1 S)-1-(2H-1,3-benzodioxol-5-yl)ethyl]piperazin-1-yl}-1,3,4-thiadiazol-2-yl)acetamide, mono-hydrochloride; 2-{4-[(1S)-1-(2H-1,3-benzodioxol-5-yl)ethyl]piperazin-1-yl}-N-methyl-1,3-thiazole-5-carboxamide, mono-hydrochloride; 2-{4-[(1S)-1-(2H-1,3-benzodioxol-5-yl)ethyl]piperazin-1-yl}-N-methylpyrimidine-5-carboxamide, mono-hydrochloride; N-(2-{4-[(1 S)-1-(2H-1,3-benzodioxol-5-yl)ethyl]piperazin-1-yl}pyrimidin-5-yl)acetamide, mono-hydrochloride; and 2-{4-[(1S)-1-(2,3-dihydro-1-benzofuran-6-yl)ethyl]piperazin-1-yl}-4H,5H,6H,7H-[1,3]thiazolo[5,4-c]pyridin-4-one, mono-hydrochloride.

3. A solid oral dosage form comprising the acid addition salt of claim 1.

4. A solid oral dosage form comprising the acid addition salt of claim 2.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention is further illustrated by reference to the accompanying figures:

(2) FIG. 1: Characteristic X-ray powder diffraction pattern of crystalline Example 69 sulphate salt obtained in THF

(3) FIG. 2: Characteristic X-ray powder diffraction pattern of crystalline Example 69 maleate salts obtained in ethanol, acetone, ethyl acetate

(4) FIG. 3: Characteristic X-ray powder diffraction pattern of crystalline Example 69 maleate salt obtained in MeCN

(5) FIG. 4: Characteristic X-ray powder diffraction pattern of crystalline Example 69 fumarate salt obtained in alcohol/water mixtures

(6) FIG. 5: Characteristic X-ray powder diffraction pattern of crystalline Example 69 L-tartrate salts obtained in ethanol, acetone, MeCN, THF, methanol/water

(7) FIG. 6: Characteristic X-ray powder diffraction pattern of crystalline Example 69 Tosylate salts obtained in acetone, MeCN

(8) FIG. 7: Characteristic X-ray powder diffraction pattern of crystalline Example 69 free base

(9) FIG. 8: Characteristic Raman spectrum of crystalline Example 69 free base

(10) FIG. 9: Characteristic STA thermogram of crystalline Example 69 free base

(11) FIG. 10: Characteristic DSC thermogram of crystalline Example 69 free base

(12) FIG. 11: Characteristic X-ray powder diffraction pattern of crystalline Example 69 hydrochloride salt

(13) FIG. 12: Characteristic Raman spectrum of crystalline Example 69 hydrochloride salt

(14) FIG. 13: Characteristic NMR spectrum of crystalline Example 69 hydrochloride salt

(15) FIG. 14: Characteristic STA thermogram of crystalline Example 69 hydrochloride salt

(16) FIG. 15: Characteristic DSC thermogram of crystalline Example 69 hydrochloride salt

(17) FIG. 16: Characteristic X-ray powder diffraction pattern of crystalline Example 69 maleate salt obtained from EtOH

(18) FIG. 17: Characteristic NMR spectrum of crystalline Example 69 maleate salt obtained from EtOH

(19) FIG. 18: Characteristic STA thermogram of crystalline Example 69 maleate salt obtained from EtOH

(20) FIG. 19: Characteristic DSC thermogram of crystalline Example 69 maleate salt obtained from EtOH

(21) FIG. 20: Characteristic X-ray powder diffraction pattern of crystalline Example 69 L-tartrate salt

(22) FIG. 21: Characteristic NMR spectrum of crystalline Example 69 L-tartrate salt

EXAMPLES

(23) The compounds according to Formula (I) can be prepared from readily available starting materials by several synthetic approaches, using both solution-phase and solid-phase chemistry protocols or mixed solution and solid phase protocols. Examples of synthetic pathways are described below in the examples. All reported yields are non optimized yields. Unless otherwise stated, compounds of Formula (I) and related formulae obtained as a racemic mixture can be separated to provide an enantiomerically enriched mixture or a pure enantiomer.

(24) The commercially available starting materials used in the following experimental description were purchased from Aldrich, Sigma, ACROS, ABCR, Combi-Blocks, Matrix, Apollo scientific, Alfa Aesar, etc. unless otherwise reported.

(25) The HPLC, MS and NMR data provided in the examples described below are obtained as followed:

(26) .sup.1H NMR analyses were carried out using BRUKER NMR, model AV-II and AV-III 400 MHz FT-NMR. Residual signal of deuterated solvent was used as internal reference. Chemical shifts (δ) are reported in ppm in relative to the residual solvent signal (δ=2.50 for .sup.1H NMR in DMSO-d.sub.6, and 7.26 in CDCl.sub.3), s (singlet), d (doublet), t (triplet), q (quadruplet), br (broad), quint (quintuplet).

(27) The MS data provided in the examples described below were obtained as followed: Mass spectrum: LC/MS Agilent (ESI/APCl), Chemstration, 1200 Series.

(28) LCMS Methods:

(29) Method A

(30) Method: A-0.1% TFA in H.sub.2O, B—0.1% TFA in ACN: Flow—2.0 mL/min.

(31) Column: XBridge C8 (50×4.6 mm, 3.5 μm+ve mode

(32) Method B

(33) Method: A-10 mM NH.sub.4HCO.sub.3 in H.sub.2O, B—ACN: Flow ˜1.0 mL/min.

(34) Column: XBridge C8 (50×4.6 mm, 3.5 μm),+ve mode

(35) Method C

(36) Method: A-10 mM NH.sub.4HCO.sub.3 in H.sub.2O, B—ACN: Flow ˜1.0 mL/min.

(37) Column: XBridge C8 (50×4.6 mm, 3.5 μm), -ve mode

(38) HPLC analyses were obtained using Agilent 1200 Series instruments as followed using % with UV detection (maxplot).

(39) Method A

(40) Method: A-0.1% TFA in H.sub.2O, B—0.1% TFA in ACN: Flow ˜2.0 mL/min.

(41) Column: XBridge C8 (50×4.6 mm, 3.5 μm).

(42) Method B

(43) Method: A-10 mM NH.sub.4HCO.sub.3 in H.sub.2O, B—ACN: Flow −1.0 mL/min.

(44) Column: XBridge C8 (50×4.6 mm, 3.5 μm).

(45) Method C

(46) Method: Gradient from 70% H.sub.2O (10 mM K.sub.2HPO.sub.4): 30% MeCN to 70% MeCN over 15 minutes, Flow: 1 mL/min. Column: XTERRA RP18 (250×4.6) mm, 5 μm

(47) Chiral HPLC

(48) Method A

(49) Mobile Phase: 0.1% DEA in n-HEXANE:IPA: 60:40; COLUMN: CHIRALPAK AD-H (250×4.6) mm: 5 μm, FLOW: 1.0 mL/min

(50) Method B: Mobile Phase: n-HEXANE:EtOH: 90:10: FLOW: 1.0 mL/min; COLUMN: CHIRALPAK IC (250×4.6) mm, 5 μm

(51) Method C:

(52) Mobile Phase: 0.1% TFA in n-HEXANE:IPA: 60:40; COLUMN: CHIRALcell OD-H (250×4.6) mm, 5 μm, FLOW: 1.0 mL/min

(53) Method D:

(54) Mobile Phase: 0.1% DEA in Hexane:EtOH: 80:20; FLOW: 1.0 mL/min: COLUMN: Chiralcell OJ-H column (250×4.6) mm, 5 μm

(55) Method E:

(56) Mobile Phase: 0.1% DEA in Hexane:EtOH: 80:20; FLOW: 1.0 mL/min; COLUMN: Chiralcell AY-H column (250×4.6) mm, 5 μm

(57) Method F:

(58) Mobile Phase: 0.1% DEA in Hexane:EtOH: 70:30; FLOW: 1.0 mL/min; COLUMN: Chiralpak IA (250×4.6) mm, 5 μm

(59) Method G:

(60) Mobile Phase: 0.1% DEA in Hexane:EtOH: 60:40; FLOW: 1.0 mL\min; COLUMN: Chiralcel OD-H (250×4.6) mm, 5 μm

(61) Method H:

(62) Mobile Phase: 0.1% DEA in n-Hexane:EtOH: 80:20; FLOW: 1.0 mL/min: COLUMN: CHIRALPAK IC (250×4.6) mm, 5 μm

(63) General flash chromatography conditions used for the purification of intermediates or compounds of Formula I: silica gel 230-400 mesh; gradients used as elutent: 10 to 80% EtOAc in Petroleum ether or 1 to 15% MeOH in DCM

(64) MD Autoprep Conditions

(65) The mass directed preparative HPLC purifications were performed with a mass directed autopurification Fractionlynx from Waters.

(66) Method A

(67) 0.1% HCOOH in H.sub.2O, B-MeOH or ACN, Column: Symmetry C8 (300 mm×19 mm), 7 μm

(68) Method B

(69) 0.1% TFA in H.sub.2O, B-MeOH or ACN, Column: Symmetry C8 (300 mm×19 mm), 7 μm

(70) Method C

(71) 10 mM NH.sub.4HCO.sub.3 in H.sub.2O, B-MeOH or ACN, Column: Symmetry C8 (300 mm×19 mm), 7 μm

(72) Method D

(73) 10 mM NH.sub.4OAC in H.sub.2O, B-MeOH or ACN, Column: Symmetry C8 (300 mm×19 mm), 7 μm

(74) Preparative HPLC Conditions

(75) Method PA

(76) 0.1% TFA in H.sub.2O, B-MeOH or ACN. Column: Sunfire C8 (19 mm×250 mm) 5 μm or Sunfire C18 (30 mm×250 mm) 10 μm

(77) Method PB

(78) 10 mM NH.sub.4HCO.sub.3 in H.sub.2O, β-MeOH or ACN, Column: Sunfire C8 (19 mm×250 mm) 5 μm or Sunfire C18 (30 mm×250 mm) 10 μm.

(79) Chiral Preparative Method PC

(80) Mobile phase: n-Hexane, IPA; Column: Chiral pak AD-H (20×250) mm, 5 micron, Flow: 12 mL/min

(81) Chiral Preparative Method PD:

(82) Mobile phase: n-Hexane, IPA; Column; Chiral pak AD-H (20×250) mm, 5 micron, Flow: 12 ml/min

(83) Chiral Preparative Method PE:

(84) Mobile phase: n-Hexane, IPA; Column: Chiralcell OD-H (20×250) mm, 5 micron, Flow: 12 mL/min

(85) Chiral Preparative Method PF:

(86) Mobile Phase: 0.1% DEA in Hexane:EtOH: 80:20; FLOW: 12.0 mL/min; COLUMN: Chiralcell OJ-H column (250×20) mm, 5 μm

(87) Chiral Preparative Method PG:

(88) Mobile Phase: 0.1% DEA in Hexane:EtOH: 80:20; FLOW: 20.0 mL/min; COLUMN: Chiralcell AY-H column (250×30) mm, 5 μm

(89) Chiral Preparative Method PH:

(90) Mobile Phase: n-HEXANE:ETOH: 90:10: FLOW: 20.0 mL/min; COLUMN: CHIRALPAK IC (250×30) mm, 5 μm

(91) Chiral Preparative Method PI:

(92) Mobile Phase: 0.1% DEA in Hexane:EtOH: 80:20; FLOW: 12.0 mL/min; COLUMN: Lux Cellulose C.sub.4 (250×21.2) mm, 5 μm

(93) Chiral Preparative Method PJ:

(94) Mobile Phase: 0.1% DEA in Hexane:EtOH: 70:30; FLOW: 12.0 mL/min; COLUMN: Chiralpak IA (250×20) mm, 5 μm

(95) Chiral Preparative Method PK:

(96) Mobile Phase: 0.1% DEA In Hexane:EtOH: 50:50; FLOW: 10.0 mL/min; COLUMN: Chiralpac IC (250×21) mm, 5 μm

(97) The SFC purifications were performed with a Prep SFC, THAR-SFC 80 and THAR-SFC 200.

(98) SFC analytical chiral method AA:

(99) COLUMN: YMC Cellulose SB (250×4.6) mm, 5 μm; CO-SOLVENTS: 0.5% DEA in Methanol 40%; FLOW: 4 mL/min:

(100) SFC preparative chiral method PA:

(101) COLUMN: YMC Cellulose SB (250×30) mm, 5 μm; CO-SOLVENTS: 0.5% DEA in Methanol 40%; FLOW: 60 mL/min;

(102) The microwave chemistry was performed on a single mode microwave reactor Initiator™ Sixty from Biotage.

(103) General Procedure for Ester Reduction of Heterocycles: Procedure A

(104) To a stirred solution of ester (1 equiv) in dry THF (20 to 35 mL), lithium triethylborohydride (1 M solution in THF, 1.7 equiv) was added slowly at 0° C. The reaction mixture was stirred at room temperature for 2 h. The completion of the reaction was monitored by TLC. Reaction mixture was cooled to 0° C. and quenched using 10% ammonium chloride solution. Solvent was removed under vacuum and resulting residue was purified by flash column chromatography to afford the desired product.

(105) General Procedure for Chlorination of Hetrocyclic Alcohol: Procedure B

(106) To a stirred solution of alcohol (1 equiv) in dry DCM (10 to 20 mL), thionyl chloride (1.7 to 3 equiv) was added slowly at 0° C. The reaction mixture was warmed to rt and was refluxed for 1 h. The reaction mixture was concentrated under vacuum and the resulting residue was diluted with DCM (20 to 50 mL). The DCM layer was washed with water (5 to 10 mL), brine solution (5 to 10 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum to give chloro compound.

(107) General Procedure for Reductive Amination: Procedure C

(108) To a solution of aldehyde (1 equiv) in dry THE (4 to 10 mL), amine (0.8 to 1.1 equiv), acetic acid (7 equiv) was added at room temperature and stirred for 30 min. Then the reaction mixture was cooled to 0° C. and sodium triacetoxy borohydride (1.2 equiv) was added slowly. The resulting reaction mixture was stirred at room temperature for 16 h. The reaction mixture was concentrated, the crude product was diluted with (10 to 20 mL) EtOAc and the organic layer was washed with (10-20 mL) of brine. The organic layer was separated, dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The crude products were purified by flash column chromatography to afford the desired product.

(109) General Procedure for N-Alkylation: Procedure D

(110) To a stirred solution of amine (1 mmol/0.8 to 1 equiv) in dry DMF (5 to 10 mL), chloro compound (1.0 to 1.2 equiv) and potassium carbonate (2 equiv) were added at rt. The resulting mixture was heated at 90° C. for 16 h. It was concentrated under vacuum and the resulting residue was diluted with DCM (20 to 50 mL). The DCM layer was washed with water (5 to 10 mL), brine solution (5 to 10 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The crude products were purified by flash chromatography to afford the desired product.

(111) General Procedure for N Alkylation: Procedure E

(112) To a stirred solution of amine (1 mmol/1 equiv) in acetonitrile (5 to 10 mL), chloro compound (1.5 to 2 equiv), triethyl amine (2 equiv) were added at rt. The resulting mixture was stirred at rt to 60° C. for 16 h. It was diluted with water (15 mL) and extracted with EtOAc (2×20 mL). The organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under reduced pressure. The resulting crude product was purified by flash chromatography to afford the desired product

Intermediates Synthesis

Intermediate 1: 5-(1-Chloroethyl)benzo[d][1,3]dioxole

(113) ##STR00018##

Step 1: 1-(Benzo[d][1,3]dioxol-5-yl)ethan-1-ol

(114) To a stirred solution of 3, 4-methylenedioxy acetophenone (4.5 g, 27 mmol, Alfa aesar) in dry MeOH (50 mL), NaBH.sub.4 (1.08 g, 42 mmol, Loba chemie) was added slowly at 0° C. The reaction mixture was stirred at room temperature for 1 h. Then the reaction mixture was concentrated under vacuum and diluted with DCM. The DCM layer was washed with water, brine and dried over anhydrous Na.sub.2SO.sub.4, The solvent was removed under reduced pressure and resulting crude alcohol was used as such in the next step Yield: 90% (4.0 g, colorless liquid). .sup.1H NMR (400 MHz, CDCl.sub.3): δ 6.89 (s, 1H), 6.89-6.75 (m, 2H), 5.95 (s, 2H), 4.81 (t, J=8.0 Hz, 1H), 1.46 (d, J=8.0 Hz, 3H). LCMS: (Method B) 149.0 (Hydroxy elimination mass), Rt. 2.51 min, 98.6% (Max). HPLC: (Method A) Rt. 2.499 min, 99.5% (Max)

Step 2: 5-(1-Chloroethyl)benzo[d][1,3]dioxole

(115) The title compound was synthesized by following general procedure B. It was used for next step without further purification. Yield: 72% (1.2 g, colorless liquid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.06 (d, J=4.0 Hz, 1H), 6.93 (d, J=8.0 Hz, 1H), 6.86 (d, J=8.0 Hz, 1H), 6.01 (s, 2H), 2.49 (q, J=8.0 Hz, 1H), 1.74 (d, J=8.0 Hz, 3H). LCMS: (Method B) 149.0 (Cl-Elimination mass), Rt. 3.71 min, 80.15% (Max).

Intermediate 2: 1-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazine hydrochloride

(116) ##STR00019##

Step 1: tert-butyl 4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazine-1-carboxylate

(117) The title compound was synthesized following general procedure D, starting with intermediate 1 and N-boc piperazine. The crude product was purified by flash chromatography, affording the title compound (yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.85-6.82 (m, 2H), 6.74-6.71 (m, 1H), 5.98 (m, 2H), 3.37-3.36 (m, 1H), 3.27 (br. s, 4H), 2.28-2.21 (m, 4H), 1.37 (s, 9H), 1.25 (d, 3H, J=6.8 Hz). LCMS: (Method A) 335.2 (M+H), Rt. 3.10 min, 93.15% (Max). HPLC: (Method A) Rt. 3.12 min, 95.01% (Max).

Step 2: 1-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazine hydrochloride

(118) To a stirred solution of tert-butyl 4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazine-1-carboxylate (1.8 g, 5.38 mmol) in dry dioxane (10 mL), HCl in dioxane (10 mL, 4 M, Spectrochem) was added at rt and stirred for 2 h at same temperature. The reaction mixture was concentrated under vacuum and the resulting crude product was washed with diethyl ether to afford the title product as hydrochloride salt. Yield: 82% (1.2 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 12.29 (s, 1H), 7.34 (s, 1H), 7.08 (d, 1H, J=7.7 Hz), 7.00 (d, 1H, J=7.9 Hz), 6.07 (s, 2H), 4.54 (br. s, 1H), 3.81 (br. s, 1H), 3.49-3.42 (m, 3H), 3.33 (br. s, 2H), 3.12 (br. s, 1H), 2.99 (br. s, 1H), 1.67 (d, 3H, J=5.7 Hz). LCMS: (Method A) 235.0 (M+H), Rt. 1.65 min, 98.08% (Max). HPLC: (Method A) Rt. 1 56 min, 99.86% (Max).

Intermediate 3: 6-(1-chloroethyl)-2,3-dihydrobenzo[b][1,4]dioxine

(119) ##STR00020##

Step 1: 1-(2, 3-dihydrobenzo[b][1,4]dioxin-6-yl)ethan-1-01

(120) The title compound was synthesized with same protocol as described for Intermediate 1, Step 1, using 1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethan-1-one (2.0 g, 11.2 mmol) and NaBH.sub.4 (0.49 g, 13 mmol). The resulting crude alcohol was used as such in the next step. Yield: 99% (2.0 g, colorless liquid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.80 (s, 1H), 6.79-6.76 (m, 2H), 4.59 (q, J=5.6 Hz, 1H), 4.20 (s, 4H), 1.26 (d, J=5.6 Hz, 31-1). LCMS: (Method B) 163.0 (Hydroxy elimination mass), Rt. 2.51 min, 99.4% (Max).

Step 2: 6-(1-chloroethyl)-2,3-dihydrobenzo[b][1,4]dioxine

(121) The title compound was synthesized according to the general procedure B. It was used in the next step without further purification. Yield: 90% (2.2 g, brown liquid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.97 (s, 1H), 6.96-6.92 (m, 1H), 6.84-6.82 (m, 1H), 5.26 (t, J=6.7 Hz, 1H), 4.23 (s, 4H), 1.75 (d, J=6.7 Hz, 31-1). LCMS: (Method A) 163.0 (Cl-Elimination mass), Rt, 3.66 min, 95.3% (Max).

Intermediate 4: 1-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl]piperazine hydrochloride

(122) ##STR00021##

Step 1: t-Butyl 4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazine-1-carboxylate

(123) The title compound was synthesized according to the general procedure D, starting with Intermediate 3 (5 g, 25.2 mmol) and N-boc piperazine (3.96 g, 21.2 mmol). The crude product was purified by flash chromatography, affording the title compound. Yield: 52% (4.6 g, brown liquid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.80-6.71 (m, 3H), 4.21 (s, 5H), 3.34-3.26 (m, 4H), 2.27-2.24 (m, 4H), 1.37 (s, 9H), 1.23 (d, J=6.7 Hz, 3H). LCMS: (Method A) 349.2 (M+H), Rt. 3.19 min, 80.9% (Max).

Step 2: 1-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazine hydrochloride

(124) To a stirred solution of tert-butyl 4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazine-1-carboxylate (4.6 g, 13.20 mmol) in dry dioxane (5.0 mL), HCl in dioxane (10.0 mL, 4 M, Spectrochem) was added at 0° C. The reaction mixture was stirred at rt for 2 h. The completion of the reaction was monitored by TLC. The reaction mixture was concentrated. Diethyl ether was added and was evaporated again, affording the title compound. Yield: 89% (3.8 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 12.08 (br. s, 1H), 9.48-9.18 (m, 2H), 7.18 (s, 1H), 7.03 (s, 1H), 6.92 (d, J=10.6 Hz, 1H), 4.49 (s, 1H), 4.24 (s, 4H), 3.41-3.15 (m, 4H), 2.91-2.71 (m, 4H), 1.64 (s, 3H). LCMS: (Method A) 249.2 (M+H), Rt. 1.64 min, 92.6% (Max).

Intermediate 7: N-(5-piperazin-1-yl)-1,3,4-thiadiazol-2-yl)acetamide hydrochloride

(125) ##STR00022##

Step 1: tert-Butyl 4-(5-amino-1,3,4-thiadiazol-2-yl)piperazine-1-carboxylate

(126) To a stirred solution of 2-amino 5-bromo-1,3,4-thiadiazole (10.0 g, 55.5 mmol) in dry DMF (100 mL), K.sub.2CO.sub.3 (15.3 g, 111.1 mmol) and 1-boc piperazine (12.4 g, 66.65 mmol) were added at 0° C. The reaction mixture was stirred overnight at BO ° C. The reaction mixture was concentrated under vacuum. To the resulting crude solids, DCM (200 mL) was added. The DCM layer was washed with water (100 mL), brine (100 mL) and, dried over anhydrous Na.sub.2SO.sub.4 and concentrated The crude product was purified by silica gel column chromatography to afford the title compound. Yield: 76% (12 g, pale brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.51 (s, 2H), 3.39 (d, J=6.9 Hz, 4H), 3.19 (d, J=7.7 Hz, 4H), 1.39 (s, 9H) LCMS: (Method A) 286.1 (M+H), Rt. 2.71 min, 97.6% (Max).

Step 2: tert-Butyl 4-(5-acetamido-1,3,4-thiadiazol-2-yl)piperazine-1-carboxylate

(127) To a stirred solution of tert-butyl 4-(5-amino-1,3,4-thiadiazol-2-yl)piperazine-1-carboxylate (12.0 g, 42.09 mmol) in pyridine (120 mL), acetic anhydride (5.1 g, 50.5 mmol) was added at 0° C. The reaction mixture was stirred overnight at 50° C. The reaction mixture was concentrated under vacuum and triturated with diethyl ether (100 mL). The solid obtained was filtered, washed with diethyl ether (20 mL), dried and taken for next step without any further purification. Yield: 87% (12 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 12.07 (br. s, 1H), 3.45-3.34 (m, 8H), 2.11 (s, 3H), 1.42 (s, 9H). LCMS: (Method A) 328.0 (M+H), Rt 3.11 min, 86.3% (Max).

Step 3: N-(5-(Piperazin-1-0)-1,3,4-thiadiazol-2-yl)acetamide hydrochloride

(128) To a stirred solution of tert-butyl 4-(5-acetamido-1,3,4-thiadiazol-2-yl)piperazine-1-carboxylate (12.0 g) in dry dioxane (100 mL), HCl in dioxane (100 mL, 4 N) was added and the reaction mixture was stirred at rt for 3 h. The reaction mixture was concentrated under vacuum and the resulting crude product was suspended diethyl ether (50 mL). The title compound was obtained after evaporation of the solvent. Yield: 93% (9 g, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 12.07 (br. s, 1H), 3.67 (s, 4H), 3.21 (s, 4H), 2.13 (s, 3H). LCMS: (Method A) 228.0 (M+H), Rt. 0.71 min, 85.3% (Max)

Intermediate 8: Ethyl 2-(piperazin-1-yl)thiazole-5-carboxylate hydrochloride

(129) ##STR00023##

Step 1: Ethyl 2-(4-(tert-butoxycarbonyl)piperazin-1-yl)thiazole-5-carboxylate

(130) To a stirred solution of ethyl 2-bromothiazole-5-carboxylate (4.0 g, 17.0 mmol) in dry DMF (40 mL), triethylamine (7.3 mL, 51.0 mmol, Spectrochem), followed by N-Boc piperazine (3.6 g, 19.0 mmol, GLRscientific) were added. The resulting mixture was heated at 90° C. for 12 h. It was then concentrated, diluted with DCM (200 mL), washed with water (100 mL) and dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by flash chromatography (3% methanol in DCM) to afford the title compound. Yield: 77% (4.5 g, white solid). LCMS: (Method A) 342.0 (M+H). Rt. 4.42 min, 99.5% (Max). .sup.1H NMR (400 MHz, CDCl.sub.3): δ 7.88 (s, 1H), 4.30 (q, J=7.2 Hz, 2H), 3.57 (s, 8H), 1.49 (s, 9H), 1.35 (t. J=7.2 Hz, 3H).

Step 2: Ethyl 2-(piperazin-1-yl)thiazole-5-carboxylate hydrochloride

(131) To a stirred solution of ethyl 2-(4-(tert-butoxycarbonyl)piperazin-1-yl)thiazole-5-carboxylate (4.5 g, 13.0 mmol) in dry dioxane (20 mL), HCl in dioxane (4 N, 50 mL) was added at 0° C. and the reaction mixture was stirred at rt for 2 h. The reaction mixture was concentrated and the resulting solid was washed with diethyl ether and dried under vacuum. Yield: 90% (5.4 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6), δ 9.32 (s, 2H), 7.88 (s, 1H), 4.21 (q, J=9.4 Hz, 2H), 3.96-3.73 (m, 4H), 3.55-2.41 (m, 4H), 1.24 (t, J=7.0 Hz, 3H). LCMS: (Method B) 242.0 (M+H), Rt. 2.11 min, 99.8% (Max).

Intermediate 10: N-(2-(piperazin-1-yl)pyrimidin-5-yl)acetamide, hydrochloride

(132) ##STR00024##

Step 1: Tert-butyl 4-(5-nitropyrimidin-2-yl)piperazine-1-carboxylate

(133) To a stirred solution of 2-chloro-5-nitro-pyrimidine (2.2 g, 13.7 mmol) in dry DMF (25 mL), triethylamine (5.7 mL, 41.3 mmol, Spectrochem) followed by N-Boc piperazine (2.8 g, 15.7 mmol) were added and the resulting mixture was heated at 90° C. for 12 h. It was concentrated and the residue was diluted with DCM (50 mL), washed with water (15 mL) and dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was washed with ACN with 5% methanol to afford the title compound (brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.12 (s, 2H), 3.92-3.88 (m, 4H), 3.45-3.42 (m, 4H), 1.4 (s, 9H). LCMS: (Method A) 254.0 (M-(t-butyl)+H), Rt. 4.43 min. 98.03% (Max).

Step 2: Tert-butyl 4-(5-aminopyrimidin-2-yl)piperazine-1-carboxylate

(134) To a stirred solution of tert-butyl 4-(5-nitropyrimidin-2-yl)piperazine-1-carboxylate (2.1 g, 6.79 mmol) in methanol (25 mL), Pd/C (10%, 0.210 g, Aldrich) was added and the reaction mixture was stirred under H.sub.2 atmosphere for 3 h. The reaction completion was monitored by TLC. The reaction mixture was filtered through celite and evaporated under vacuum. The crude product was used without further purification. Yield: 95% (1.8 g, pale brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.88 (s, 2H), 4.62 (s, 2H), 3.48-3.45 (m, 4H), 3.35-3.28 (m, 4H), 1.33 (s, 9H). LCMS: (Method A) 280 (M+H), Rt. 2.66 min, 98.82% (Max).

Step 3: Tert-butyl 4-(5-acetamidopyrimidin-2-yl)piperazine-1-carboxylate

(135) To a stirred solution of tert-butyl 4-(5-aminopyrimidin-2-yl)piperazine-1-carboxylate (1,8 g, 6.44 mmol) in dry DCM (18 mL), pyridine (0.7 mL, 9.67 mmol, spectrochem), acetic anhydride (0.9 mL, 9.67 mmol, spectrochem) and dimethyl aminopyridine (0.036 g, 2%, spectrochem) were added. The resulting mixture was stirred at rt for 12 h. The reaction mixture was concentrated under reduced pressure and the resulting solid was suspended in HCl (1.5 N in water, 15 mL). The solid was filtered and washed with water (200 mL) to afford the title compound. Yield: 87% (1.8 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.85 (s, 1H), 8.51 (s, 2H), 3.66-3.61 (m, 4H), 3.33-3.31 (m, 4H), 2.00 (s, 3H), 1.41 (s, 9H). LCMS: (Method A) 322 (M+H), Rt, 3.1 min, 98.4% (Max).

Step 4: N-(2-(piperazin-1-yl)pyrimidin-5-yl)acetamide

(136) To a stirred solution of tert-butyl 4-(5-acetamidopyrimidin-2-yl)piperazine-1-carboxylate (1.8 g, 5.6 mmol) in dry dioxane (5 mL) at 0° C., a solution of HCl in dioxane (4 N, 15 mL) was added and the reaction mixture was stirred 3 h at rt. It was concentrated and the resulting product washed with diethyl ether, affording the title compound. Yield: 83% (1.8 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 10.9 (s, 1H), 9,92 (s, 1H), 8.86 (s, 2H), 3.22-3.17 (m, 4H), 3.02-2.78 (m, 4H), 2.06 (s, 3H). LCMS: (Method B) 222.0 (M+H), Rt. 2.36 min, 95.34% (Max)

Intermediate 16: (S)-1-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazine hydrochloride

(137) ##STR00025##

Step 1: (R)—N-(1-(benzo[d][1,3]dioxol-5-yl)ethylidene)-2-methylpropane-2-sulfinamide

(138) To a mixture of 1-(benzo[d][1,3]dioxol-5-yl)ethan-1-one (105.7 g, 644.6 mmol), (R)-(+)-2-methyl-2-propanesulfinamide (85.79 g, 709 mmol) in THE (1.0 L), titanium(IV) ethoxide (294.06 g, 1289.2 mmol) was added at rt over 30 min and refluxed for 35 h. The reaction was monitored by HPLC. The reaction mixture was cooled to rt and slowly quenched with water (500 mL). The precipitate observed was filtered through celite bed (100 g) and washed with EtOAc (2.0 L). The organic layer was washed with water (500 mL), brine solution (300 mL) and dried over Na.sub.2SO.sub.4, (100 g) and evaporated under vacuum at 50° C. The resulting crude product was codistilled with toluene (2×500 mL) and used as such for next step without any further purification (164 g, brown liquid). LCMS: (Method A) 268.0 (M+H), Rt. 3.87 min, 83.05% (Max).

(139) HPLC: (Method A) Rt. 3.81 min, 57.62% (Max).

Step 2: (R)—N—((S)-1-(benzo[d])[1,3]dioxol-5-yl)ethyl)-2-methylpropane-2-sulfinamide

(140) To a stirred solution of (R)—N-(1-(benzo[d][1,3]dioxol-5-yl)ethylidene)-2-methylpropane-2-sulfinamide (96 g, 359 mmol) in THE (960 mL), L-Selectride (539 mL, 539 mmol, 1 M solution in THF) was added under nitrogen atmosphere at −50° C. over 30 min and stirred for 1 h. The completion of the reaction was confirmed by TLC, The reaction mixture was quenched with methanol (150 mL), water (750 mL) and stirred overnight at rt. The aqueous layer was extracted with EtOAc (2×300 mL). The combined organic layer was washed with sat. NH.sub.4Cl (2×250 mL), brine (250 mL), dried over Na.sub.2SO.sub.4 and evaporated under vacuum at 50° C. The resulting crude product (as light brown thick oil) was diluted with pet ether (250 mL) and stirred at −20° C. for 30 min. The resulting precipitate was filtered and washed with pet ether (2×100 mL). It was dried under vacuum to give the title compound. Yield: 70.2% (68 g, Off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.89 (s, 1H), 6.83-6.77 (m, 2H), 5.99-5.95 (m, 2H), 5.25 (d, J=5.2 Hz, 1H), 4.30 (q, J=6.0 Hz, 1H), 1.39 (d, J=1.6 Hz, 3H), 1.11-1.06 (m, 9H). LCMS: (Method A) 270.0 (M+H), Rt. 3.66 min, 99.65% (Max). HPLC: (Method A) Rt. 3.62 min, 99.69% (Max). Chiral HPLC: (Method C) Rt. 9.71 min, 100%.

Step 3: (S)-1-(benzo[d][1,3]dioxol-5-yl)ethan-1-amine

(141) To a stirred solution of (R.sub.S)—N—((S)-1-(benzo[d][1,3]dioxol-5-yl)ethyl)-2-methylpropane-2-sulfinamide (68 g, 252 mmol) in MeOH (680 mL), thionyl chloride (74.3 g, 630 mmol) was added at 0° C. over 15 min and the resulting mixture was stirred at rt for 1 h. The completion of the reaction was confirmed by TLC. The reaction mixture was concentrated under vacuum at 50° C. The resulting residue was suspended in EtOAc (300 mL), filtered and washed with EtOAc (150 mL). The product was basified with 30% aqueous ammonia solution (300 mL) and extracted with EtOAc (2×250 mL). The combined organic layer was washed with brine solution (1×150 mL) and dried over Na.sub.2SO.sub.4. The solvent was evaporated at under vacuum to give the title compound. Yield: 92.84% (38.3 g, brown liquid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6,95 (s, 1H), 6.81-6.77 (m, 2H), 5.95 (s, 2H), 3.90 (q, J=6.56 Hz, 1H), 1.85 (s, 2H), 1.19 (m, J=6.56 Hz, 3H). LCMS: (Method A) 149.0 (M−16), Rt. 1.65 min, 99.56% (Max). HPLC: (Method A) Rt. 1.60 min, 99.61% (Max). Chiral HPLC: (Method B) Rt 11.11 min, 100%.

Step 4: (S)-1-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)-4-tosylpiperazine

(142) To a stirred solution of (S)-1-(benzo[d][1,3]dioxol-5-yl)ethan-1-amine (41 g, 248 mmol) in DIPEA (86.6 mL, 496 mmol), N,N-bis(2-chloroethyl)-p-toluene sulfonamide (80.74 g, 273 mmol) was added at rt and the resulting mixture was heated at 105° C. overnight. The completion of the reaction was confirmed by TLC and the reaction mixture was diluted with water (1000 mL) and extracted with EtOAc (2×500 mL). The combined organic layer was washed with water (200 mL), brine solution (200 mL) and dried over Na.sub.2SO.sub.4. After evaporation of the solvent, the resulting crude solid was suspended in pet ether (350 mL) and stirred for 10 min at rt. The suspension was filtered and was washed with Et.sub.2O (2×200 mL) and dried under vacuum to give the title compound.

(143) Yield: 63.2% (61 g, Off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.59 (d, J=8.2 Hz, 2H), 7.45 (d, J=8.2 Hz, 2H), 6.81-6.77 (m, 1H), 6.69 (d, J=7.4 Hz, 1H), 5.96 (s, 2H), 3.32 (q, J=7.76 Hz, 1H), 2.81-2.80 (m, 4H), 2.42 (s, 3H), 2.36-2.32 (m, 4H), 1.18 (d, J=6.4 Hz, 3H). LCMS: (Method A) 389.2 (M+H), Rt. 3.40 min, 98.09% (Max). HPLC: (Method A) Rt. 3.30 min, 98.69% (Max). Chiral HPLC: (Method D) Rt. 15.79 min, 100.00%

Step 5: (S)-1-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazine hydrochloride

(144) To a mixture of (S)-1-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)-4-tosylpiperazine (61 g, 157 mmol) and 4-hydroxy benzoic acid (65.01 g, 471 mmol), HBr in acetic acid (244 mL) was added at 0° C. and the reaction mixture was stirred at rt overnight. The completion of the reaction was confirmed by TLC. The reaction mixture was diluted with water (400 mL). The precipitate was filtered through celite bed and washed with water (200 mL). The aqueous filterate was washed with EtOAc (4×300 mL) and basified up to pH 11 with NaOH pellet (30 g) at 0° C. (during basification the colour of aqueous was converted to light back). The product was extracted with EtOAc (4×300 mL). The combined organic layer was dried over Na.sub.2SO.sub.4 and evaporated under vacuum. The resulting light black oil was diluted in 1,4 Dioxane (50 mL) and cooled to 0° C. and 4.5 N HCl solution in dioxane (100 mL) was added and stirred for 15 min at rt. The solvent was evaporated at 45° C. under reduced pressure to get the title compound (pale brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 12.11 (s, 1H), 7.32 (s, 1H), 7.06-6.99 (m, 2H), 6.07 (s, 2H), 4.55-4.52 (m, 1H), 3.80-3.61 (m, 2H), 3.05-2.95 (m, 2H), 2.51-2.50 (m, 4H), 1.68 (s, 3H). LCMS: (Method A) 235.3 (M+H), Rt. 1.53 min, 95.85% (Max). HPLC: (Method A) Rt. 1.52 min, 95.06% (Max). Chiral HPLC: (Method A) Rt. 8.11 min, 100%

Intermediate 21: 6-(1-chloroethyl-2,3-dihydrobenzofuran

(145) ##STR00026##

Step 1: 1-(2,3-dihydrobenzofuran-6-yl)ethan-1-one

(146) The title compound was prepared according to the procedure described for Intermediate 6, Step 1, using 6-bromo-2,3-dihydro-1-benzofuran (1 g, 5.03 mmol) as starting material. The crude product was purified by flash chromatography to give the title compound. Yield: 73.7% (0.6 g, pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): b 7.48 (d, J=7.64 Hz, 1H), 7.37-7.35 (d, J=7.68 Hz, 1H), 7.26 (s, 1H), 4.58 (t, J=8.76 Hz, 2H), 3.24 (t, J=8.76 Hz, 2H), 2.53 (s, 3H). LCMS: (Method A) 163.2 (M+H), Rt. 3.01 min, 97.60% (Max).

Step 2: 1-(2,3-dihydrobenzofuran-6-yl)ethan-1-ol

(147) The title compound was prepared according to the procedure described for Intermediate 17, Step 2, using 1-(2,3-dihydrobenzofuran-6-yl)ethan-1-one (0.6 g, 3.7 mmol) as starting material. After evaporation of the solvent, the title compound was isolated and used without further purification. Yield: 88.30% (0.53 g, colourless liquid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.11 (d, J=7.6 Hz, 1H), 6.77-6.75 (m, 1H), 6.71 (s, 1H), 5.04 (d, J=4.4 Hz, 1H), 4.63-4.61 (m, 1H), 4.48 (t, J=8.8 Hz, 2H), 3.11 (t, J=8.8 Hz, 2H), 1.25 (d, J=6.4 Hz, 3H). LCMS: (Method A) 147.0 (M−17H), Rt. 2.64 min, 89.95% (Max).

Step 3: 6-(1-chloroethyl)-2,3-dihydrobenzofuran

(148) The title compound was synthesized from 1-(2,3-dihydrobenzofuran-6-yl)ethan-1-ol (0.53 g, 3.23 mmol), according to the general procedure B. The crude product was used in the next step without further purification. Yield: quantitative (0.58 g, brown oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.20 (d, J=7.56 Hz, 1H), 6.93-6.91 (m, 1H), 6.87 (s, 1H), 5.29-5.24 (m, 1H), 4.53 (t, J=8.72 Hz, 2H), 3.15 (t, J=8.76 Hz, 2H), 1.75 (d, J=6.76 Hz, 3H). LCMS: (Method A) 147.0 (M−35H), Rt. 3.76 min, 83.62% (Max).

Intermediate 25: 2-(piperazin-1-yl)-6,7-dihydrothiazolo[5,4-c]pyridin-4(5H)-one dihydrochloride

(149) ##STR00027##

Step 1 tert-butyl 3-bromo-2,4-dioxopiperidine-1-carboxylate

(150) To a stirred solution of tert-butyl 2,4-dioxopiperidine-1-carboxylate (1 g, 4.69 mmol) in dry CCl.sub.4 (10 mL), N-bromosuccinimide (0.83 g, 4.69 mmol) was added at 10° C. The reaction mixture was stirred at 10-15° C. for 2 h. It was then evaporated under reduced pressure. Water (10 mL) was added and the desired product was extracted with EtOAc (2×30 mL). The combined organic layer was dried over Na.sub.2SO.sub.4 and concentrated. The resulting crude product was purified by flash column chromatography, affording the title product. Yield: 99% (1.4 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 5.50 (s, 1H), 3.74-3.71 (m, 2H), 2.69-2.66 (m, 2H), 1.46 (s, 9H). LCMS: (Method A) 193.8 (M-Boc+H), Rt. 2.93 min, 81.51% (Max).

Step 2: tert-butyl-2-(4-(tert-butoxycarbonyl)piperazin-1-yl)-4-oxo-6,7-dihydrothiazolo[5,4-c]pyridine-5(4H)-carboxylate

(151) To a stirred solution of tert-butyl 4-carbamothioylpiperazine-1-carboxylate (synthesized according to Example 5, Step 1, 1.31 g, 5.36 mmol) in isopropanol (15 mL), tert-butyl 3-bromo-2,4-dioxopiperidine-1-carboxylate obtained in the first step (1.3 g, 4.46 mmol) was added at rt. The reaction mixture was stirred overnight at 90° C. It was cooled down to rt and evaporated under reduced pressure. Water (10 mL) was added and the desired product was extracted with diethyl ether (2×30 mL), dried over Na.sub.2SO.sub.4 and concentrated, affording the title product. Yield: 74% (1.42 g, yellow solid). LCMS: (Method A) 239.0 (M-Boc+H), Rt. 0.70 min, 48.39% (Max).

Step 3: 2-(piperazin-1-yl)-6,7-dihydrothiazolo[5,4-c]pyridin-4(5H)-one dihydrochloride

(152) To a stirred solution of tert-butyl-2-(4-(tert-butoxycarbonyl)piperazin-1-yl)-4-oxo-6,7-dihydrothiazolo[5,4-c]pyridine-5(4H)-carboxylate obtained in previous step (1.3 g, 2.96 mmol) in 1,4-dioxane (10 mL), HCl in dioxane (4 M solution, 13 mL, 10 V) was added at 0° C. The reaction mixture was stirred for 2 h at rt. It was evaporated and DCM (15 mL) was added and evaporated. This procedure was repeated twice, affording the title product which was used without any further purification. Yield: 99% (0.82 g. off white solid).

Intermediate 29: 1-(3-(Trifluoromethyl)pyridin-2-yl)piperazine

(153) ##STR00028##

(154) To a stirred solution of 2-chloro-3-(trifluoromethyl)pyridine (1 g, 5.50 mmol) in n-Butanol (10 mL), 1-piperazine (6.63 g, 77.12 mmol) was added and the reaction mixture was stirred at 100° C. for 24 h. The reaction completion was confirmed by TLC. The reaction mixture was cooled to room temperature and concentrated under reduced pressure. The resulting mixture was diluted with ethyl acetate (30 mL) and neutralized with saturated sodium bicarbonate solution (4 mL), and extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under reduced pressure. The crude was purified by column chromatography to afford the title compound. Yield: 63% (0.8 g, colorless gum). .sup.1HNMR (400 MHz, DMSO-d.sub.6): δ 8.50 (d, J=3.6 Hz, 1H), 8.03 (dd, J=7.8, 2.0 Hz, 1H), 7.16-7.13 (m, 1H), 3.11-3.08 (m, 4H), 2.81-2.79 (m, 4H). LCMS: (Method F) 232.0 (M+H), Rt. 2.10 min, 96.01% (Max).

Intermediate 30: 1-(1-(2,3-dihydrobenzofuran-6-yl)ethyl)piperazine, hydrochloride

(155) ##STR00029##

Step 1: tert-butyl 4-(1-(2,3-dihydrobenzofuran-6-yl)ethyl)piperazine-1-carboxylate

(156) To a stirred solution of N-boc piperazine (5.5 g, 29.5 mmol), TEA (11.9 g, 11.8 mmol) in DMF (55 mL), Intermediate 21 (7.5 g, 41.3 mmol) was added at RT and the resulting mixture was heated at 70° C. overnight. Completion of the reaction was monitored by TLC. The reaction mixture was concentrated under reduced pressure and the resulting crude mixture was dissolved in EtOAc (100 mL). The organic layer was washed with water (50 mL), brine (50 mL), dried over Na.sub.2SO.sub.4 and concentrated. The crude product was purified by flash chromatography (12% EtOAc in pet ether as eluent) to give the title compound. Yield: 52% (58% purity) (5.1 g, brown gum). .sup.1H NMR (400 MHz, CDCl.sub.3): δ 7.19-7.12 (m, 1H), 6.88-6.77 (m, 2H), 4.62-4.59 (m, 2H), 3.42-3.39 (m, 4H), 3.36-3.31 (m, 1H), 3.23-3.18 (m, 2H), 2.44-2.34 (m, 4H), 1.46 (s, 9H), 1.35 (d, J=6.4 Hz, 3H). LCMS: (Method A) 333.3 (M+H), Rt. 3.12 min, 58.09% (Max).

Step 2: 1-(1-(2,3-dihydrobenzofuran-6-yl)ethyl)piperazine, hydrochloride

(157) To a stirred solution of tert-butyl 4-(1-(2,3-dihydrobenzofuran-6-yl)ethyl)piperazine-1-carboxylate (5.1 g, 15.3 mmol) in 1,4 dioxane (25 mL), HCl solution in dioxane (4 M, 25 mL) was added at 0° C. The resulting mixture was stirred at rt for 2 h. Completion of the reaction was monitored by TLC. The reaction mixture was evaporated at 40° C. under reduced pressure. The resulting product was triturated with n-hexanes (2×100 mL) and decanted two times. It was then dried at 40° C. under reduced pressure to give the title compound. Yield: 66.2% (3.1 g, Off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.15 (d, J=7.2 Hz, 1H), 6.76-6.71 (m, 2H), 4.36-4.30 (m, 2H), 3.55-3.53 (m, 4H), 3.43-3.41 (m, 1H), 3.15-3.11 (m, 2H), 2.53-2.43 (m, 4H), 1.31-1.29 (m, 3H). LCMS: (Method A) 233.2 (M+H), Rt. 1.67 min, 90.31% (Max), 0.38

Example 5: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethylpiperazin-1-yl)-4-phenylthiazole

(158) ##STR00030##

Step 1: tert-butyl 4-carbamothioylpiperazine-1-carboxylate

(159) To a solution of 1-boc piperazine (5.0 g, 26.88 mmol) in dry THE (50 mL), 1,1-thio carbonylimidazole (5.48 g, 29.56 mmol) was added at room temperature and stirred for 2 h. The reaction mixture was heated at 50° C. for 1 h. It was cooled down to 0° C. and methanolic ammonia solution (50 mL, 7 N) was added. The mixture was stirred at 60° C. for 20 h. It was then diluted with water and extracted with EtOAc. The organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The crude product was purified by flash chromatography to give the title compound. Yield: 92% (4.0 g, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6); b 9.2 (m, 2H), 3.16-3.14 (m, 2H), 2.49-2.48 (m, 6H), 1.30 (s, 9H). LCMS: (Method A) 246.2 (M+H), Rt. 2.93 min, 95.3% (Max).

Step 2: tert-Butyl 4-(4-phenylthiazol-2-yl)piperazine-1-carboxylate

(160) To a stirred solution of tert-butyl 4-carbamothioylpiperazine-1-carboxylate (0.5 g, 2.08 mmol) in dioxane (10 mL), triethyl amine (0.22 mL, 2.6 mmol) and 2-bromo-1-phenylethan-1-one (0.52 g, 2.6 mmol) were added at rt. The resulting mixture was stirred at 90° C. for 20 h. The completion of the reaction was monitored by TLC. It was diluted with water and extracted with EtOAc. The organic layer was separated, dried over anhydrous Na.sub.2SO.sub.4, concentrated under vacuum. The resulting crude product was taken as such for the next step. Yield: 86% (0.5 g, colorless liquid).

Step 3: 4-Phenyl-2-(piperazin-1-yl)thiazole hydrochloride

(161) To a stirred solution of tert-butyl 4-(4-phenylthiazol-2-yl)piperazine-1-carboxylate (0.5 g) in dry dioxane (2 mL), HCl in dioxane (10 mL, 4 N) was added at room temperature and stirred for 3 h at same temperature. The reaction mixture was concentrated under reduced pressure and the resulting crude product was suspended in diethyl ether (10 mL). It was filtered and dried under vacuum to afford the title compound. Yield: 75% (350 mg, yellow solid). LCMS: (Method A) 246.2 (M+H), Rt. 2.85 min, 71.5% (Max).

Step 4: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-phenylthiazole

(162) The title compound was synthesized by following general procedure E, using 4-phenyl-2-(piperazin-1-yl)thiazole hydrochloride (0.2 g, 0.8 mmol) and Intermediate 1 (0.3 g, 1.6 mmol). The reaction mixture was stirred at rt for 16 h. The crude product was purified by flash chromatography, affording the title compound (yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.84-7.82 (m, 2H), 7.40-7.36 (m, 3H), 7.30-726 (m, 1H), 7.14-6.99 (m, 31-3), 6.06 (s, 2H), 4.61-4.48 (m, 1H), 4.18-3.98 (m, 2H), 3.43-3.33 (m, 2H) 3.12-2.98 (m, 2H), 2.59-2.49 (m, 2H), 1.63 (br. s, 3H). LCMS: (Method A) 394.0 (M+H) Rt. 3.87 min, 98.3% (Max). HPLC: (Method A) Rt. 3.89 min, 99.3% (Max).

Example 6: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-(4-methoxyphenyl)thiazole

(163) ##STR00031##

Step 1: tert-butyl 4-(4-(4-methoxyphenyl)thiazol-2-yl)piperazine-1-carboxylate

(164) To a stirred solution of tert-butyl 4-carbamothioylpiperazine-1-carboxylate (synthesized according to Example 5, Step 1, 1.0 g, 4.0 mmol) in dioxane (20 mL), triethyl amine (0.6 mL, 8.3 mmol) and 2-bromo-1-(4-methoxyphenyl)ethan-1-one (1.2 g, 5.3 mmol) was added at rt and stirred at 90° C. for 20 h. The completion of the reaction was monitored by TLC. The reaction mixture was diluted with water (10 mL) and extracted with EtOAc (2×25 mL). The organic layer was separated, dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvents, the resulting crude product was taken as such for the next step. Yield: 53% (0.8 g, pale yellow liquid).

Step 2: 4-(4-Methoxyphenyl)-2-(piperazin-1-yl)thiazole hydrochloride

(165) To a stirred solution of tert-butyl 4-(4-(4-methoxyphenyl)thiazol-2-yl)piperazine-1-carboxylate (0.8 g) in dry dioxane (5 mL), HCl in dioxane (4 M, 10 ml) was added at rt and stirred for 3 h. The reaction mixture was concentrated under vacuum. The resulting crude product was triturated in diethyl ether (10 mL), filtrated and dried under vacuum to afford the title compound. Yield: 68% (400 mg, yellow solid). LCMS: (Method A) 276.0 (M+H), Rt. 2.82 min, 69.9% (Max).

Step 3: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-(4-methoxyphenyl)thiazole

(166) The title compound was synthesized by following general procedure E, using 4-(4 methoxyphenyl)-2-(piperazin-1-yl)thiazole hydrochloride (0.5 g, 2.7 mmol) and Intermediate 1 (0.9 g, 5.4 mmol). The reaction mixture was stirred at rt for 16 h. The crude product was purified by flash chromatography, affording the title compound (pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.76 (d, J=8.4 Hz, 2H), 7.07 (s, 1H), 6.94-6.91 (m, 3H), 6.86-6.84 (m, 1H), 6.78-6.76 (m, 1H), 5.99 (m, 2H), 3.76 (s, 3H), 3.43-3.42 (m, 5H), 2.50 (m, 2H) 2.42-2.41 (m, 2H), 1.30 (d, J=6.8 Hz, 3H). LCMS: (Method A) 424.0 (M+H), Rt, 3.86 min, 98.7% (Max), HPLC: (Method A) Rt. 3.85 min, 99.3% (Max).

Example 7: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole

(167) ##STR00032##

(168) To a stirred solution of Intermediate 2 (0.1 g, 0.37 mmol) in dry DMSO (5 mL), K.sub.2CO.sub.3 (0.15 g, 11.11 mmol) and 2-bromo thiazole (0.066 g, 0.407 mmol) were added. The reaction mixture was heated in a microwave at 150° C. for 3 h. The reaction mixture was cooled and concentrated under vacuum. The resulting crude product was purified by MD Autoprep (Method B) to afford the title compound (off white solid). .sup.1H NMR (400 MHz, CDCl.sub.3): δ 7.20 (d, J=4.0 Hz, 1H), 6.90 (s, 1H), 6.77 (s, 2H), 6.57 (s, 1H), 5.97 (s, 2H), 3.48 (s, 4H), 3.36 (s, 1H), 2.60-2.53 (m, 4H), 1.37 (s, 3H). LCMS: (Method A) 318.0 (M+H), Rt. 2.04 min, 94.4% (Max). HPLC: (Method A) Rt. 2.04 min. 98.6% (Max).

Example 9: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-methylpyrimidine

(169) ##STR00033##

(170) To a stirred solution of Intermediate 2 (0.1 g, 0.37 mmol) in dry DMF (5 mL), DIPEA (0.22 g, 1.7 mmol) and 2-chloro-4-methyl pyrimidine (0.109 g, 0.8 mmol) were added at rt and the reaction mixture was stirred at 120° C. for 12 h. It was cooled down to rt and concentrated under vacuum. The resulting crude product was purified by flash chromatography to afford the title compound (brown oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.17 (d, J=4.8 Hz, 1H), 6.89 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.76-6.74 (m, 1H), 6.48 (d, J=4.8 Hz, 1H), 5.99 (m, 2H), 3.70-3.66 (m, 4H), 3.40-3.34 (m, 1H), 2.43-2.39 (m, 2H), 2.34-2.31 (m, 2H) 2.24 (s, 3H), 1.28 (d, J=6.4 Hz, 3H). LCMS: (Method A) 327.0 (M+H), Rt. 2.57 min, 98.1% (Max). HPLC: (Method A) Rt. 2.59 min, 98.6% (Max).

Example 10: 141-(Benzo[d][1,3]dioxol-5-yl)ethyl)-4-(pyridin-2-yl)piperazine

(171) ##STR00034##

(172) The title compound was synthesized by following general procedure D, using 1-pyridyl-2-piperazine (0.2 g, 1.3 mmol) and Intermediate 1 (0.3 g, 1.63 mmol). The resulting crude product was purified by silicagel column, affording the title compound (colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.07 (dd, J=2.0, 4.8 Hz, 1H), 7.51-7.46 (m, 1H), 6.88 (s, 1H), 6.84-6.82 (m, 1H), 6.76-6.74 (m, 2H), 6.61-6.58 (m, 1H), 5.98 (m, 2H), 3.43-3.40 (m, 4H), 3.34-3.33 (m, 1H), 2.47-2.44 (m, 2H), 2.39-2.35 (m, 2H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 312.0 (M+H), Rt. 1.83 min, 98.0% (Max). HPLC: (Method A) Rt. 1.82 min, 98.4% (Max).

Example 11: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl]piperazin-1-yl)pyrimidine

(173) ##STR00035##

(174) The title compound was synthesized by following general procedure D, using 2-(piperazin-1-yl)pyrimidine (0.2 g, 1.21 mmol) and Intermediate 1 (0.366 g, 1.82 mmol). The resulting crude product was purified by MD Autoprep (Method B), affording the title compound (colourless oil). .sup.1H NMR (400 MHz, MeOH-d.sub.4): δ 8.36 (d, J=4.8 Hz, 2H), 6.96 (s, 1H), 6.90-6.84 (m, 2H), 6.66 (t, J=4.8 Hz, 1H), 5.99 (s, 2H), 3.92-3.90 (m, 4H), 3.33 (m, 1H), 2.83 (m, 4H), 1.59 (d, J=6.0 Hz, 3H). LCMS: (Method A) 313.2 (M+H), Rt. 2.45 min, 99.4% (Max). HPLC: (Method A) Rt. 2.44 min. 99.8% (Max).

Example 12: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-isopropylthiazole

(175) ##STR00036##

Step 1: t-Butyl 4-(4-isopropylthiazol-2-yl)piperazine-1-carboxylate

(176) To a stirred solution of tert-butyl 4-carbamothioylpiperazine-1-carboxylate (synthesized according to Example 5, Step 1, 1.2 g, 4.01 mmol) in THE (10 mL), triethyl amine (0.5 mL, 5.3 mmol) and 1-bromo-3-methylbutan-2-one (1.0 mL, 5.3 mmol) were added at rt The resulting mixture was stirred for 16 h at 90° C. The completion of the reaction was monitored by TLC. The reaction mixture was quenched with water and extracted with EtOAc. The organic layer was dried over anhydrous Na.sub.2SO.sub.4, concentrated under vacuum and the resulting crude product was taken as such for next step. Yield: 80% (0.8 g, pale yellow oil). LCMS: (Method A) 312.0 (M+H), Rt. 3.24 min, 95.2% (Max).

Step 2: 4-Isopropyl-2-(piperazin-1-yl)thiazole hydrochloride

(177) To a stirred solution of tert-butyl 4-(4-isopropylthiazol-2-yl)piperazine-1-carboxylate (0.8 g, 2.4 mmol) in dry dioxane (2 mL), HCl in dioxane (4 N, 10 mL) was added at rt and stirred for 2 h at same temperature. The reaction mixture was concentrated under vacuum and the crude product was washed with diethyl ether to afford the title compound. Yield: 93% (1.2 g, pale yellow oil).

Step 3: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-isopropylthiazole

(178) The title compound was synthesized by following general procedure D, using 4-isopropyl-2-(piperazin-1-yl)thiazole hydrochloride (0.57 g, 2.3 mmol) and Intermediate 1 (0.5 g, 2.3 mmol) The resulting crude product was purified by MD Autoprep (Method C), affording the title compound (pale yellow oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.89 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1 Fi), 6.33 (s, 1H), 5.98 (m, 2H), 3.41-3.11 (m, 5H), 2.74-2.72 (m, 1H), 2.46-2.38 (m, 4H), 1.27 (d, J=6.8 Hz, 3H), 1.15 (d, J=6.8 Hz, 3H). LCMS: (Method A) 360.0 (M+H), Rt. 2.71 min, 94.5% (Max). HPLC: (Method A) Rt. 2.69 min, 98.8% (Max).

Example 13: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-(trifluoromethyl)thiazole

(179) ##STR00037##

Step 1: tert-Butyl 4-(4-(trifluoromethyl)thiazol-2-yl)piperazine-1-carboxylate

(180) To a stirred solution of tert-butyl 4-carbamothioylpiperazine-1-carboxylate (synthesized according to Example 5, Step 1, 2 g, 13.75 mmol) in dioxane (20 mL), triethyl amine (1.7 mL, 12.24 mmol) and 1-bromo-3,3,3-trifluoro acetone (3.2 g, 16.5 mmol) were added and stirred at 90° C. for 3 h. The completion of the reaction was monitored by TLC. The reaction mixture was quenched with water (10 mL) and extracted with ethyl acetate (2×25 mL). The organic layer was separated, dried over anhydrous Na.sub.2SO.sub.4, concentrated under vacuum and was used as such for next step. Yield: 75% (1.0 g, white solid). .sup.1H NMR (300 MHz, DMSO-d.sub.6): δ 7.57 (s, 1H) 3.42 (m, 8H), 1.40 (s, 9H). LCMS: (Method A) 338.0 (M+H), Rt. 5.37 min, 99.0% (Max).

Step 2: 2-(Piperazin-1-yl)-4-(trifluoromethyl)thiazole hydrochloride

(181) To a stirred solution of tert-butyl 4-(4-(trifluoromethyl)thiazol-2-yl)piperazine-1-carboxylate (1.0 g, 2.93 mmol) in dry dioxane, HCl in dioxane (4 N, 15 mL) was added and the reaction mixture was stirred at rt for 1 h. The reaction mixture was concentrated under vacuum and the resulting crude product was triturated in diethyl ether, filtrated and dried under vacuum to afford the title compound. Yield: 99% (700 mg, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.22 (br. s, 2H), 7.66 (s, 1H), 3.68-3.64 (m, 4H), 3.21 (m, 4H). LCMS: (Method A) 238.0 (M+H), Rt. 2.33 min, 99.7% (Max).

Step 3: 2-(4-(1-(Benzo([d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-(trifluoromethyl)thiazole

(182) To a stirred solution of 2-(piperazin-1-yl)-4-(trifluoromethyl)thiazole hydrochloride (0.26 g, 1.07 mmol) in dry DMF (3 mL), Intermediate 1 (0.19 g, 1.07 mmol) and triethyl amine (0.272 g, 2.69 mmol) were added and the reaction mixture was stirred at 80° C. for 16 h. The reaction mixture was concentrated, the crude product was diluted with ethyl acetate (10 mL) and the organic layer was washed with brine (10 mL). The organic layer was separated, dried over anhydrous Na.sub.2SO.sub.4 and concentrated to afford the title compound (colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.96 (s, 1H), 6.88 (s, 1H), 6.76-7.75 (m, 2H), 5.91 (s, 2H), 3.55-3.45 (m, 4H), 3.38 (q, J=6.4 Hz, 1H), 2.62-2.49 (m, 4H), 2.56-2.51 (m, 4H), 1.36 (d, J=6.4 Hz, 3H). LCMS: (Method A) 386.0 (M+H), Rt. 3.55 min, 97.4% (Max). HPLC: (Method A) Rt., 3.54 min, 98.7% (Max).

Example 14: 1-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)-4-(5-methylpyridin-2-yl)piperazine

(183) ##STR00038##

(184) The title compound was synthesized according the general procedure D, using Intermediate 2 and 2-fluoro-5-methyl pyridine. The crude product was purified by flash chromatography to afford the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.92 (s, 1H), 7.36-733 (m, 1H), 6.89 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.76 (d, J=7.6 Hz, 1H), 6.70 (d, J=8.4 Hz, 1H), 5.99 (m, 2H), 3.37-3.35 (m, 5H), 2.47-2.44 (m, 2H), 2.38-2.36 (m, 2H), 2.12 (s, 3H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 326.2 (M+H), Rt. 1.96 min, 97.6% (Max), HPLC: (Method A) Rt. 1.96 min, 98.1% (Max).

Example 15: (R)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-methylthiazole or (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-methylthiazole

(185) ##STR00039##

(186) The two enantiomers of Example A were separated by chiral preparative HPLC (Method PE). The first eluting compound has Rt. 5.76 min (Method C) (colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.89 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 6.35 (s, 1H), 5.99-5.98 (m, 2H), 3.40-3.36 (m, 1H), 3.32-3.29 (m, 4H), 2.47-2.44 (m, 2H), 2.41-2.37 (m, 2H), 2.11 (s, 3H), 1.26 (d, J=6.4 Hz, 3H). LCMS: (Method A) 332.0 (M+H), Rt. 2.06 min, 96.3% (Max). HPLC: (Method A) Rt 2.05 min, 99.5% (Max), 99.4% (254 nm). HPLC chiral purity: (Method C) Rt. 5.76 min, 100% (Max). Example 15 is the second eluting compound with Rt. 7.44 min (Method C) (colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.89 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 6.35 (s, 1H), 5.99 (s, 2H), 3.42-3.37 (m, 1H), 3.32-3.30 (m, 4H), 2.47-2.44 (m, 2H), 2.40-2.36 (m, 2H), 2.11 (s, 3H), 1.26 (d, J=6.8 Hz, 3H). LCMS: (Method A) 332.0 (M+H), Rt. 2.04 min, 99.2% (Max). HPLC: (Method A) Rt. 2.05 min, 99.2% (Max). HPLC chiral purity: (Method C) Rt. 7.44 min, 99.83% (Max).

Example 16: 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-(tert-butyl)thiazole

(187) ##STR00040##

Step 1: tert-butyl 4-(4-(tert-butyl)thiazol-2-yl)piperazine-1-carboxylate

(188) To a stirred solution of tert-butyl 4-carbamothioylpiperazine-1-carboxylate (synthesized according to Example 5, Step 1, 1.3 g, 5.3 mmol) in dioxane (10 mL), TEA (1 mL, 7 mmol) and 1-bromo-3,3-dimethylbutan-2-one (0.94 mL, 6.8 mmol) were added at rt and stirred for 16 h at 90° C. The completion of the reaction was monitored by TLC. The reaction mixture was quenched with water and extracted with EtOAc. The organic layer was dried over anhydrous Na.sub.2SO.sub.4, concentrated under vacuum and the resulting crude product was taken as such for next step without further purification. Yield: 88% (1.5 g, black liquid). LCMS: (Method A) 326.2 (M+H), Rt. 3.75 min, 60.4% (Max).

Step 2, 4-(tert-Butyl)-2-(piperazin-1-yl)thiazole hydrochloride

(189) To a stirred solution of tert-butyl 4-(4-(tert-butyl)thiazol-2-yl)piperazine-1-carboxylate (1.5 g, 4.61 mmol) in dry dioxane (2 mL), HCl in dioxane (4 N, 10 μL) was added and the reaction mixture was stirred at rt for 2 h. The reaction mixture was concentrated under vacuum and the resulting crude product was triturated in diethyl ether (100 mL), filtered and dried under vacuum to afford the title compound. Yield: 63% (1.02 g, black solid).

Step 3: 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-(tert-butyl)thiazole

(190) The title compound was synthesized following the general procedure D, using 4-(tert-butyl)-2-(piperazin-1-yl)thiazole hydrochloride (0.732 g, 2.8 mmol) and Intermediate 1 (0.28 g, 2.8 mmol) and the crude product was purified by flash chromatography (pale yellow oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.89 (s, 1H), 6.85 (d, J=7.6 Hz), 6.76 (d, J=7.6 Hz, 1H), 6.33 (s, 1H), 5.99 (m, 2H), 3.40 (m, 1H), 3.37-3.30 (m, 4H), 2.49-2.46 (m, 2H), 2.43-2.40 (m, 2H), 1.28 (d, J=6.8 Hz, 3H), 1.19 (s, 9H). LCMS: (Method A) 374.0 (M+H), Rt 3.40 min, 98.6% (Max). HPLC: (Method A) Rt 3.39 min, 99.7% (Max).

Example 17: Ethyl 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-4-carboxylate

(191) ##STR00041##

Step 1: Ethyl 2-(4-(tert-butoxycarbonyl)piperazin-1-yl)thiazole-4-carboxylate

(192) To a stirred solution of tert-butyl 4-carbamothioylpiperazine-1-carboxylate (synthesized according to Example 5, Step 1, 3.0 g, 12 mmol) in dioxane (10 mL), TEA (2.6 mL, 16 mmol) and 3-bromo-ethyl pyruvate (2.1 mL, 16 mmol) were added at rt and the mixture was stirred at 90° C. for 16 h. The completion of the reaction was monitored by TLC. The reaction mixture was quenched with water and extracted with EtOAc. The organic layer was dried over anhydrous Na.sub.2SO.sub.4, concentrated under vacuum and the resulting crude product was taken as such for next step. Yield: 95% (4 g, black solid).

Step 2: Ethyl 2-(piperazin-1-yl)thiazole-4-carboxylate hydrochloride

(193) To a stirred solution of ethyl 2-(4-(tert butoxycarbonyl)piperazin-1-yl)thiazole-4-carboxylate (4.0 g, 11.73 mmol) in dry dioxane (2 mL), HCl in dioxane (4 N, 10 mL) was added at rt and stirred for 2 h. The reaction mixture was concentrated under vacuum and the resulting crude product was triturated in diethyl ether (25 mL), filtered and dried under vacuum to afford the title compound. Yield: 90% (3.2 g, black solid). LCMS: (Method A) 242.0 (M+H), Rt. 1.88 min, 90.7% (Max).

Step 3: Ethyl 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-4-carboxylate

(194) The title compound was synthesized following the general procedure D, using ethyl 2-(piperazin-1-yl)thiazole-4-carboxylate hydrochloride and Intermediate 1 and the crude product was purified by flash chromatography followed by MD Autoprep (Method B) (yellow solid). .sup.1HNMR (400 MHz, DMSO-d.sub.6): δ 7.66 (d, J=2.0 Hz, 1H), 6.88 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.75 (d, J=8.0 Hz, 1H), 5.98 (m, 2H), 4.21-4.20 (m, 2H), 3.38-3.32 (m, 5H), 2.49-2.40 (m, 4H), 1.26-1.23 (m, 6H). LCMS: (Method A) 390.0 (M+H), Rt. 2.99 min, 97.8% (Max). HPLC: (Method A) Rt. 2.95 min, 98.9% (Max).

Example 18: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-4-carboxylic acid

(195) ##STR00042##

(196) To a stirred solution of Example 17 (0.2 g) in dry THE (10 mL), 5% NaOH in water (5 mL) was added slowly at rt and the mixture was stirred for 16 h at same temperature. It was then concentrated under vacuum, neutralised to pH=6 with 2N HCl and extracted with DCM (20 mL). The organic layer was washed with brine (10 mL), water (10 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under reduced pressure. The crude product was purified by flash chromatography followed by MD Autoprep (Method B) to afford the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.58 (s, 1H), 6.90 (s, 1H), 6.88 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 6.00-5.99 (m, 2H), 3.35-3.36 (m, 5H), 2.51-2.49 (m, 2H), 2.44-2.40 (m, 2H), 1.29-1.27 (d, J=6.8 Hz, 3H), LCMS: (Method A) 362.0 (M+H), Rt. 2.29 min, 95.5% (Max). HPLC: (Method A) Rt. 2.30 min, 95.9% (Max).

Example 19: 2-(4(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-ethylthiazole

(197) ##STR00043##

Step 1: t-Butyl 4-(4-ethylthiazol-2-yl)piperazine-1-carboxylate

(198) To a stirred solution of Pert-butyl 4-carbamothioylpiperazine-1-carboxylate (synthesized according to Example 5, Step 1, 2.0 g, 8.16 mmol) in dioxane (20 mL), TEA (1.7 mL, 10.6 mmol) and 1-bromobutan-2-one (1.2 mL, 10 mmol) were added and stirred at 80° C. for 16 h. The completion of the reaction was monitored by TLC. The reaction mixture was quenched with water (10 mL) and extracted with EtOAc (2×25 mL). The organic layer was separated, dried over anhydrous Na.sub.2SO.sub.4, concentrated under vacuum. The resulting product was taken as such for next step. Yield: 86% (2.1 g, pale yellow solid). LCMS: (Method A) 298.0 (M+H), Rt. 2.94 min, 93.1% (Max).

Step 2: 4-Ethyl-2-(piperazin-1-yl)thiazole hydrochloride

(199) To a stirred solution of tert-butyl 4-(4-ethylthiazol-2-yl)piperazine-1-carboxylate (1.9 g, 6.3 mmol) in dry dioxane (2 mL), HCl in dioxane (4 N, 10 mL) was added and the reaction mixture was stirred at rt for 2 h. The reaction mixture was concentrated under vacuum and the crude product was triturated in diethyl ether (15 mL), filtered and dried under vacuum to afford the title compound. Yield: 53% (0.8 g, black solid).

Step 3: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-ethylthiazole

(200) The title compound was synthesized following the general procedure D, using 4-ethyl-2-(piperazin-1-yl)thiazole hydrochloride (1.1 g, 4.7 mmol) and Intermediate 1 (0.9 g, 4.7 mmol). The crude product was purified by flash chromatography (pale yellow oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.89 (d, J=1.6 Hz, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.75 (d, J=7.5 Hz, 1H), 6.35 (s, 1H), 5.98 (m, 2H), 3.40-3.37 (m, 1H), 3.37-3.30 (m, 4H), 2.51-2.38 (m, 6H), 1.28 (d, J=6.8 Hz, 3H), 1.23 (t, J=7.6 Hz, 3H). LCMS: (Method A) 346.0 (M+H), Rt. 2.31 min, 98.0% (Max). HPLC: (Method A) Rt. 2.34 min. 99.4% (Max).

Example 20: 1-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)-4-(6-chloropyridin-3-yl)piperazine

(201) ##STR00044##

(202) The title compound was synthesized following the general procedure D, using Intermediate 1 and 1-(5-chloro-2-pyridyl) piperazine. The crude product was purified by flash chromatography (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.8): δ 8.07 (d, J 2.4 Hz, 1H), 7.57-7.54 (m, 1H), 6.88-6.74 (m, 4H), 5.98 (m, 2H), 3.42 (q, J=6.4 Hz, 1H), 2.46-2.43 (m, 2H), 2.37-2.34 (m, 2H), 1.28 (d, J=6.4 Hz, 3H). LCMS: (Method A) 346.0 (M+H), Rt. 3.27 min, 98.7% (Max). HPLC: (Method A) Rt 3.25 min, 99.2% (Max) Example 21: 1-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)-4-(6-methylpyridin-2-yl)piperazine

(203) ##STR00045##

(204) To a stirred solution of Intermediate 2 (0.12 g, 0.5 mmol) in dry DMF (2 mL), 2-fluoro-6-methyl pyridine (0.11 g, 0.99 mmol) and DIPEA (0.26 g, 2.4 mmol) were added at rt and the reaction mixture was stirred at 120° C. for 16 h. The reaction mixture was cooled to rt and concentrated under vacuum. The resulting crude product was purified by flash chromatography followed by preparative HPLC (Method PA) to afford the title compound (brown liquid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.40-7.36 (m, 1H), 6.90 (s, 1H), 6.85 (d, J=7.6 Hz, 1H), 6.77 (d, J=7.6 Hz, 1H), 6.55-6.46 (m, 2H), 5.98 (s, 2H), 3.410-3.415 (m, 5H), 2.38-2.37 (m, 4H), 2.28-2.30 (m, 3H), 1.29 (d, J=7.2 Hz, 3H). LCMS: (Method A) 326.2 (M+H), Rt. 1.89 min, 94.9% (Max). HPLC. (Method A) Rt 1.91 min, 96.6% (Max).

Example 22: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-4-amine

(205) ##STR00046##

(206) The title compound was synthesized by following procedure D, using Intermediate 2 (0.228 g, 0.85 mmol) and 4-amino-2-chloro pyrimidine (0.1 g, 0.77 mmol). The crude product was purified by flash chromatography followed by MD Autoprep (Method B) (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.70 (d, J=5.2 Hz, 1H), 6.88 (s, 1H), 6.83 (d, J=8.0 Hz, 1H), 6.75 (d, J=7.6 Hz, 1H), 6.36 (s, 2H), 5.98 (m, 2H), 5.69 (d, J=5.6 Hz, 1H), 3.6-3.58 (m, 4H), 3.33-3.32 (m, 1H), 2.38-2.34 (m, 2H), 2.31-2.27 (m, 2H), 1.27 (d, J=6.8 Hz, 3H). LCMS: (Method A) 328.0 (M+H), Rt. 1.85 min, 97.2% (Max). HPLC: (Method A) Rt. 1.84 min, 97.1% (Max).

Example 23: N-(2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-4-yl)acetamide

(207) ##STR00047##

Step 1: N-(2-Chloropyrimidin-4-yl)acetamide

(208) To a stirred solution of 4-amino-2-chloro pyrimidine (0.6 g, 4.65 mmol) in DCM (5 mL), pyridine (1.8 mL) and acetic anhydride (0.71 g, 6.9 mmol) were added at 0° C. and stirred at 75° C. for 6 h. The reaction mixture was concentrated under vacuum and the resulting crude product was dissolved in EtOAc (15 mL). The organic layer was washed with water (10 mL), brine (10 mL) and dried over anhydrous Na.sub.2SO.sub.4. After concentration under vacuum, the crude product was taken as such for next step. Yield: 56.9% (0.45 g, pale brown solid). LCMS: (Method A) 172.0 (M+H), Rt. 1.58 min, 80.2% (Max).

Step 2: N-(2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-4-yl)acetamide

(209) The title compound was synthesized following procedure D and using Intermediate 2 (0.25 g, 0.93 mmol) and N-(2-chloropyrimidin-4-yl)acetamide (0.19 g, 1.12 mmol). The crude product was purified by flash chromatography followed by MD Autoprep (Method B) (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 10.30 (s, 1H), 8.18 (d, J=5.6 Hz, 1H), 7.21 (d, J=5.6 Hz, 1H), 6.89 (d, J=1.6 Hz, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.75 (dd, J=1.6, 8 Hz, 1H), 5.98 (m, 2H), 3.68-3.66 (m, 4H), 3.37-3.36 (m, 1H), 2.42-2.38 (m, 2H), 2.35-2.31 (m, 2H), 2.07 (s, 3H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 370.0 (M+H), Rt. 2.26 min, 97.5% (Max). HPLC: (Method A) Rt. 2.21 min, 98.9% (Max).

Example 24: 4(4-(1-Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-6-chloropyrimidine

(210) ##STR00048##

(211) To a stirred solution of Intermediate 2 (0.2 g, 0.74 mmol) in DMF (5 mL), TEA (0.5 mL, 3.70 mmol) and 4,6-dichloro pyrimidine (0.11 g, 0.74 mmol) were added and the resulting mixture was stirred at 120° C. for 2 h. It was concentrated under vacuum and the resulting crude product was dissolved in DCM and washed with water, dried over anhydrous Na.sub.2SO.sub.4, and concentrated under vacuum. The crude product was purified by flash chromatography to afford the title product (brown oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.30 (s, 1H), 6.91 (s, 1H), 6.89 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.75 (d, J=8.0 Hz, 1H), 5.98 (m, 2H), 3.55-3.52 (m, 4H), 3.39-3.37 (m, 1H), 2.43-2.39 (m, 2H), 2.36-2.32 (m, 2H), 1.27 (d, J=6.8 Hz, 3H).

(212) LCMS: (Method A) 347.0 (M+H), Rt. 2.55 min, 98.7% (Max). HPLC (Method A) Rt. 2.57 min, 99.7% (Max).

Example 26: (R)-2-(4(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidine or (S)-2-(4(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidine

(213) ##STR00049##

(214) The two enantiomers of Example 11 were separated by chiral preparative HPLC (Method PF). The first eluting compound has Rt. 8.50 min (colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.32 (d, J=4.8 Hz, 2H), 6.88 (s, 1H), 6.83 (d, J=8.0 Hz, 1H), 6.74 (d, J=8.0 Hz, 1H), 6.58 (t, J=4.4 Hz, 1H), 5.97 (m, 2H), 3.68-3.67 (m, 4H), 3.37-3.35 (m, 1H), 2.49-2.38 (m, 2H), 2.35-2.30 (m, 2H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 313.0 (M+H), Rt. 2.45 min, 99.5% (Max). HPLC: (Method A) Rt. 2.47 min, 99.5% (Max). HPLC chiral purity: (Method D) Rt. 8.50 min, 100% (Max). Example 26 is the second eluting compound, with Rt. 13.33 min (colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.32 (d, J=4.8 Hz, 2H), 6.88 (s, 1H), 6.83 (d, J=8.0 Hz, 1H), 6.74 (d, J=8.0 Hz, 1H), 6.58 (t, J=4.4 Hz, 1H), 5.97 (m, 2H), 3.68-3.67 (m, 4H), 3.36-3.33 (m, 1H), 2.49-2.38 (m, 2H), 2.35-2.30 (m, 2H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 313.0 (M+H), Rt. 2.44 min, 99.5% (Max). HPLC: (Method A) Rt. 2.47 min, 99.8% (Max). HPLC chiral purity: (Method D) Rt. 13.33 min, 100% (Max).

Example 27: Ethyl 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylate

(215) ##STR00050##

Step 1: Ethyl 2-bromothiazole-5-carboxylate

(216) To a stirred solution of ethyl-2-amino thiazole-5-carboxylate (10.0 g, 46.45 mmol, Combi block) in 48% HBr (75 mL), sodium nitrite (4.80 g, 69.68 mmol) in water (50 mL) was added dropwise at 0° C. and the reaction mixture was stirred at 0° C. for 15 min. Copper (I)bromide (6.66 g, 46.45 mmol) in 48% HBr (75 mL) was added dropwise at 0° C. and the reaction mixture was stirred at rt for 4 h. The reaction mixture was diluted with DCM (200 mL) and Washed with water (50 mL), brine (50 mL), dried over Na.sub.2SO.sub.4 and concentrated under reduced pressure. The crude product was purified by flash chromatography (100% CHCl.sub.3) to afford the title compound. Yield: 50.18% (5.5 g, yellow liquid). .sup.1H NMR (400 MHz, DMSO-d.sub.8): δ 8.16 (s, 1H), 4.38 (q, J=7.16 Hz, 2H), 1.40 (t, J=7.12 Hz, 3H). LCMS: (Method A) 235.9 (M+H), Rt. 3.85 min, 98.6% (Max).

Step 2: Ethyl 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylate

(217) To a stirred solution of Intermediate 2 (1.5 g, 6.40 mmol) in dry DMF (15 mL), ethyl 2-bromothiazole-5-carboxylate (1.96 g, 8.32 mmol) and TEA (3.5 mL, 25.6 mmol) were added at rt and the reaction mixture was stirred at 120° C. for overnight. The reaction mixture was cooled to rt and was diluted with EtOAc. The organic layer was washed with brine (10 mL), water (10 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The crude product was purified by column chromatography to afford the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.83 (s, 1H), 6.89 (s, 1H), 6.89 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 5.99 (s, 2H), 4.19 (q, J=6.8 Hz, 2H), 3.50-3.42 (m, 5H), 2.51-2.46 (m, 2H), 2.44-2.33 (m, 2H), 1.30-1.22 (m, 6H). LCMS: (Method A) 247.2 (M+H), Rt. 3.17 min, 78.6% (Max).

Example 28: (2-14(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-5-yl)methanol

(218) ##STR00051##

(219) The title compound was synthesized following the general procedure A starting from Example 27. The crude product was purified by flash chromatography followed by MD Autoprep (Method B) (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.96 (s, 1H), 6.89 (s, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.75 (d, J=7.6 Hz, 1H), 5.98 (m, 2H), 5.21 (t, J=5.6 Hz, 1H), 4.44 (d, J=5.6 Hz, 2H), 3.40-3.37 (m, 1H), 3.34-3.31 (m, 4H), 2.46-2.42 (m, 2H), 2.41-2.38 (m, 2H), 1.28 (d, J=6.4 Hz, 3H). LCMS: (Method A) 348.0 (M+H), Rt. 1.91 min, 96.3% (Max). HPLC: (Method A) Rt. 1.89 min, 95.1% (Max)

Example 29: (2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-4-yl)methanol

(220) ##STR00052##

(221) The title compound was synthesized following general procedure A, starting with Example 17 (0.5 g) and the crude product was purified by flash chromatography (pale yellow oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.89 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.75 (dd, J=1.6, 8.0 Hz, 1H), 6.52 (s, 1H), 5.99 (m, 2H), 5.11-5.09 (t, J=8.0 Hz, 1H), 4.31 (d, J=8.0 Hz, 2H), 3.40-3.34 (m, 5H), 2.51-2.49 (m, 2H), 2.42-2.32 (m, 2H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 348.0 (M+H). Rt. 1.98 min, 94.8% (Max). HPLC (Method A) Rt. 1.99 min, 96.0% (Max).

Example 30: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-methylthiazole-4-carboxamide

(222) ##STR00053##

(223) To a stirred solution of Example 18 (0.3 g, 0.5 mmol) in DCM (10 mL), DIPEA (0.6 mL 2 mmol) and HATU (0.56 g, 1.48 mmol) were added slowly at 0° C. The reaction mixture was stirred at 0° C. for 20 min. Methyl amine in THE (0.6 mL, 1.48 mmol) was added and the reaction mixture was stirred overnight at room temperature. The reaction mixture was diluted with EtOAc (10 mL) and washed with water (10 mL) and brine (10 mL). The organic layer was dried over anhydrous Na.sub.2SO.sub.4, concentrated under vacuum. The crude product was purified by flash chromatography followed by MD Autoprep (Method B) to afford the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.96 (d, J=4.8 Hz, 1H), 7.33 (s, 1H), 6.89 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.75 (dd, J=1.6, 8.0 Hz, 1H), 5.98 (m, 2H), 3.43-3.38 (m, 5H), 2.72 (d, J=4.8 Hz, 3H), 2.41-2.39 (m, 4H), 1.27 (d, J=6.4, 3H). LCMS: (Method A) 375.0 (M+H), Rt. 2.34 min, 98.2% (Max). HPLC: (Method A) Rt. 2.32 min, 99.0% (Max).

Example 32: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-isopropylthiazole-4-carboxamide

(224) ##STR00054##

(225) The title compound was synthesized by following the same procedure as described for Example 30, using Example 18 (0.3 g, 0.9 mmol) and isopropyl amine (0.09 mL, 1.08 mmol) as starting material (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.8): δ 7.62 (d, J=8.4 Hz, 1H), 7.35 (s, 1H), 6.90 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.77 (d, J=8.0 Hz, 1H), 5.99 (m, 2H), 4.04-3.99 (m, 1H), 3.43-3.34 (m, 5H), 2.50-2.42 (m, 4H), 1.29 (d, J=6.8 Hz, 3H), 1.14-1.07 (m, 6H). LCMS: (Method A) 403.0 (M+H), Rt. 2.90 min, 95.5% (Max). HPLC: (Method A) Rt. 2.91 min, 96.5% (Max).

Example 33: 2-(4(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-cyclohexylthiazole-4-carboxamide

(226) ##STR00055##

(227) The title compound was synthesized by following the same procedure as described for Example 30, using Example 18 (0.3 g, 0.9 mmol) and cyclohexyl amine (0.12 mL, 1.08 mmol) as starting material (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.60 (d, J=8.4 Hz, 1H), 7.35 (s, 1H), 6.90 (s, 1H), 6.85 (d, J=7.6 Hz, 1H), 6.77 (d, J=7.6 Hz, 1H), 5.99 (s, 2H), 3.68-3.67 (m, 1H), 3.42 (br.s. 4H), 2.50-2.42 (m, 4H), 1.74-1.70 (m, 4H), 1.59-1.56 (m, 1H), 1.36-1.23 (m, 8H), 1.13-1.09 (m, 1H). LCMS: (Method A) 443.0 (M+H), Rt 3.57 min, 97.9% (Max). HPLC: (Method A) Rt. 3.62 min, 99.3% (Max).

Example 34: (R)-2-(4-(1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)pyrimidine or (S)-2-(4-(1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-ethyl)piperazin-1-yl)pyrimidine

(228) ##STR00056##

(229) The title compound was synthesized by following procedure D, using Intermediate 3 (2.2 g, 11 mmol) and 1-(2-pyrimidyl) piperazine (1.8 g, 11 mmol). The crude product was purified by flash chromatography followed by preparative chiral HPLC (Method PF) to separate the two enanatiomers. The first eluting compound has Rt. 7.90 min (Method D) (off white solid). .sup.1H NMR 400 MHz, DMSO-d.sub.6): δ 8.32 (d, J=4.4 Hz, 2H), 6.78-6.75 (m, 3H), 6.59 (t, J=9.6 Hz, 1H), 4.21-4.20 (m, 4H), 3.68-3.67 (m, 4H), 3.36-3.26 (m, 1H), 2.49-2.39 (m, 2H), 2.34-2.32 (m, 2H), 1.25 (d, J=6.4 Hz, 3H). LCMS: (Method A) 327.2 (M+H), Rt. 2.51 min, 98.7% (Max). HPLC: (Method A) Rt. 2.54 min, 99.3% (Max). HPLC chiral purity: (Method D) Rt. 7.90 min, 100.0% (Max). Example 34 corresponds to the second eluting compound, with Rt. 13.92 min (Method D) (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.32 (d, J=4.4 Hz, 21-1), 6.80-6.75 (m, 3H), 6.59 (t, J=9.6 Hz, 1H), 4.21-4.20 (m, 4H), 3.69-3.66 (m, 4H), 3.33-3.32 (m, 1H), 2.44-2.38 (m, 2H), 2.36-2.31 (m, 2H), 1.26 (d, J=6.8 Hz, 3H). LCMS: (Method A) 327.0 (M+H), Rt. 2.51 min, 99.1% (Max). HPLC: (Method A) Rt. 2.49 min, 99.2% (Max). HPLC chiral purity: (Method D) Rt. 13.92 min, 99.88% (Max).

Example 35: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-4 carboxamide

(230) ##STR00057##

(231) The title compound was synthesized by following the same procedure as described for Example 30, using Example 18 (0.3 g, 0.9 mmol) and ammonia in THF (4.5 mL, 9 mmol, 2 M in THF) as starting material. The crude mixture was purified by flash chromatography (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.39 (br s. 2H), 7.37 (s, 1H), 6.90 (s, 1H), 6.85 (d, J=7.6 Hz, 1H), 6.77 (d, J=7.2 Hz, 1H), 5.99 (br s, 2H), 3.41-3.34 (m, 5H), 2.50-2.43 (m, 4H), 1.30 (d, J=6.8 Hz, 3H). LCMS: (Method A) 361.0 (M+H), Rt. 2.19 min, 94.8% (Max). HPLC: (Method A) Rt. 2.17 min, 98.0% (Max).

Example 36: 5-(4(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-2-methylthiazole

(232) ##STR00058##

(233) The title compound was synthesized following general procedure D, using 2-bromo-5-methyl thiazole and Intermediate 2. The crude product was purified by flash chromatography (brown solid). .sup.1H NMR (DMSO-d.sub.6): δ 6.89 (s, 1H), 6.85 (d, J=7.6 Hz. 1H), 6.80 (d, J=7.6 Hz, 1H), 6.76-6.74 (m, 1H), 5.99 (m, 2H), 3.40-3.36 (m, 1H), 3.29-3.26 (m, 4H), 2.46-2.45 (m, 2H), 2.42-2.38 (m, 2H), 2.23 (s, 3H), 1.28-1.27 (m, 3H). LCMS: (Method A) 332.0 (M+H), Rt. 2.13 min, 96.0% (Max). HPLC: (Method A) Rt. 2.11 min, 97.4% (Max).

Example 37: 5-(4(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-2-methylthiazole

(234) ##STR00059##

(235) The mixture of 5-bromo-2-methyl thiazole (150 mg, 0.84 mmol), Intermediate 2 (200 mg, 0.84 mmol) and TEA (344 mg, 3.4 mmol) in DMF (4 mL) was heated at 130° C. for overnight. It was concentrated under vacuum and to the resulting crude product was dissolved in EtOAc (10 mL) and washed with water (10 mL). The organic layer was dried over Na.sub.2SO.sub.4 and concentrated. The crude product was purified by flash column chromatography (brown solid). .sup.1H NMR (DMSO-d.sub.6): δ 6.90 (s, 1H), 6.85-6.78 (m, 3H), 5.95 (brs, 2H), 3.55-3.51 (m, 1H), 3.12-3.11 (m, 4H), 2.80-2.65 (m, 4H), 2.54 (s, 3H), 1.44 (d, J=5.6 Hz, 3H). LCMS: (Method A) 332.0 (M+H), Rt. 5.71 min, 97.35% (Max). HPLC: (Method B) Rt. 5.64 min, 96.8% (Max).

Example 38: 5-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-2-chloropyrimidine

(236) ##STR00060##

(237) The title compound was synthesized following the general procedure D, using Intermediate 2 and 2,5-dichloropyrimidine. The crude product was purified by flash chromatography (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.38 (s, 2H), 6.88 (s, 1H), 6.83 (d, J=8.0 Hz, 1H), 6.75 (m, J=8.0 Hz, 1H), 5.98 (m, 2H), 3.68-3.65 (m, 4H), 3.38-3,369 (m, 1H), 2.44-2.39 (m, 1H), 2.36-2.32 (m, 2H), 1.27 (d, J=6.8 Hz, 3H). LCMS: (Method A) 347.0 (M+H), Rt. 3.24 min, 98.3% (Max). HPLC: (Method A) Rt. 3.22 min, 99.6% (Max).

Example 39: 244-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-methoxypyrimidine

(238) ##STR00061##

(239) The title compound was synthesized following general procedure D, using Intermediate 2 and 2-chloro-5-methoxy pyrimidine. The crude product was purified by flash chromatography (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.04 (d, J=5.6 Hz, 1H), 6.88-0 (s, 1H), 6.83 (d, J=8.0 Hz, 1H), 6.74 (d, J=8.0 Hz, 1H), 6.02 (d, J 5.6 Hz, 1H), 5.98 (br s, 2H), 3.79 (s, 3H), 3.72-3.66 (m, 4H), 3.37-3.39 (m, 1H), 2.43-2.39 (m, 2H), 2.34-2.30 (m, 2H), 1.28-1.26 (d, J=6.4 Hz, 3H). LCMS: (Method A) 343.0 (M+H), Rt. 2.27 min, 99.6% (Max). HPLC: (Method A) Rt. 2.27 min, 99.4% (Max).

Example 40: 4-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-2-chloropyrimidine

(240) ##STR00062##

(241) The title compound was synthesized following the general procedure D, using Intermediate 2 and 2,4-dichloropyrimidine. The crude product was purified by flash chromatography (yellow oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.04 (d, J=7.6 Hz, 1H) 6.89 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.80-6.75 (m, 2H), 5.99 (m, 2H), 3.59 (br. s, 41-1), 3.39 (q, J=6.4 Hz, 1H), 2.45-2.42 (m, 2H), 2.38-2.33 (m, 2H), 1.29-1.27 (d; J=6.8 Hz, 3H). LCMS: (Method A) 347.0 (M+H), Rt. 2.59 min, 96.4% (Max). HPLC: (Method A) Rt. 2.51 min, 982% (Max).

Example 41: 5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-amine

(242) ##STR00063##

(243) The title compound was synthesized following the general procedure D, using Intermediate 2 and 2-amino-5-bromo-1,3,4-thiadiazole. The crude product was purified by recrystallisation. Yield: 81% (2.0 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.8): b 6.88-6.87 (m, 1H), 6.85-6.83 (m, 1H), 6.76-6.73 (m, 1H), 6.47 (s, 2H) 5.99 (s, 2H), 3.40-3.34 (m, 1H), 3.19-3.17 (m, 4H), 2.47-2.43 (m, 2H), 2.40-2.36 (m, 2H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 334.0 (M+H), Rt. 1.84 min, 96.5% (Max). HPLC-(Method A) Rt. 1.83 min, 98.2% (Max).

Example 42: 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N,N-dimethylthiazole-4-carboxamide

(244) ##STR00064##

(245) The title compound was synthesized following the same procedure as described for Example 30, using Example 18 (0.3 g, 0.9 mmol) and dimethyl amine (0.9 mL, 1.8 mmol, 2 M in THF) as starting material (pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.16 (s, 1H), 6.89 (s, 1H), 6.85 (d, J=7.6 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 5.99 (br s, 2H), 3.41-3.34 (m, 5H), 3.30 (s, 3H), 2.90 (s, 3H), 2.43-2.42 (m, 4H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 389.0 (M+H), Rt. 2.41 min, 95.1% (Max) HPLC: (Method A) Rt. 2.38 min, 94.3% (Max).

Example 43: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-isopropylthiazole-5-carboxamide

(246) ##STR00065##

Step 1: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylic acid

(247) To a stirred solution of Example 27 (0.8 g, 2.05 mmol) in dioxane (24 mL), NaOH (2M in water, 3 mL) was added slowly. The reaction mixture was stirred overnight at room temperature. It was then concentrated under vacuum and neutralized with HCl (1.5 N) up to pH=6 and was extracted with DCM (25 mL). The organic layer was washed with water (15 mL), brine (15 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under reduced pressure to afford the title compound (off white solid). LCMS: (Method A) 362.0 (M+H), Rt. 2.30 min, 77.6% (Max).

Step 2: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-isopropylthiazole-5-carboxamide

(248) To a solution of 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylic acid (0.1 g, 0.277 mmol) in dry DCM (2 mL), HATU (0.16 g, 0.41 mmol) was added and the resulting mixture was stirred at room temperature for 1 h. Isopropyl amine (0.02 g, 0.36 mmol) and DIPEA (0.14 mL, 0.83 mmol) were added at 0° C. and the mixture was stirred overnight at room temperature. The reaction was quenched with water (10 mL) and extracted with EtOAc (25 mL). The organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude product was purified by MD Autoprep (Method B) to afford the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.96 (d, J=7.6 Hz, 1H), 7.78 (s, 1H), 6.89 (s, 1H), 6.85 (d, J=7.6 Hz, 1H), 6.75 (d, J=8.0 Hz, 1H), 5.99 (br s, 2H), 3.98-3.96 (m, 1H), 3.42-3.41 (m, 5H), 2.42-2.38 (m, 4H), 1.28 (d, J=6.8 Hz, 3H), 1.11 (d, J=6.8 Hz, 6H). LCMS: (Method A) 403 (M+H), Rt. 2.72 min, 97.81% (Max). HPLC: (Method A) Rt. 2.70 min, 98.62% (Max).

Example 44: N-(5-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)acetamide

(249) ##STR00066##

(250) To a stirred solution of Example 41 (0.06 g, 0.7 mmol), diisopropylethylamine (0.4 mL, 0.32 mmol) in dry DCM (4.0 mL), acetic anhydride (0.96 mL, 1.05 mmol) was added at 0° C. and the resulting mixture was stirred for 5 h at rt. The completion of the reaction was monitored by TLC. The reaction mixture was concentrated and the crude products were purified by flash chromatography to afford the title compound (colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 12.03 (m, 1H), b 6.89 (m, 1H), 6.86-6.84 (m, 1H), 6.77-6.75 (m, 1H), 5.99 (m, 2H), 3.41-3.40 (m, 5H), 2.51-2.50 (m, 2H), 2.43-2.40 (m, 2H), 2.10 (s, 3H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 376.0 (M+H), Rt. 2.512 min, 96.77% (Max). HPLC: (Method A) Rt. 2.262 min, 98.69% (Max).

Example 45: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-propylpyrimidin-4-amine

(251) ##STR00067##

Step 1: 2-chloro-N-propylpyrimidin-4-amine

(252) To a stirred solution of 2,4-dichloro pyrimidine (0.2 g, 1.34 mmol) in dry THF (10 mL), TEA (0.54 g, 5.36 mmol) and propyl amine (0.088 g, 1.34 mmol) were added and the resulting mixture was stirred at room temperature for 10 h. It was diluted with water and extracted with EtOAc. The organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum to afford the title compound. Yield: 70% (0.18 g, colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.92-7.85 (m, 2H), 6.49-6.41 (m, 1H), 3.21 (t, J 6.4 Hz 2H), 1.56-1.47 (m, 2H), 0.91-0.87 (t, J=7.36 Hz, 3H). LCMS: (Method A) 172.0 (M+H), Rt. 2.07 min, 99.5% (Max).

Step 2: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-propylpyrimidin-4-amine

(253) To a stirred solution of Intermediate 2 (0.2 g, 0.9 mmol) in dry DMF (4.0 mL), 2-chloro-N-propylpyrimidin-4-amine (0.18 g, 1.04 mmol) and TEA (0.5 mL, 3.2 mmol) were added at 0° C. The reaction mixture was stirred at 130° C. for overnight. It was then concentrated and the crude product was purified by flash chromatography to afford the title compound (colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.65 (s, 1H), 6.89-6.75 (m, 3H), 6.12-5.95 (m, 3H), 5.83 (br. s, 1H), 3.62 (m, 4H), 3.20 (s, 3H), 2.51-2.49 (m, 4H), 1.50 (qm, 2H), 1.28-1.24 (m, 3H), 0.88 (t, J=8.0 Hz, 3H). LCMS: (Method A) 370.0 (M+H), Rt 2.604 min, 97.37% (Max). HPLC: (Method A) Rt. 2.54 min, 99.78% (Max).

Example 46: 4-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-2-amine

(254) ##STR00068##

(255) The title compound was synthesized following the general procedure D, using Intermediate 2 and 2-amino-4-chloropyrimidine. The crude product was purified by flash chromatography (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7,72 (d, 1H, J=6.0 Hz), 6.88 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.75 (d, J=8.0 Hz, 1H), 5.98-5.95 (m, 5H), 3.46-3.45 (m, 4H), 3.37-3.35 (m, 1H), 2.40-2.37 (m, 2H), 2.33-2.29 (m, 2H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 328.0 (M+H), Rt. 1.66 min, 97.06% (Max). HPLC: (Method A) Rt. 1.81 min, 97.5% (Max).

Example 47: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N,N-dimethylthiazole-5-carboxamide

(256) ##STR00069##

(257) To a stirred solution of 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylic acid (Example 43, Step 1, 0.155 g, 0.4 mmol) and HATU (0.206 g, 1.2 mmol) in dry DMF (3 mL), DIPEA (0.1 mL, 0.8 mmol) was added and the resulting mixture was stirred for 30 min at room temperature. Dimethylamine in THE (0.5 mL, 8.4 mmol) was then added at 0° C. The reaction mixture was stirred overnight at room temperature. Solvents were evaporated and the resulting crude mixture was diluted with EtOAc, washed with water, 10% sodium bicarbonate solution, brine and dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the resulting crude product was purified by MD Autoprep (Method B) to afford the title compound (off white solid). .sup.1H NMR (400 MHz, CDCl.sub.3): δ 7.47 (s, 1H), 6.87 (s, 1H), 6.77-6.76 (m, 2H), 5.96 (s, 2H), 3.52-3.51 (m, 4H), 3.37-3.36 (m, 1H), 3.17 (s, 6H), 2.57-2.52 (m, 4H), 2.26 (s, 3H). LCMS: (Method B) 389 (M+H), Rt. 5.049 min, 98.02% (Max). HPLC: (Method A) Rt. 2.42 min, 98.49% (Max).

Example 48: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-5-carboxamide

(258) ##STR00070##

(259) To a solution of 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylic acid (Example 43. Step 1, 0.15 g, 0.4 mmol) in dry DMF (3 mL), HATU (0.206 g, 1.2 mmol) was added and stirred at room temperature for 20 min. Ammonia in THE (5 mL) and DIPEA (0.14 mL, 0.83 mmol) were then added at 0° C. The resulting reaction mixture was stirred at room temperature overnight. It was concentrated under reduced pressure. EtOAc was added to the resulting mixture and was washed with water, 10% sodium bicarbonate solution, brine and dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by MD Autoprep (Method C) to afford the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.76 (s, 1H), 7.67 (br s, 1H), 7.11 (br s, 1H), 6.89 (s, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.76 (d, J=7.6 Hz, 1H), 5.99 (br s, 2H), 3.41-3.40 (m, 5H), 2.50-2.39 (m, 4H), 1.28 (d, J=8.0 Hz, 3H). LCMS: (Method A) 361.0 (M+H), Rt 2.01 min, 99.2% (Max). HPLC: (Method A) Rt. 2.03 min, 98.5% (Max).

Example 49: 2-(4-(1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-4-carboxamide

(260) ##STR00071##

Step 1: Ethyl-2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-4-carboxylate

(261) The title compound was synthesized following general procedure D, using ethyl 2-(piperazin-1-yl)thiazole-4-carboxylate hydrochloride (Example 17, Step 2, 5.0 g, 20.4 mmol) and Intermediate 3 (4.97 g, 24 mmol). The crude product was purified by flash chromatography. Yield: 54% (4.5 g, black oil).

Step 2: 2-(4-(1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-4-carboxylic acid

(262) To a stirred solution of ethyl-2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-4-carboxylate (4.5 g, 11.1 mmol) in THF (20 mL), 10% NaOH (50 mL) was added slowly. The reaction mixture was stirred at room temperature for overnight. It was concentrated under vacuum, neutralized with NCI (2 N in water) to pH=6 and extracted with DCM (25 mL). The organic layer was washed with water (10 mL), brine (25 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under reduced pressure afford the title compound (pale yellow solid). .sup.1H NMR (400 MHz, CDCl.sub.3): δ 7.44 (s, 1H), 6.94-6.76 (m, 3H), 4.26 (s, 4H), 3.65-3.49 (m, 5H), 2.59-3.54 (m, 4H), 2.49-2.45 (m, 4H), 1.26 (d, J=4.8 Hz, 3H), LCMS: (Method A) 376.0 (M+H), Rt. 2.36 min, 79.7% (Max).

Step 3: 2-(4-(1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-4-carboxamide

(263) The title compound was synthesized according to the same procedure as described for Example 30, using 2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1 yl)thiazole-4-carboxylic acid and NH.sub.3 in THF. The crude product was purified by flash chromatography (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.39 (br s, 2H), 7.35 (s, 1H), 6.80-6.76 (m, 3H), 4.21 (s, 4H), 3.36-3.38 (m. 5H), 2.49-2.45 (m, 4H), 1.27-1.23 (m, 3H). LCMS: (Method A) 375.0 (M+H), Rt. 2.21 min, 96.1% (Max). HPLC: (Method A) Rt. 2.28 min, 96.6% (Max).

Example 50: 2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N-methylthiazole-4-carboxamide

(264) ##STR00072##

(265) The title compound was synthesized according to the same procedure as described for Example 30, using 2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1 yl)thiazole-4-carboxylic acid and MeNH.sub.2 in THF. The crude product was purified by flash chromatography (yellow oil). .sup.1H NMR (400 MHz, DMSO-d.sub.8): δ 8.07 (q, J=4.0 Hz, 1H), 7.33 (s, 1H), 6.76-6.39 (m, 3H), 4.21 (s, 4H), 3.38-3.32 (m, 5H), 2.75-2.71 (m, 3H), 2.49-2.48 (m, 4H), 1.26-1.25 (m, 3H). LCMS: (Method A) 389.0 (M+H), Rt. 2.38 min, 95.9% (Max). HPLC: (Method A) Rt. 2.46 min, 97.7% (Max).

Example 51: Ethyl 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidine-5-carboxylate

(266) ##STR00073##

Step 1: tart-Butyl 4-(5-bromopyrimidin-2-yl)piperazine-1-carboxylate

(267) To a stirred solution of 1-boc-piperazine (6.0 g, 31.5 mmol) in DMF (50 mL), triethyl amine (7 mL, 46.00 mmol) and 5-bromo-2-chloropyrimidine (6.3 g, 37.00 mmol) were added and the reaction mixture was stirred at 90° C. for 8 h. The reaction mixture was concentrated under reduced pressure. Water (50 mL) was added and the desired product was extracted with DCM (150 mL). The organic layer was dried over Na.sub.2SO.sub.4 and concentrated under reduced pressure. The crude product was purified by flash chromatography (10% EtOAc in pet ether) to afford the title compound. Yield: 76% (7 g, white). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.46 (s, 2H), 3.68-3.67 (m, 4H), 3.39-3.37 (m, 4H), 1.40 (s, 9H). LCMS: (Method A) 289.0 (M+H), Rt. 5.19 min, 99.05% (Max).

Step 2: 2-(4-(t-Butoxycarbonyl)piperazin-1-yl)pyrimidine-5-carboxylic acid

(268) To a stirred solution of tart-butyl 4-(5-bromopyrimidin-2-yl)piperazine-1-carboxylate (5 g, 14.5 mmol) in dry THF (50 mL), n-BuLi (13.5 mL, 21.7 mmol, 1.6 M THF) was added dropwise at −75° C. and stirred for 2 h at the same temperature. Dry CO.sub.2 gas was passed through the reaction mixture for 1 h. The reaction was stirred for 30 min at same temperature and 30 min at rt. It was cooled to 0° C. and quenched by using 10% ammonium chloride solution. The product was extracted with DCM (150 mL). The organic layer was washed with water (50 mL), brine (50 mL) and dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvents, the title compound was isolated and used in the next step without further purification. Yield: 55% (2.5 g, pale yellow oil), LCMS: (Method A) 308.0 (M+H), Rt. 3.61 min, 55.64% (Max).

Step 3: Ethyl 2-(piperazin-1-yl)pyrimidine-5-carboxylate

(269) To a stirring solution of 2-(4-(tert-butoxycarbonyl)piperazin-1-yl)pyrimidine-5-carboxylic acid (2.0 g, 6.0 mmol) in EtOH (250 mL), SOCl.sub.2 (1.7 mL, 16.23 mmol) was added slowly at 0° C. and the mixture was stirred at 90° C. for 15 h. It was concentrated under reduced pressure to afford the title compound (off white solid). LCMS: (Method A) 236 (M+H), Rt. 2.14, 49.8% (Max).

Step 4: Ethyl 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidine-5 carboxylate

(270) To a stirring solution of ethyl 2-(piperazin-1-yl)pyrimidine-5-carboxylate (2.5 g, 9.0 mmol), diisopropyl ethyl amine (5.9 mL, 27.0 mmol) in dry acetontrile (50 mL), Intermediate 1 (2.08 g, 11.0 mmol) was added at rt and the reaction mixture was stirred at 80° C. overnight. The reaction mixture was concentrated under vacuum and the resulting crude product was purified by flash chromatography (50% EtOAC in pet ether) to afford the title compound (yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.75 (s, 2H), 6.90 (s, 1H), 6.85-6.83 (d, J=7.6 Hz, 1H), 6.75 (d, J=7.6 Hz, 1H), 6.05 (d, J=2.8 Hz, 1H), 5.91 (d, J=2.8 Hz, 1H), 4.28-4.23 (q, J=7.2 Hz, 2H), 3.82-3.81 (m, 4H), 3.49 (q, J=6.8 Hz, 1H), 2.55-2.44 (m, 2H), 2.43-2.33 (m, 2H), 1.29-1.24 (m, 6H). LCMS: (Method A) 385 (M+H), Rt. 3.23 min, 94.1% (Max). HPLC: (Method A) Rt. 3.23 min, 99.14% (Max).

Example 52: (2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)methanol

(271) ##STR00074##

(272) The title compound was synthesized following general procedure A from Example 51. The crude product was purified by flash chromatography (30% EtOAc in pet ether) to afford the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.27 (s, 2H), 6.89 (s, 1H), 6.84 (d, J=8 Hz, 1H), 6.75 (d, J=8.0 Hz, 1H), 5.99 (m, 2H), 5.05 (t, =5.2 Hz, 1H), 4.30 (d, J=5.2 Hz, 2H), 3.67 (s, 4H), 3.36-3.34 (m, 1H), 2.43-3.32 (m, 4H), 1.27 (d, J=6.8 Hz, 3H). LCMS: (Method A) 343.0 (M+H), Rt. 2.16 min, 95.05% (Max). HPLC: (Method A) Rt. 2.11 min, 97.35% (Max)

Example 53: 2-(4-(1-(2,3-dihydrobenzofuran-5-yl)ethyl]piperazin-1-yl)pyrimidine

(273) ##STR00075##

(274) To a solution of 2-(piperazin-1-yl)pyrimidine (0.8 g, 4.8 mmol), diisopropylethylamine (3.0 mL, 5.7 mmol) in ACN (20 mL), Intermediate 5 (1.04 g, 5.7 mmol) was added at rt and the resulting mixture was stirred overnight. It was diluted with water (5 mL) and extracted with DCM (2×50 mL). The combined organic layer was dried over Na.sub.2SO.sub.4 and concentrated under vacuum. The crude product was purified by MD Autoprep (Method B) to afford the title compound (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.31 (d, J=4.8 Hz, 2H), 7.16 (s, 1H), 6.99 (d, J=8.4 Hz, 1H), 6.67 (d, J=8.0 Hz, 1H), 6.58 (t, J=4.8 Hz, 1H), 4.48 (t, J=8.8 Hz, 2H), 3.67 (m, 4H), 3.34 (t, J=6.8 Hz, 1H), 3.14 (m, 2H), 2.42-2.38 (m, 2H), 2.35-2.31 (m, 2H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 311.2 (M+H), Rt. 2.511 min, 98.68% (Max)

(275) HPLC: (Method A) Rt. 2.52 min, 99.82% (Max).

Example 54: N-(4-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-2-yl)acetamide

(276) ##STR00076##

(277) To a stirred solution of Example 46 (0.35 g, 1.0 mmol) in dry DCM (3.5 mL), pyridine (0.2 mL, 2.1 mmol), acetic anhydride (0.12 mL, 1.3 mmol) and DMAP (0.006 g, 0.5 mmol) were added at rt. The resulting mixture was stirred for 5 h at rt and overnight at 50° C. it was diluted with ethyl acetate (100 mL) and washed with HCl (1.5N), water, brine, dried over Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude product was purified by MD Autoprep (Method C) to afford the title compound (off white solid). .sup.1H NMR (400 MHz, MeOH-d.sub.6): δ 7.99 (s. 1H), 6.88 (s, 1H), 6.77 (s, 2H), 6.54 (br. s, 1H), 5.93 (s, 2H), 3.71 (s, 4H), 3.40 (q, J=6.8 Hz, 1H), 2.61-2.57 (m, 2H), 2.51-2.47 (m, 2H), 2.24 (s, 3H), 1.38 (d, J=6.8 Hz, 3H). LCMS: (Method A) 370.2 (M+H), Rt, 1.88 min, 95.01% (Max). HPLC: (Method A) Rt. 1.83 min, 98.7% (Max).

Example 55: 1-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)-4-(5-nitropyridin-2-yl)piperazine

(278) ##STR00077##

(279) To a stirred solution of Intermediate 2 (0.2 g, 2.1 mmol), Et.sub.3N (1.2 mL, 8.5 mmol) In dry DMF (5 mL), 2-chloro-5-nitropyridine (0.44 g, 2.8 mmol) was added at rt. The resulting mixture was stirred at 120° C. for 20 h. The completion of the reaction was monitored by TLC. The reaction mixture was diluted with water (10 mL) and extracted with EtOAc (25 mL). The organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude product was purified by flash chromatography to afford the title compound (yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.93 (d, J=2.8 Hz, 1H), 8.19 (dd, J=9.6, 2.8 Hz, 1H), 6.91-6.89 (m, 2H), 6.85 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 5.99 (br s, 2H), 3.73 (s, 4H), 3.40 (q, J=6.4 Hz, 1H), 2.41-2.38 (m, 4H), 1.29 (d, J=6.4 Hz, 3H). LCMS: (Method A) 357.0 (M+H), Rt. 2.98 min, 96.03% (Max). HPLC: (Method A) Rt. 3.03 min, 95.35% (Max).

Example 56: (R)-2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-methylthiazole-4-carboxamide or (S)-2-(4(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-methylthiazole-4-carboxamide

(280) ##STR00078##

(281) The two enantiomers of Example 30 were separated by chiral preparative HPLC (Method PG). The first eluting compound has a Rt. 15.74 min (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.99 (q, J=4.8 Hz, 1H), 7.34 (s, 1H), 6.90 (d, J=1.2 Hz, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.76 (dd, J=8.0, 1.2 Hz, 1H), 5.99 (s, 2H), 3.50-3.42 (m, 5H), 2.72 (d, J=4.8 Hz, 3H), 2.50-2.49 (m, 4H), 1.29 (d, J=6.8 Hz, 3H). LCMS: (Method A) 375 (M+H), Rt. 2.35 min, 98.15% (Max). HPLC: (Method A) Rt. 2.38 min, 97.08% (Max), 96.58% (254 nm). Chiral HPLC: (Method E) Rt. 15.74 min, 100.00%. Example 56 corresponds to the second eluting compound, with Rt. 28.85 min (white solid). .sup.1HNMR (400 MHz, DMSO-d.sub.6): δ 7.99 (q, J=4.8 Hz, 1H), 7.34 (s, 1H), 6.90 (d, J=1.2 Hz, 1H), 6.85 (d, J=7.6 Hz, 1H), 6.76 (dd, J=8.0, 1.2 Hz, 1H), 5.99 (s, 2H), 3.50-3.41 (m, 5H), 2.72 (d, J=4.8 Hz, 3H), 2.50-2.43 (m, 4H), 1.29 (d, J=6.8 Hz, 3H). LCMS: (Method A) 375.0 (M+H), Rt. 2.34 min, 99.94% (Max). HPLC: (Method A) Rt. 2.37 min, 99.77% (Max). Chiral HPLC: (Method E) Rt. 28.85 miry, 100.00%

Example 57: (R)-2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N-methylthiazole-4-carboxamide or (S)-2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N-methylthiazole-4-carboxamide

(282) ##STR00079##

(283) The two enantiomers of Example 50 were separated by chiral preparative HPLC (Method PG). The first eluting compound has a Rt. 16.29 min (yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.98 (q, J=4.4 Hz, 1H), 7.34 (s, 1H), 6.81-6.74 (m, 3H), 4.22 (s, 4H), 3.42-3.39 (m, 5H), 2.73 (d, J=4.8 Hz, 3H), 2.48-2.41 (m, 4H), 1.27 (t, J=6.4 Hz, 3H). LCMS: (Method A). 389.0 (M+H), Rt. 2.40 min, 99.14% (Max). HPLC: (Method A) Rt. 2.36 min, 99.63% (Max). Chiral HPLC: (Method E) Rt, 16.29 min, 100% (max). Example 57 corresponds to the second eluting compound, with Rt. 33.49 min (yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.98 (d, J=4.4 Hz, 1H), 7.34 (s, 1H), 6.81-6.74 (m, 3H), 4.21 (s, 4H), 3.42-3.37 (m, 5H), 2.73 (d, J=4.8 Hz. 3H), 2.46-2.41 (m, 4H), 1.26 (t, J=6.4 Hz, 3H). LCMS: (Method A). 389.0 (M+H), Rt. 2.34 min, 98.58% (Max). HPLC: (Method A) Rt. 2.37 min, 99.28% (Max). Chiral HPLC: (Method E) Rt. 33.49 min, 99.66% (max).

Example 58: 6-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyridin-3-amine

(284) ##STR00080##

(285) To a stirred solution of Example 55 (0.20 g, 5.6 mmol) in methanol (4.0 mL), Pd/C (0.02 g, 10% w/w) was added at rt and the mixture was stirred overnight under hydrogen atmosphere (5 Kg/cm.sup.2) at rt. The reaction mixture was filtered through celite and washed with methanol (10 mL). The organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulted crude product was purified by MD Autoprep (Method C) to afford the title compound (dark oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.57 (d, J=2.8 Hz, 1H), 6.90-6.88 (m, 2H), 6.84 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 6.57 (d, J=8.8 Hz, 1H), 5.98 (m, 2H), 4.55 (s, 2H), 3.33 (br m. 1H), 3.18 (s, 4H), 2.38-2.36 (m, 4H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 327.2 (M+H), Rt. 1.85 min, 98.76% (Max), HPLC: (Method A) Rt. 1.81 min, 99.66% (Max).

Example 59 and Example 60: (R)-2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-ethylthiazole-5-carboxamide and (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-ethylthiazole-5-carboxamide

(286) ##STR00081##

Step 1: Lithium 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylate

(287) To a stirred solution of Example 27 (1.8 g, 3.86 mmol) in THF (14 mL) MeOH (4 mL) and H.sub.2O (2 mL) was added LiOH.H.sub.2O (395 mg, 9.65 mmol). The reaction mixture was stirred at 50° C. for 3 h. The completion of the reaction was monitored by TLC. The reaction mixture was concentrated under vacuum. The resulting crude product was suspended in toluene and the solvents were evaporated again. It was used in the next step without any further purification. Yield: 89% (1.5 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.8): δ 7.73 (s, 1H), 6.88-6.82 (m, 2H), 6.75-6.73 (m, 1H), 5.97 (s, 2H), 3.67-3.32 (m, 5H), 2.87-2.59 (m, 4H), 1.32-1.15 (m, 3H). LCMS: (Method A) 362.0 (M+H), Rt. 2.26 min, 88.6% (Max).

Step 2: (R)-2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-ethylthiazole-5-carboxamide and (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-ethylthiazole-5-carboxamide

(288) To a stirred solution of lithium 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylate (500 mg, 1.33 mmol) in DMF (10 mL), DIPEA (0.7 mL, 3.99 mmol), ethyl amine (2 M in THF, 1 mL, 2.00 mmol) and HATU (607 mg, 1.60 mmol) were added at 0° C. The reaction mixture was stirred at room temperature overnight. The reaction mixture was concentrated under vacuum and diluted with DCM. It was washed with water, brine and dried over anhydrous Na.sub.2SO.sub.4, The crude product was purified by flash chromatography. Both enantiomers were separated by chiral preparative HPLC (Method PF). Example 59 corresponds to the first eluting compound with a Rt. 17.99 min (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.19 (1, J=5.6 Hz, 1H), 7.74 (s, 1H), 6.90 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.76 (d, J=6.4 Hz, 1H), 5.99 (s, 2H), 3.21-3.17 (m, 2H), 2.48-2.39 (m, 4H), 1.28 (d, J=6.4 Hz, 3H), 1.07 (t, J=7.2 Hz, 3H). LCMS: (Method A) 389.2 (M+H), Rt. 2.47 min, 97.4% (Max). HPLC: (Method A) Rg. 2.43 min, 99.9% (Max). Chiral HPLC: (Method D) Rt. 17.99 min, 100.00%. Example 60 corresponds to the second eluting compound with a Rt. 19.92 min (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.19 (t, J=5.6 Hz, 1H), 7.74 (s, 1H), 6.90 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.76 (d, J=6.8 Hz, 1H), 5.99 (s, 2H), 3.21-3.17 (m, 2H), 2.48-2.33 (m, 4H), 1.28 (d, J=6.8 Hz, 3H), 1.07 (t, J=7.2 Hz, 3H). LCMS: (Method A) 389.0 (M+H), Rt. 2.46 min, 99.3% (Max). HPLC: (Method A) Rt. 2.43 min, 99.9% (Max). Chiral HPLC: (Method D) Rt. 19.92 min, 100.00%.

Example 61: (R)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N,N-dimethylthiazole-5-carboxamide or (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N,N-dimethylthiazole-5-carboxamide

(289) ##STR00082##

(290) The two enantiomers of Example 47 were separated by chiral preparative HPLC (Method PF). The first eluting compound has a Rt. 14.07 min (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.58 (s, 1H), 6.90 (s, 1H), 6.85 (s, 1H), 6.76 (s, 1H), 5.99 (s, 2H), 3.44-3.42 (m, 5H), 3.07 (br m, 6H), 2.47-2.39 (m, 4H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 389.0 (M+H), Rt. 2.39 min, 99.5% (Max). HPLC: (Method A) Rt. 2.37 min, 99.6% (Max). Chiral HPLC: (Method D) Rt. 14.07 min, 100.00%. Example 61 corresponds to the second eluting compound with Rt. 16.06 min (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.58 (s, 1H), 6.90 (s, 1H), 6.85 (s, 1H), 6.76 (s, 1H), 5.99 (s, 2H), 3.44-3.42 (m, 5H), 3.07 (br m, 6H), 2.50-2.39 (m, 4H), 1.28 (d, J=6.4 Hz, 3H). LCMS: (Method A) 389.2 (M+H), Rt. 2.44 min, 95.3% (Max). HPLC: (Method A) Rt. 2.37 min, 99.9% (Max). Chiral HPLC: (Method D) Rt. 16.06 min, 99.7%.

Example 62: (S)-2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N-ethylthiazole-5-carboxamide or (R)-2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N-ethylthiazole-5-carboxamide

(291) ##STR00083##

Step 1: Ethyl 2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylate

(292) To a stirred solution of Intermediate 4 (3.4 g, 11.94 mmol) in dry DMF (50 mL), ethyl 2-bromothiazole-5-carboxylate (Example 27, Step 1, 2.8 g, 11.94 mmol) and TEA (5.0 mL, 35.82 mmol) were added at 0° C. The resulting mixture was stirred at 120° C. overnight. It was cooled to rt, diluted with EtOAc, washed with water, brine, dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude product was purified by flash chromatography to afford the title compound. Yield: 64% (3.1 g, pale brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.81 (s, 1H), 6.79-6.74 (m, 3H), 4.19-4.14 (m, TH), 3.48-3.32 (m, 4H), 2.42-2.36 (m, 4H), 1.26-1.19 (m, 6H). LCMS: (Method A) 404.0 (M+H), Rt. 3.19 min, 96.5% (Max).

Step 2: Lithium 2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylate

(293) The title compound was synthesized according to the protocol described for Example 60, Step 1, using ethyl 2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylate as starting material. The resulting product was used in the next step without further purification. Yield: 86% (2.5 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.16 (s, 1H), 6.79-6.72 (m, 3H), 4.20 (s, 4H), 3.34-3.29 (m, 5H), 2.44-2.28 (m, 4H), 1.24 (d, J=8.8 Hz, 3H). LCMS: (Method A) 376.0 (M+H), Rt. 2.34 min, 97.4% (Max).

Step 3: (S)-2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N-ethylthiazole-5-carboxamide or (R)-2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N-ethylthiazole-5-carboxamide

(294) The title compound was synthesized according to the protocol described for Example 60, Step 2, using lithium 2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylate as starting material. The crude mixture was purified by flash chromatography followed by chiral preparative HPLC (Method PE) to separate both enantiomers. The first fraction was concentrated to give Example 62 (Rt. 19.00 min) (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.19 (t, J=5.2 Hz, 1H), 7.74 (s, 1H), 6.81-6.74 (m, 3H), 4.22 (s. 4H), 3.42-3.35 (m, 5H), 3.22-3.16 (m, 2H), 2.50-2.33 (m, 4H), 1.27 (d, J=6.8 Hz, 3H), 1.07 (1, J=7.2 Hz, 3H). LCMS: (Method A) 403.0 (M+H) Rt. 2.50 min, 98.4% (Max). HPLC: (Method A) Rt. 2.47 min, 98.2% (Max). Chiral HPLC: (Method A) Rt. 19.00 min, 100%. The second enantiomer had a Rt. 29.37 min (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.19 (t, J=5.6 Hz, 1H), 7.74 (s, 1H), 6.81-6.74 (m, 3H), 4.22 (s, 4H), 3.42-3.37 (m, 5H), 3.22-3.17 (m, 2H), 2.50-2.41 (m, 4H), 1.27 (d, J=6.4 Hz, 3H), 1.07 (t, J=7.2 Hz, 3H). LCMS: (Method A) 403.2 (M+H) Rt. 2.51 min, 99.6% (Max). HPLC: (Method A) Rt. 2.47 min, 98.9% (Max). Chiral HPLC: (Method A) Rt. 29.37 min, 100%.

Example 63 and Example 64: (R)-2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N,N-dimethylthiazole-5-carboxamide and (S)-2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N,N-dimethylthiazole-5-carboxamide

(295) ##STR00084##

(296) The title compounds were synthesized according to the protocol described for Example 59 and Example 60, Step 2, using lithium 2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylate (Example 62, Step 2) and dimethyl amine as starting material. The crude mixture was purified by flash chromatography. Both enantiomers were separated by chiral preparative HPLC (Method PF). The first fraction corresponds to Example 63 (Rt. 17.78 min) (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.58 (s, 1H), 6.81-6.75 (m, 3H), 4.22 (s, 4H), 3.44-3.38 (m, 5H), 3.06 (br. s, 6H), 2.47-2.39 (m, 4H), 1.27 (d, J=6.8 Hz, 3H). LCMS: (Method A) 403.0 (M+H), Rt. 2.42 min, 99.3% (Max). HPLC: (Method A) Rt. 2.41 min, 99.6% (Max). Chiral HPLC: (Method D) Rt. 17.78 min, 100.00%. The second fraction corresponds to Example 64 (Rt. 21.09 min) (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.58 (s, 1H), 6.81-6.77 (m, 3H), 4.22 (s, 4H), 3.44-3.38 (m, 5H), 3.12-2.99 (m, 6H), 2.46-2.39 (m, 4H), 1.27 (d, J=6.40 Hz, 3H). LCMS: (Method A) 403.0 (M+H), Rt. 2.43 min, 99.8% (Max). HPLC: (Method A) Rt. 2.40 min, 99.8% (Max). Chiral HPLC: (Method D) Rt. 21.09 min, 97.38%.

Example 65 and Example 66: (R)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-methylthiazole-5-carboxamide and (S)-2-(4-(1-benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-methylthiazole-5-carboxamide

(297) ##STR00085##

(298) The title compounds were synthesized according to the procedure described for Example 59 and Example 60 using methyl amine (2M in THF) as reagent. The crude mixture was purified by flash chromatography followed by chiral preparative HPLC (Method PF) to separate enantiomers. The first fraction was concentrated to give Example 65 (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.16 (d, J=4.4 Hz, 1H), 7.72 (s, 1H), 6.89 (s, 1H), 6.85 (d, J=7.6 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 5.99 (br s, 2H), 3.43-3.42 (m, 5H), 2.69 (d, J=4.4 Hz, 3H), 2.47-2.33 (m, 4H), 1.28 (d, J=6.4 Hz 3H). LCMS: (Method A) 375.0 (M+H), Rt. 2.23 min, 99.0% (Max). HPLC: (Method A) Rt. 2.19 min, 99.6% (Max). Chiral HPLC: (Method D) Rt. 15.48 min, 98.91%.

(299) The second fraction was concentrated to give Example 66 (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.16 (q, J=4.8 Hz, 1H), 7.72 (s, 1H), 6.90 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 5.99 (br s, 2H), 3.43-3.41 (m, 5H), 2.69 (d, J=4.8 Hz, 3H), 2.48-2.39 (m, 4H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 375.0 (M+H), Rt. 2.23 min, 97.4% (Max). HPLC: (Method A) Rt. 2.19 min, 96.9% (Max). Chiral HPLC: (Method D) Rt. 18.44 min, 100.00%

Example 67: (2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-5-yl)(morpholino)methanone

(300) ##STR00086##

(301) The title compound was synthesized according to the procedure described for Example 59 and Example 60 using morpholine as reagent. Both enantiomers were not separated in this example (pale brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.55 (s, 1H), 6.90 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.76 (d, J=7.6 Hz, 1H), 5.99 (s, 2H), 3.61 (br m, 8H), 3.45-3.42 (m, 5H), 2.47-2.40 (m, 4H), 1.29 (d, J=6.4 Hz, 3H). LCMS: (Method A) 431.0 (M+H), Rt. 2.41 min, 98.6% (Max). HPLC: (Method A) Rt. 2.38 min, 97.1% (Max).

Example 68 and Example 69: (R)—N-(5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)acetamide and (S)—N-(5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)acetamide

(302) ##STR00087##

(303) To a stirred solution of Example 41 (0.6 g, 1.8 mmol) in dry DCM (10 mL), acetic anhydride (0.22 mL, 2.3 mmol) and DIPEA (0.615 mL, 3.6 mmol) were added at 0° C. and the reaction mixture was stirred at room temperature for 4 h. It was concentrated under vacuum and the crude product was purified by recrystallization followed by enatiomer separation by SFC. The first fraction was collected as Example 68 (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 11.66 (br s, 1H), 6.89 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 5.99 (m, 2H), 3.42-3.34 (m, 5H), 2.51-2.50 (m, 2H), 2.43-2.33 (m, 2H), 2.09 (s, 3H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 376.0 (M+H), Rt. 2.27 min, 97.4% (Max). HPLC: (Method A) Rt. 2.29 min, 98.2% (Max). HPLC chiral purity: (Method D) Rt. 24.02 min, 99.3% (Max). The second fraction was collected as Example 69 (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 11.66 (br s. 1H), 6.89 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.76 (dd, J=8.0, 1.2 Hz, 1H), 5.99 (m, 2H), 3.41-3.34 (m, 5H), 2.55-2.47 (m, 2H), 2.43-2.39 (m, 2H), 2.09 (s, 3H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 376.0 (M+H), Rt. 2.28 min, 95.8% (Max). HPLC: (Method A) Rt. 2.29 min, 97.1% (Max). HPLC chiral purity: (Method D) Rt. 26.57 min, 97.5% (Max), Alternatively, Example 69 can be synthesized according to the following protocol:

Example 69: (S)—N-(5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)acetamide

(304) ##STR00088##

(305) To a stirred solution of Example 132 (102.0 g, 305.9 mmol) in THE (500 mL), pyridine (120.8 g, 1529.9 mmol) and acetic anhydride (33.9 g, 333.0 mmol) were added at 0° C. and the resulting mixture was stirred at rt for 1.0 h.

(306) Completion of the reaction was confirmed by TLC. Reaction mixture was evaporated under vacuum at 50° C. Water (200 mL) was added and the resulting suspension was stirred for 15 miry at rt and filtered. The filtration cake was washed with water (2×100 mL), hexane (2×200 mL) and Et.sub.2O (2×200 mL). The crude product was heated in Et.sub.2O (500 mL), cooled down to rt and filtered. The filtration cake was washed with Et.sub.2O (100 mL) and dried under vacuum at 40° C. to afford the title compound. Yield: 67% (76.0 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 12.01 (s, 1H), 6.89 (d, J=1.2 Hz, 1H), 6.83 (d, J=7.9 Hz, 1H), 6.74 (dd, J=7.9, 1.0 Hz, 1H), 5.98-5.97 (m, 2H), 3.38 (q, J=6.7 Hz, 1H), 3.34-3.31 (m, 4H), 2.49-2.40 (m, 4H), 2.01 (s, 3H), 1.26 (d, J=6.7 Hz, 3H). .sup.13C NMR (400 MHz, DMSO-d.sub.6): δ168.2, 167.7, 150.6, 147.7, 146.5, 137.5, 121.0, 108.2, 108.0, 101.2, 63.7, 49.6, 49.6, 49.3, 49.3, 22.6, 19.7. LCMS: (Method A) 376.0 (M+H), Rt. 2.37 min, 99.56% (Max), 99.35% (254 nm). HPLC: (Method A) Rt. 2.20 min, 99.65% (Max), 99.34% (254 nm). Chiral HPLC: (Method D) Rt. 26.87 min, 100%. Optical Rotation: [α].sup.28.sub.D −59.78, c 1.0 (CHCl.sub.3). Melting Point: 220.8-221.8° C.

(307) The invention also relates to a compound of formula 69, having a chemical purity of higher than 98%, preferably higher than 99%, even more preferably higher than 99.5% and/or an enantiomeric excess of higher than 98%, preferably higher than 99%, even more preferably higher than 99.5%. The physical data of such compound are presented in FIGS. 7, 8, 9 and 10 of this application.

Example 70: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-amine

(308) ##STR00089##

Step 1: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-nitropyrimidine

(309) To a stirred solution of Intermediate 2 (1 g, 4.2 mmol) in dry DMF (10 mL), Et.sub.3N (2.3 mL, 16.8 mmol) and 2-chloro-5-nitropyrimidine (0.74 g, 4.6 mmol) were added at rt and the resulting mixture was stirred at 120° C. for 20 h. It was diluted with water and extracted with EtOAc. The organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude product was purified by flash chromatography to give the title compound (yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.08 (s, 2H), 6.92 (s, 1H), 6.85-6.83 (m, 1H), 6.77 (s, 1H), 5.98 (m, 2H), 3.89 (s, 4H), 3.50 (s, 1H), 2.45-2.44 (m, 4H), 1.30 (br s, 3H). LCMS: (Method A) 358.0 (M+H), Rt. 3.00 min, 94.23% (Max).

Step 2: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-amine

(310) To a stirred solution of 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-nitropyrimidine (0.70 g, 1.9 mmol) in methanol (14 mL), Pd/C (0.07 g, 10% w/w) was added at rt and the resulting mixture was stirred under hydrogen atmosphere (5 kg/cm.sup.2) overnight at rt. The reaction mixture was filtered through celite and washed with methanol. The filtrate was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The crude product was purified by flash chromatography to afford the title compound (yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.86 (s, 2H), 6.88 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.75 (d, J=7.6 Hz, 1H), 6.46 (s, 2H), 5.98 (m, 2H), 3.48-3.45 (m, 4H), 2.43-2.42 (m, 2H), 2.34-2.31 (m, 2H), 1.27 (d, J=6.8 Hz, 3H). LCMS: (Method A) 328.2 (M+H), Rt. 1.91 min, 96.83% (Max). HPLC: (Method A) Rt. 1.88 min, 95.85% (Max).

Example 71: (R)-2-(4-(1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N-(2-(dimethylamino)ethyl)-N-methylthiazole-5-carboxamide or (S)-2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N-(2-(dimethylamino)ethyl)-N-methylthiazole-5-carboxamide

(311) ##STR00090##

(312) The title compound was synthesized according to the procedure described for Example 62, using N,N,N trimethyl ethylene diamine as reagent. The crude product was purified by flash chromatography, followed by chiral preparative HPLC using (Method PF) to separate both enantiomers. The first eluting compound had Rt. 14.56 min (pale brown oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.57 (s, 1H), 6.80-6.73 (m, 3H), 4.21 (s, 4H), 3.52 (t, J=6.4 Hz, 2H), 3.50-3.38 (m, 5H), 3.16-3.11 (m, 3H), 2.56-2.50 (m, 1H), 2.49-2.38 (m, 5H), 2.32-2.10 (m, 6H), 1.26 (d, J=6.8 Hz, 3H), LCMS: (Method A) 460.2 (M+H), Rt. 2.12 min, 95.2% (Max). HPLC: (Method A) Rt. 2.02 min, 96.9% (Max). Chiral HPLC: (Method D) Rt. 14.56 min, 97.43%. The second eluting compound corresponds to Example 71 (Rt, 16.81 min) (pale brown oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.56 (s, 1H), 6.80-6.73 (m, 3H), 4.21 (s, 4H), 3.50 (t, J=6.8 Hz, 2H), 3.48-3.36 (m, 5H), 3.09 (br. s, 3H), 2.55-2.50 (m, 1H), 2.49-2.38 (m, 5H), 2.13 (s, 6H), 1.26 (d, J=6.8 Hz, 3H). LCMS: (Method A) 460.2 (M+H), Rt. 2.13 min, 95.4% (Max). HPLC: (Method A) Rt. 2.03 min, 97 5% (Max). Chiral HPLC: (Method D) Rt. 16.81 min, 98.36%.

Example 72: N-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)acetamide

(313) ##STR00091##

(314) To a stirred solution of Example 70 (180 mg, 0.54 mmol) in dry pyridine (1.35 mL), acetic anhydride (0.06 mL, 0.65 mmol) was added at room temperature and the resulting mixture was stirred at 50° C. overnight. It was diluted with ethyl acetate (100 mL) and washed with HCl (1.5 N), water, brine and dried over Na.sub.2SO.sub.4, After evaporation of the solvents, the crude product was purified by flash chromatography to afford the title compound (yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.82 (s, 1H), 8.46 (d, J=0.4 Hz, 2H), 6.89 (s, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.76 (d, J=7.6 Hz, 1H), 5.98 (m, 2H), 3.64-3.62 (m, 4H), 3.36-3.34 (m, 1H), 2.45-2.32 (m, 4H), 2.00 (s, 3H), 1.25 (d, J=6.8 Hz, 3H). LCMS: (Method A) 370.2 (M+H), Rt. 2.30 min, 94.42% (Max). HPLC: (Method A) Rt. 2.22 min, 95.29% (Max).

Example 73: (2-(4-(1-(2,3-(dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-vi)thiazol-5-yl)(4-hydroxypiperidin-1-yl)methanone

(315) ##STR00092##

Step 1: 1-(2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-5-carbonyl) piperidin-4-on e

(316) The title compound was synthesized according to the same procedure as described for Example 62 using piperidine-4-one, hydrochloride, mono hydrate as starting material (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.61 (s, 1H), 6.81-6.77 (m, 3H), 4.22 (s, 41-4), 3.89 (t, J=6.1 Hz, 4H), 3.71 (t, 0.1=6.1 Hz, 1H), 3.60 (t, J=4.2 Hz, 4H), 2.34-2.33 (m, 8H), 1.27 (d, J=6.7 Hz, 3H). LCMS: (Method A) 457.0 (M+H), Rt. 2.42 min, 90.5% (Max).

Step 2: (2-(4-(1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazol-5-yl)(4-hydroxypiperidin-1-yl)methanone

(317) To a stirred solution of 1-(2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-5-carbonyl)piperidin-4-one (480 mg, 1.0 mmol) in dry MeOH (100 mL), NaBH.sub.4 (59 mg, 1.5 mmol) was added slowly at 0° C. The reaction mixture was stirred at room temperature for 2 h. It was then concentrated under vacuum and the resulting crude product was dissolved in DCM, washed with water, brine and dried over anhydrous Na.sub.2SO.sub.4. The solvent was removed under reduced pressure to get the title compound. Yield: 69% (325 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.48 (s, 1H), 6.80-6.73 (m, 3H), 4.78 (br. s, 1H), 4.21 (s, 4H), 3.92-3.88 (m, 2H), 3.72 (br s, 1H), 3.42-3.35 (m, 4H), 3.33-3.25 (m, 2H), 2.46-2.38 (m, 4H), 1.75-1.74 (m, 2H), 1.34-1.31 (m, 2H), 1.25 (d, J=6.8 Hz, 3H). LCMS: (Method A) 459.0 (M+H), Rt. 2.32 min, 95.8% (Max). HPLC: (Method A) Rt. 2.33 min, 97.7% (Max).

Example 74 and Example 75: (R)-(2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazol-5-yl)(4-methylpiperazin-1-yl)methanone and (S)-(2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazol-5-yl)(4-methylpiperazin-1-yl)methanone

(318) ##STR00093##

(319) The title compounds were synthesized according to the same procedure as described for Example 62, using N-methyl piperazine as starting material. The crude mixture was purified by column chromatography followed by chiral preparative HPLC using (Method PF) to separate both enantiomers. The first eluting fraction was concentrated to give Example 74 (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.52 (s, 1H), 6.81-6.77 (m, 3H), 4.22 (s, 4H), 3.60 (br. s, 4H), 3.43-3.38 (m, 5H), 2.45-2.33 (m, 8H), 2.19 (s, 3H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 458.2 (M+H), Rt. 2.02 min, 99.2% (Max). HPLC: (Method A) Rt. 2.01 min, 99.7% (Max). Chiral HPLC: (Method D) Rt. 14.95 min, 98.36%. The second eluting fraction was concentrated to give Example 75 (pale brown oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ7.52 (s, 1H), 6.81-6.74 (m, 3H), 4.22 (s, 4H), 3.60-3.59 (m, 4H), 3.43-3.37 (m, 5H), 2.50-2.31 (m, 8H), 2.19 (s, 3H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 458.2 (M+H), Rt. 2.02 min, 98.3% (Max). HPLC: (Method A) Rt. 2.01 min, 99.2% (Max). Chiral HPLC: (Method D) Rt. 17.10 min, 97.39%.

Example 77 and Example 78: (R)—N-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)acetamide and (S)—N-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)acetamide

(320) ##STR00094##

(321) Example 72 was submitted to chiral preparative HPLC (Method PD), The first eluting fraction was concentrated, affording Example 77 (pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.81 (s, 1H), 8.46 (s, 2H), 6.89 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 5.98 (m, 2H), 3.63 (t, J=4.8 Hz, 4H), 3.31 (s, 1H), 2.44-2.33 (m, 4H), 2.00 (s, 3H), 1.26 (d, J=6.0 Hz, 3H). LCMS: (Method A) 370.2 (M+H), Rt. 2.33 min, 99.5% (Max). HPLC: (Method A) Rt. 2.24 min, 99.7% (Max). Chiral HPLC: (Method F) Rt. 31.24 min, 99.05%. The second eluting fraction was concentrated, affording Example 78 (pale yellow solid). 1H NMR (400 MHz, DMSO-d.sub.6: b 9.81 (s, 1H), 8.46 (s, 2H), 6.89 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 5.98 (m, 2H), 3.63 (t, J=4.8 Hz, 4H), 3.31 (s, 1H), 2.41-2.32 (m, 4H), 2.00 (s, 3H), 1.26 (d, J=6.0 Hz, 3H). LCMS: (Method A) 370.2 (M+H), Rt. 2.31 min, 99.5% (Max). HPLC: (Method A) Rt. 2.25 min. 99.8% (Max). Chiral HPLC: (Method F) Rt. 21.26 min, 100.00%.

Example 79: 4-((2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-5-yl)methyl)morpholine

(322) ##STR00095##

Step 1: (2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-5-yl)methanol

(323) To a stirred solution of Example 27 (6.0 g, 16.4 mmol) in dry THE (70 mL), Super hydride (65 mL, 65.0 mmol) was added slowly at 0° C. The reaction mixture was stirred at rt for 2 h. The reaction mixture was quenched with saturated NH.sub.4Cl and extracted with ethyl acetate. The organic layer was separated, dried over anhydrous Na.sub.2SO.sub.4, concentrated under vacuum. The crude product was purified by silica gel column chromatography (10% MeOH in DCM) to afford the title compound (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.93 (s, 1H), 6.87-6.84 (d, J=12.8 Hz, 1H), 6.81-6.75 (m, 1H), 6.74-6.72 (d, J=8.8 Hz, 1H), 5.96-5.96 (d, J=1.2 Hz, 2H), 5.18-5.16 (d, J=7.8 Hz, 1H), 3.41-3.28 (m, 3H), 2.52-2.37 (m, 8H), 2.25 (s, 1H). LCMS; (Method A) 348.0 (M+H), Rt. 1.95 min, 97.02% (Max),

Step 2: 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-5-(chloromethyl)thiazole

(324) To a stirred solution of (2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-5-yl)methanol (4.0 g, 11.5 mmol) in DCM (50 mL), SOCl.sub.2 (1.6 mL, 23.0 mmol) was added slowly at 0° C. and the resulting mixture was stirred at rt for 1 h. It was concentrated under vacuum. The resulting crude product was taken for next step reaction without further purification. Yield: 96% (4.8 g, Yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 11.69 (s, 1H), 7.36-7.33 (m, 1H), 7.13-6.98 (m, 2H), 6.07 (s, 2H), 4.46 (d, J=12.8 Hz, 2H), 4.04-3.69 (m, 4H), 3.54-3.27 (m, 1H), 3.12-292 (m, 3H), 1.69 (d, J=6.0 Hz, 3H). LCMS: (Method A) 363 (M+H), Rt. 2.49 min, 86.01% (Max).

Step 3: 4-((2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-5-yl)methyl)morpholine

(325) To a stirred solution of 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-5-(chloromethyl)thiazole (0.8 g, 2.0 mmol) in dry ACN (20 mL), DIPEA (1.8 mL, 8.0 mmol) and morpholine (0.22 mL, 2.4 mmol) were added and the reaction mixture was stirred at rt overnight. The reaction mixture was diluted with EtOAc and washed with water. It was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The crude product was purified by flash chromatography (10% MeOH in DCM) to afford the title compound (pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.95 (s, 1H), 6.88 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.75 (d, J=8.0 Hz, 1H), 5.99 (m, 21-), 3.54-3.53 (m, 4H), 3.48 (s, 2H), 3.39 (q, J=6.8 Hz, 1H), 3.25-3.40 (m, 4H), 2.40-2.33 (m, 4H), 1.28-1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 418.0 (M+H), Rt. 1.99 min, 97.82% (Max). HPLC: (Method A) Rt. 1.78 min, 95.19% (Max).

Example 80: N-((2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-5-yl)methyl)-N-methylacetamide

(326) ##STR00096##

Step 1: 1-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-5-yl)-N-methylmethanamine

(327) To a stirred solution of 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-5-(chloromethyl)thiazole (Example 79, Step 3, 1.2 g, 3.1 mmol) in dry ACN (20 mL), DIPEA (2.3 mL, 12.4 mmol) and methyl amine (5.0 mL, 9.3 mmol, 2 M in THF) were added dropwise. The resulting mixture was stirred at rt overnight. It was diluted with water and extracted with ethyl acetate. The organic layer was separated, dried over anhydrous Na.sub.2SO.sub.4, concentrated under vacuum. The crude product was purified by flash chromatography (10% MeOH in DCM) to afford the title compound (yellow solid). LCMS: (Method A) 362.0 (M+H), Rt. 1.96 min, 25.6% (Max).

Step 2: N-((2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-5-yl)methyl)-N-methylacetamide

(328) To a stirred solution of 1-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-5-yl)-N-methylmethanamine (0.1 g, 0.27 mmol), DIPEA (0.3 mL, 0.8 mmol) in dry DCM (10 mL), acetic anhydride (0.3 mL, 0.8 mmol) was added portion wise and the reaction mixture was stirred at rt for 12 h. It was quenched with water (10 mL) and extracted with ethyl acetate (25 mL). The organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude product was purified by flash chromatography (10% MeOH in DCM) to afford the title compound (pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.05 (d, J=9.6 Hz, 1H), 6.88 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.75 (d, J=8.0 Hz, 11-1), 5.99-5.98 (m, 2H), 4.40 (s, 2H), 3.39 (q, J=6.0 Hz, 1H), 3.33-3.30 (m, 4H), 2.88 (s, 3H), 2.50-2.37 (m, 4H), 1.97 (s, 3H), 1.27 (d, J=6.8 Hz, 3H). LCMS: (Method A) 403.0 (M+H), Rt. 2.19 min, 97.19% (Max). HPLC: (Method A) Rt. 2.14 min, 98.5% (Max).

Example 81: (R)-(2-(4-(1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazol-5-yl)(4-hydroxypiperidin-1-yl)methanone or (S)-(2-(4-(1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazol-5-yl)(4-hydroxypiperidin-1-yl)methanone

(329) ##STR00097##

(330) The two enantiomers of Example 73 were separated by chiral preparative HPLC, (Method PH). The first eluting compound had Rt. 32.84 min (pale brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.49 (s, 1H), 6.79-6.77 (m, 3H), 4.78 (br. s, 1H), 4.22 (s, 4H), 3.93-3.90 (m, 2H), 3.73-3.72 (m, 1H), 3.42-3.38 (m, 5H), 3.34-3.28 (m, 2H), 2.50-2.39 (m, 4H), 1.78-1.74 (m, 2H), 1.38-1.26 (m, 5H). LCMS: (Method A) 459.0 (M+H), Rt. 2.32 min, 95.9% (Max). HPLC: (Method A) Rt. 2.21 min, 94.4% (Max), Chiral HPLC: (Method B) Rt. 32.84 min, 100%. The second eluting compound was isolated as Example 81 with Rt. 36.77 min (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.49 (s, 1H), 6.80-6.74 (m, 3H), 4.78 (br. s, 1H), 4.22 (s, 4H), 3.94-3.88 (m, 2H), 3.74-3.72 (m, 1H), 3.43-3.38 (m, 5H), 3.33-3.26 (m, 2H), 2.50-2.39 (m, 4H), 1.78-1.74 (m, 2H), 1.36-1.32 (m, 2H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 459.0 (M+H), Rt. 2.32 min, 98.9% (Max). HPLC: (Method A) Rt. 2.23 min, 99.8% (Max). Chiral HPLC: (Method B) Rt. 36.77 min, 94.52%.

Example 84: (2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-4-yl)methanamine

(331) ##STR00098##

Step 1: 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-(chloromethyl)thiazole

(332) To a stirred solution of Example 29 (1 g, 2.88 mmol) in dry DCM at 0° C., thionylchloride (0.4 mL, 8.64 mmol, spectrochem) was added dropwise. The reaction mixture was stirred at rt for 2 h. It was then concentrated and the resulting crude product was used without further purification. Yield: quantitative (1.2 g, pink solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.73-7.35 (m, 1H), 7.31-6.95 (m, 2H), 6.05 (s, 2H), 5.74 (s, 1H), 5.01-4.96 (m, 1H), 4.46 (s, 1H), 3.97-3.58 (m, 4H), 3.35-3.07 (m, 4H), 1.21 ((d, J=8.8 Hz, 3H). LCMS: (Method A) 362.0 (M−H), Rt. 2.45 min, 77.9% (Max),

Step 2: 4-(azidomethyl)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole

(333) To a stirred solution of 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-(chloromethyl)thiazole (1.2 g, 3.28 mmol) in dry DCM at 0° C., sodium azide (0.32 g, 4.9 mmol, spectrochem) was added in portion. The resulting mixture was heated at 80° C. for 12 h. It was then concentrated. The residue was dissolved in DCM (50 mL), washed with water (15 mL) and dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was used without further purification. Yield: (1.1 g, colorless liquid). LCMS: (Method A) 373.0 (M+H), Rt. 2.96 min, 78.9% (Max).

Step 3: (2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-4-ylmethanamine

(334) To a stirred solution of 4-(azidomethyl)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazole (1.1 g, 2.95 mmol) in THE (18 mL) and water (2 mL), triphenylphosphine (1.16 g, 4.4 mmol, spectrochem) was added in portion and the resulting mixture was heated at 60° C. for 12 h. The reaction mixture was concentrated in a vacuum. The residue was dissolved in DCM (25 mL), washed with water (10 mL) and dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by MD Autoprep (Method B) (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.8): δ 6.88 (t, J=2.4 Hz, 2H), 6.86-6.83 (m, 1H), 6.75 (d, J=8.0 Hz, 1H), 5.98 (m, 2H), 3.70 (s, 2H), 3.40 (t, J=6.8 Hz, 1H), 3.33-3.28 (m, 4H), 2.42-2.37 (m, 4H), 1.90 (s, 2H), 1.26 (d, J 6.8 Hz, 3H). LCMS: (Method A) 347.0 (M+H), Rt. 2.59 min, 98.65% (Max). HPLC: (Method A) Rt. 1.86 min, 98.9% (Max).

Example 85: N-((2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-4-yl)methyl)acetamide

(335) ##STR00099##

(336) To a solution of Example 84 (0.08 g, 0.23 mmol) in dry dichloromethane (5 mL), pyridine (0.01 mL, 0.11 mmol, spectrochem) and acetic anhydride (0.01 mL, 0.11 mmol, spectrochem) were added and the resulting mixture was stirred at rt for 12 h. It was concentrated. The crude residue was dissolved in DCM (15 mL), washed with water (5 mL) and dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by MD Autoprep (Method C) (off white solid). .sup.1H NMR (400 MHz, CDCl.sub.3): δ 7.00 (s, 1H), 6.90 (s, 1H), 6.77 (s, 2H), 5.97 (s, 2H), 5.77 (s, 1H), 4.43 (d, J=4.6 Hz, 2H), 3.48 (t, J=3.6 Hz, 5H), 2.56 (s, 4H), 2.00 (s, 3H), 1.41 (s, 3H). LCMS: (Method A) 389.2 (M+H), Rt. 2.02 min, 94.37% (Max). HPLC: (Method A) Rt. 1.94 min, 92.8% (Max).

Example 86: N-(5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-2-yl)acetamide

(337) ##STR00100##

Step 1: 5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-2-amine

(338) The title compound was synthesized following the general procedure D, using Intermediate 2 and 2-amino-5-bromo thiazole, hydrobromide salt as starting materials. Yield: 66% (0.85 g, black solid). LCMS: (Method A) 333.0 (M+H), Rt. 1.99 min, 57.8% (Max).

Step 2: N-(5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-2-yl)acetamide

(339) The title compound was synthesized via same procedure as described for Example 44, using 5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)thiazol-2-amine as starting material (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ11.68 (s, 11-t), 6.89 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.76 (d, J=7.6 Hz, 1H), 6.57 (s, 1H), 5.99 (s, 2H), 3.38-3.33 (m, 1H), 3.02-2.92 (m, 4H), 2.50-2.43 (m, 4H), 2.06 (s, 3H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 375.0 (M+H), Rt. 2.49 min, 97.9% (Max). HPLC: (Method A) Rt. 2.41 min, 97.5% (Max).

Example 96: N-(2-(4-(1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)acetamide

(340) ##STR00101##

(341) To a stirred solution of Intermediate 10 (320 mg, 1.24 mmol) in dry ACN (5 mL), DIPEA (3.66 mL, 20.28 mmol) and Intermediate 3 (270 mg, 1.36 mmol) were added and the reaction mixture was stirred at 80° C. overnight. It was concentrated under vacuum and the crude product was dissolved in EtOAc (30 mL), washed with water (10 mL) and dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by flash chromatography to afford the title compound (pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.79 (s, 1H), 8.44 (s, 2H), 6.76-6.74 (m, 3H), 4.19 (s, 4H), 3.61 (s, 4H), 2.38-2.31 (m, 4H), 1.98 (s, 3H), 1.24 (d, J=6.4 Hz, 3H), LCMS: (Method A) 384.2 (M+H), Rt. 2.27 min, 99.82% (Max). HPLC: (Method A) Rt. 2.26 min, 98.35% (Max).

Example 97: N-(5-(4-(1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)acetamide

(342) ##STR00102##

(343) The title compound was synthesized according the same procedure as Example 96, using Intermediate 7 and Intermediate 3 as starting materials. The crude product was purified by flash chromatography followed by MD Autoprep (Method B) to give the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 12.02 (s, 1H), 6.80-6.74 (m, 3H), 4.21 (s, 4H), 3.37-3.33 (m, 5H), 2.43-2.39 (m, 4H), 2.09 (s, 3H), 1.26 (d, J=6.8 Hz, 3H). LCMS: (Method A) 390.0 (M+H), Rt. 2.39 min, 98.62% (Max). HPLC: (Method A) Rt. 2.27 min, 97.05% (Max).

Example 98: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-methylpyrimidine-5-carboxamide

(344) ##STR00103##

Step 1: Ethyl 2-(methylthio)pyrimidine-5-carboxylate

(345) To a stirred solution of ethyl-4-chloro-(2-methyl thio pyrimidine) 5-carboxylate (10 g, 42.9 mmol) in THF/water (8:2, 100 mL), zinc powder (14.0 g, 0.21 mmol) followed by t-BuOH (2 mL) were added and the resulting mixture was heated at 90° C. for overnight. The reaction completion was monitored by LCMS. The mixture was filtered through celite and evaporated under vacuum. The crude product was dissolved in dichloromethane (100 mL), washed with water (50 mL) and dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by MD Autoprep (Method B) (colorless liquid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): 9.03 (s. 2H), 4.35 (q, J=7.1 Hz, 2H), 2.58 (s, 314). 1.33 (t, J=7.08 Hz, 3H). LCMS: (Method A) 199.0 (M+H), Rt. 3.50 min, 99.7% (Max).

Step 2: Ethyl 2-(methylsulfonyl)pyrimidine-5-carboxylate

(346) To a stirred solution of ethyl 2-(methylthio)pyrimidine-5-carboxylate (2.8 g, 14.2 mmol) in tetrahydrofuran at 0° C., 3-chloroperbenzoic acid (7.8 g, 60.7 mmol, spectrochem) was added and the resulting solution was stirred at rt for 3 h. It was concentrated. DCM was added and was washed with water (25 mL) and 10% sodium bicarbonate solution (20 mL) and dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by flash chromatography to afford the titled product. Yield: 50.7% (1.65 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): 9.48 (s, 2H), 4.43 (q, J=7.0 Hz, 2H), 3.48 (s, 3H), 1.37 (t, J=7.1 Hz, 3H), LCMS: (Method A) 230.9 (M+H), Rt. 2.33 min, 97.48% (Max).

Step 3: Ethyl 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1 yl)pyrimidine-5-carboxylate

(347) To a stirred solution of Intermediate 2 (1.87 g, 6.94 mmol) in dry acetonitrile, potassium carbonate (2.87 g, 20.8 mmol, spectrochem) and ethyl 2-(methylsulfonyl)pyrimidine-5-carboxylate were added and the resulting mixture was at rt for 12 h. It was filtered through celite and concentrated. Dichloromethane (25 mL) was added and the solution was washed with water, brine and dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by flash column chromatography to afford the title compound (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): 8.74 (s, 2H), 6.85 (t, J=7.8 Hz, 2H), 6.75 (d, J=7.8 Hz, 1H), 5.98 (s, 2H), 4.25 (q J=6.8 Hz, 2H), 3.81 (s, 4H), 3.32 (s, 1H), 2.37-2.42 (m, 4H), 1.28 (d, J=6.6 Hz, 6H). LCMS: (Method A) 385.2 (M+H), Rt. 3.22 min, 98.88% (Max).

Step 4: Lithium 2-(4-(1-(benzo[d])[1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidine-5-carboxylate

(348) To a stirred solution of ethyl 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidine-5-carboxylate (0.9 g, 2.34 mmol) in MeOH (2 mL), THE (7 mL) and water (1 mL) mixture, lithium hydroxide (0.24 g, 5.85 mmol, spectrochem) was added at 0° C. The resulting mixture was stirred at rt for 12 h. It was concentrated and the crude product was used without further purification. Yield: 90% (0.52 g, off white solid). LCMS: (Method A) 357.0 (M+H), Rt. 2.38 min, 99.21% (Max).

Step 5: 2-(4-(1-(Benzo[d][1,3]dioxol-5-yl) ethyl)piperazin-1-yl)-N-methylpyrimidine-5-carboxamide

(349) To a stirred solution of lithium 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1 yl)pyrimidine-5-carboxylate (300 mg, 0.82 mmol) in dry DMF (5 mL), methyl amine (0.09 mL, 0.988 mmol, 2M in THF). DIPEA (0.45 mL, 2.47 mmol) and HATU (471 mg, 1.29 mmol) were added and the resulting mixture was stirred at rt for 12 h. It was concentrated under vacuum and the crude product was diluted with DCM (20 mL), washed with water (15 mL) and dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by MD Autoprep (Method B) to give the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.71 (s, 2H), 8.29 (q, J=4.4 Hz, 1H), 6.90 (d, J=1.6 Hz, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.75 (dd, J=8.0, 1.2 Hz, 1H), 5.98 (m, 2H), 3.78-3.76 (m, 4H), 3.39 (q, J=6.4 Hz, 1H), 2.74 (d, J=4.8 Hz, 3H), 2.45-2.42 (m, 2H), 2.37-2.32 (m, 2H), 1.28 (d, J=6.4 Hz, 3H). LCMS: (Method A) 370.2 (M+H), Rt. 2.24 min, 97.69% (Max). HPLC: (Method A) Rt. 2.19 min, 99.52% (Max).

Example 99: 2-(4(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N,N-dimethylpyrimidine-5-carboxamide

(350) ##STR00104##

(351) The title compound was synthesized according the same protocol as Example 98, using dimethyl amine (2 M in THF) as reagent. The crude product was purified by MD Autoprep (Method B) to afford the title compound (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.45 (s, 2H), 6.90 (d, J=1.2 Hz, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.75 (dd, J=8.0, 1.2 Hz, 1H), 5.98 (m, 2H), 3.77-3.74 (m, 4H), 3.39 (q, J=6.4 Hz, 1H), 2.97 (s, 6H), 2.47-2.42 (m, 2H), 2.38-2.33 (m, 2H), 1.28 (d, J=6.4 Hz, 3H). LCMS: (Method A) 384.0 (M+H), Rt. 2.51 min, 99.94% (Max). HPLC: (Method A) Rt. 2.35 min, 99.85% (Max).

Example 105: N-(5-(4(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)propionamide

(352) ##STR00105##

(353) To a stirred solution of Example 41 (310 mg, 1.2 mmol) in dry DCM (10 mL), TEA (0.4 mL, 2.78 mmol) and propionyl chloride (94 mg, 1.02 mmol) were added at 0° C. and the resulting mixture was stirred at rt overnight. The reaction mixture was concentrated under vacuum and the resulting crude product was purified by flash chromatography to give the title compound (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 11.96 (s, 1H), 6.83 (s, 1H), 6.83 (d, J=8.0 Hz, 1H), 6.72 (d, J=8.0 Hz, 1H), 5.98 (m, 2H), 3.34-3.32 (m, 5H), 2.51-2.37 (m, 6H), 1.28 (d, J=6.8 Hz, 3H), 1.04 (d, J=7.2 Hz, 3H). LCMS: (Method A) 390.0 (M+H), Rt. 2.57 min, 99.27% (Max). HPLC: (Method A) Rt. 2.48 min, 99.7% (Max).

Example 106: N-(5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)butyramide

(354) ##STR00106##

(355) The title compound was synthesized according the same protocol as described for the synthesis of Example 105, using butyryl chloride as acylating agent. The resulting crude product was purified by flash column chromatography followed by MD Autoprep (Method B) to give the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ11.98 (s, 1H), 6.89 (d, J=1.6 Hz, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.76 (dd, J=8.0, 1.6 Hz, 1H), 5.98 (m, 2H), 339 (q, J=5.6 Hz, 1H), 3.35-3.33 (m, 4H), 2.56-2.40 (m, 4H), 2.36 (t, J=7.6 Hz, 2H), 1.61-1.55 (m, 2H), 1.28 (d, J=6.4 Hz, 3H), 0.86 (t, J=7.2 Hz, 3H). LCMS: (Method A) 404.2 (M+H), Rt. 2.81 min, 97.58% (Max). HPLC: (Method A) Rt. 2.84 min, 99.12% (Max).

Example 107: N-(5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)isobutyramide

(356) ##STR00107##

(357) The title compound was synthesized according the same protocol as described for the synthesis of Example 105, using isobutryl chloride as acylating agent. The crude product was purified by flash chromatography to give the title compound (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 11.99 (s, 1H), 6.89 (d, J=1.2 Hz, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.76 (dd, J=8.0, 1.2 Hz, 1H), 5.99 (m, 2H), 3.43 (q, J=6.8 Hz, 1H), 3.80-3.33 (m, 4H), 2.72-2.65 (m, 1H), 2.44-2.32 (m, 4H), 1.28 (d, J=6.8 Hz, 3H), 1.09 (d, J=6.8 Hz, 6H). LCMS: (Method A) 404.2 (M+H), Rt. 2.82 min, 98.33% (Max). HPLC: (Method A) Rt. 2.75 min, 99.73% (Max).

Example 108: N-(5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)cyclo propanecarboxamide

(358) ##STR00108##

(359) The title compound was synthesized according the same protocol as described for the synthesis of Example 105, using cyclopropane carbonyl chloride as acylating agent. The crude product was purified by flash chromatography followed by MD Autoprep (Method B) to give the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 12.30 (s, 1H), 6.89 (d, J=1.6 Hz, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.76 (dd, J=8.0, 1.6 Hz, 1H), 5.99 (m, 2H), 3.39 (q, J=6.4 Hz, 1H), 3.33-3.28 (m, 4H), 2.56-2.39 (m, 4H), 1.88-1.87 (m, 1H), 1.28 (d, J=6.4 Hz, 3H), 0.90-0.83 (m, 4H). LCMS: (Method A) 402.2 (M+H), Rt 2.63 min, 99.66% (Max). HPLC: (Method A) Rt. 2.66 min, 99.76% (Max).

Example 109: 2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)-N-methylthiazole-5-carboxamide

(360) ##STR00109##

(361) To a stirred solution of lithium 2-(4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)ethyl)piperazin-1-yl)thiazole-5-carboxylate (0.7 g, 18.37 mmol, Example 6, Step 2) in dry DMF (7 mL), methyl amine (2M in THF, 1.3 mL, 27.55 mmol), HATU (0.83 g, 22.0 mmol) and DIPEA (0.9 mL, 55.1 mmol) were added and the reaction mixture was stirred overnight at rt. It was cooled to rt and concentrated. Water (15 mL) was added to the resulting mixture and was extracted with EtOAc (2×30 mL). The organic layer was dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by MD Autoprep HPLC (Method B) to afford the title compound as off white solid. .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.14 (q, J=4.0, 1H), 7.70 (s, 1H), 6.77-6.74 (m, 3H), 4.40 (s, 4H), 3.39-3.38 (m, 5H), 2.67 (d, J=4.4 Hz, 3H), 2.49-2.48 (m, 2H), 2.44-2.38 (m, 2H), 1.25 (d, J=6.4 Hz, 3H). LCMS: (Method A) 389.2 (M+H), Rt. 2.26 min, 97.94% (Max). HPLC; (Method A) Rt. 2.23 min, 98.53% (Max),

Example 110: N-(5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)-4-chlorobenzamide

(362) ##STR00110##

(363) To a stirred solution of Example 41 (0.40 g, 1.2 mmol) in dry DCM (10 mL), TEA (0.4 mL, 0.45 mmol) and 4-chlorobenzoyl chloride (0.28 g, 1.65 mmol) were added at 0° C. and the resulting mixture was stirred overnight at rt. It was concentrated under vacuum and the resulting crude product was purified by flash chromatography to give the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): 12.69 (s, 1H), 8.06 (d, J=8.4 Hz, 2H), 7.60 (d, J=8.8 Hz, 2H), 6.75-6.89 (m, 3H), 5.99 (t, J=0.4 Hz, 2H), 3.39-3.42 (m, 5H), 2.42-2.45 (m, 4H), 1.28 (d, J=6.80 Hz, 3H), LCMS (Method A) 471.1 (M+H), Rt. 3.59 min, 98.8% (Max). HPLC: (Method A) Rt. 3.56 min, 98.7% (Max)

Example 111: 5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-(4-chlorobenzyl)-1,3,4-thiadiazol-2-amine

(364) ##STR00111##

(365) To a stirred solution of Example 41 (0.3 g, 0.90 mmol) in dry 1,2-dichloroethane (3 mL), titanium isopropoxide (0.8 mL, 2.71 mmol) and 4-chlorobenzaldehyde (0.19 g, 1.35 mmol) were added and the reaction mixture was refluxed for 8 h. It was cooled to 0° C. and sodium borohydride (0.17 g, 4.51 mmol) was added and the mixture was stirred at rt for 2 h. It was concentrated and water (15 mL) was added to the resulting crude product. It was extracted with EtOAc (2×30 mL). The organic layer was dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by MD Autoprep HPLC (Method B) to afford the title compound as off white solid. .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.58 (t, J=6.0 Hz, 1H), 7.39-7.32 (m, 4H), 6.86 (s, 1H), 6.83 (d, J=8.0 Hz, 1H), 6.73 (d, J=8.0 Hz, 1H), 6.97-6.97 (m, 2H), 4.33 (m, 2H), 3.32-3.21 (m, 1H), 3.19-3.16 (m, 4H), 2.43-2.21 (m, 4H), 1.25 (d, J=6.4 Hz, 3H). LCMS: (Method B) 458.0 (M+H). Rt. 6.16 min, 96.93% (Max). HPLC: (Method A) Rt. 3.21 min, 96.02% (Max).

Example 112: 5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-ethyl-1,3,4-thiadiazol-2-amine

(366) ##STR00112##

(367) The title compound was synthesized following the same procedure as Example 111, using acetaldehyde (0.17 mL, 1.35 mmol) as starting material. After evaporation of the solvents, the crude product was purified by flash chromatography to afford the title compound as off white solid. .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.99 (t, J=5.2 Hz, 1H), 6.88 (d, J=1.2 Hz, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.74 (dd, J=7.6, 1.2 Hz, 1H), 5.99-5.98 (m, 2H), 3.37 (d, J=6.4 Hz, 1H), 3.19-3.13 (m, 6H), 2.45-2.32 (m, 4H), 1.25 (d, J=6.4 Hz, 3H), 1.11 (t, d, J=6.8 Hz, 3H). LCMS: (Method A) 362.0 (M+H), Rt. 2.01 min, 96.31% (Max). HPLC: (Method A) Rt. 1.98 min, 94.56% (Max).

Example 128: N-(5-(4(1-(2,3-dihydrobenzofuran-6-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)acetamide

(368) ##STR00113##

(369) The title compound was synthesized according the protocol used for Example 114, using Intermediate 7 (0.3 g, 1.14 mmol) and Intermediate 21 (0.269 g, 1.48 mmol) as starting materials. The crude product was purified by flash chromatography (7% MeOH in DCM) followed by MD Autoprep HPLC (Method B) to give the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 12.02 (s, 1H), 7.12 (d, J=7.2 Hz, 1H), 6.76 (d, J=87.6 Hz, 1H), 6.71 (s, 1H), 4.51 (t, J=8.4 Hz, 2H), 3.39-3.28 (m, 5H), 3.14 (t, J=8.4 Hz, 2H), 2.42-2.39 (m, 4H), 2.09 (s, 3H), 1.28 (d, J=6.4 Hz, 3H). LCMS: (Method A) 374.2 (M+H), Rt. 2.34 min, 99.62% (Max). HPLC: (Method A) Rt. 2.32 min 96.03% (Max).

Example 129: N-(2-(4(1-(2,3-dihydrobenzofuran-6-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)acetamide

(370) ##STR00114##

(371) The title compound was synthesized according the protocol used for Example 114, using Intermediate 10 (0.3 g, 1.16 mmol) and Intermediate 21 (0.274 g, 1.51 mmol) as starting materials. The crude product was purified by flash chromatography (10% MeOH in DCM) followed by MD Autoprep HPLC (Method B) to give the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.80 (s, 1H), 8.45 (s, 2H), 7.13 (d, J 7.6 Hz, 1H), 6.75-6.70 (m, 1H), 4.49 (t, J=8.4 Hz, 2H), 3.63-3.61 (m, 4H), 3.12 (t, J=8.4 Hz, 3H), 2.44-2.30 (m, 4H), 1.99 (s, 3H), 1.26 (d, J=6.4 Hz, 3H). LCMS: (Method A) 368.3 (M+H), Rt. 2.34 min, 99.74% (Max). HPLC: (Method A) Rt. 2.33 min, 99.52% (Max).

Example 132: (S)-5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-amine

(372) ##STR00115##

(373) To a stirred solution of Intermediate 16 (3 g. 11.1 mmol) in ACN (30 mL), TEA (3.36 g, 33.3 mmol) and 5-bromo-1,3,4-thiadiazol-2-amine (2.19 g, 12.2 mmol) were added at rt and the mixture was heated at 85° C. overnight. The completion of the reaction was confirmed by TLC. The reaction mixture was evaporated under vacuum and the resulting crude solid was diluted with water (30 mL) and extracted with EtOAc (3×30 mL). The combined organic layer was washed with brine (30 mL), dried over Na.sub.2SO.sub.4 and evaporated at 45° C. under vacuum. The crude product was purified by flash chromatography (7% MeOH in DCM) to give the title compound (pale brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.88-6.83 (m, 2H), 6.76-6.74 (m, 1H), 6.46 (s, 2H), 5.91 (d, J=1.6 Hz. 2H), 3.39-3.37 (m, 1H), 3.20-3.17 (m, 4H), 2.46-2.30 (m, 4H), 1.25 (d, J=6.5 Hz, 3H). LCMS: (Method A) 334.0 (M+H), Rt. 1.85 min, 96.47% (Max). HPLC: (Method A) Rt. 1.79 min, 96.77% (Max). Chiral HPLC: (Method D) Rt. 20.96 min, 100.00%

Example 134: (S) 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-methylpyrimidine-5-carboxamide

(374) ##STR00116##

Step 1: Ethyl (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidine-5-carboxylate

(375) To a stirred solution of Intermediate 16 (1.87 g, 6.94 mmol) in dry acetonitrile (10 mL), potassium carbonate (2.87 g, 20.8 mmol, Spectrochem) and ethyl 2-(methylsulfonyl) pyrimidine-5-carboxylate (1.6 g, 6.94 mmol, synthesis described in Example 98, steps 1 and 2) were added. The resulting mixture was stirred at rt for 3 h. It was then filtered through celite and concentrated. The crude product was diluted with dichloromethane (25 mL), washed with water and dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvent, the crude product was purified by flash column chromatography to afford the title compound (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.74 (s. 1H), 6.78-6.72 (m, 2H), 5.97 (s, 1H), 4.38-4.36 (m, 1H), 3.81 (s, 2H), 2.37-2.47 (m, 9H), 1.26 (d, J=2.84 Hz, 3H), LCMS: (Method A) 385.2 (M+H), Rt. 3.22 min, 98.6% (Max).

Step 2: Lithium (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidine-5-carboxylate

(376) To a stirred solution of ethyl (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidine-5-carboxylate (1.6 g, 17.5 mmol) in a mixture of MeOH (2 mL), THF (7 mL) and water (1 mL), lithium hydroxide (0.431 g, 5.20 mmol, Spectrochem) was added at 0° C. and the resulting mixture was stirred at rt for 12 h. It was concentrated and the resulting product was taken for next step without any further purification. Yield: 96% (0.61 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.61 (s, 1H), 6.81-6.88 (m, 4H), 5.97 (d, J=1.8 Hz, 2H), 3.68 (d, J=6.2 Hz, 2H), 3.22-3.21 (m, 1H), 2.28-2.35 (m, 6H), 1.26 (d, J=8.9 Hz, 3H), LCMS: (Method A) 357.0 (M+H), Rt. 2.41 min, 97.1% (Max)

Step 3: (S) 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-methylpyrimidine-5-carboxamide

(377) To a stirred solution of lithium (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidine-5-carboxylate (0.3 g, 0.82 mmol) in dry DCM (10 mL), triethylamine (0.34 mL) and methylamine in THF (2 M, 1.6 ml., 3.32 mmol) were added at 0° C. The reaction mixture was stirred at rt for 1 h. The reaction progression was monitored by TLC. After completion of the reaction, the mixture was diluted with 10% sodium bicarbonate solution (10 mL) and extracted with DCM (20 mL). The organic layer was dried over Na.sub.2SO.sub.4 and evaporated to dryness. The crude product was purified by flash column chromatography. Yield: 56% (0.17 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.8): δ 8.71 (s, 2H), 8.28 (d, J=4.8 Hz, 1H), 6.90-6.83 (m, 2H), 6.77-6.75 (m, 1H), 5.98 (d, J=2.0 Hz, 2H), 3.77 (t, J=4.8 Hz, 4H), 3.41-3.38 (m, 1H), 2.74 (d, J=4.4 Hz, 3H), 2.38-2.33 (m, 4H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 370.2 (M+H), Rt. 2.21 min, 98.9% (Max). HPLC: (Method A) Rt. 2.18 min, 99.3% (Max). Chiral HPLC: (Method G) Rt. 5.51 min, 100.00%

Example 137: (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N,N-dimethylpyrimidine-5-carboxamide

(378) ##STR00117##

(379) The title compound was synthesized using the same procedure as described for Example 134, using lithium (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1 yl)pyrimidine-5-carboxylate and N,N-dimethyl amine as solution in THF as starting materials. The crude product was purified by flash column chromatography (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.45 (s, 2H), 6.90 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.74 (d, J=7.6 Hz, 1H), 5.98 (d, J=1.6 Hz, 2H), 3.76 (t, J=4.8 Hz, 4H), 3.39-3.37 (m, 1H), 2.97 (s, 6H), 2.44-2.43 (m, 2H), 2.37-2.35 (m, 2H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 384.2 (M+H), Rt. 2.44 min, 98.2% (Max). HPLC: (Method A) Rt. 2.44 min, 98.3% (Max). Chiral HPLC: (Method G) Rt. 6.98 min, 100.00%

Example 141: (S)-5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-ethyl-1,3,4-thiadiazol-2-amine

(380) ##STR00118##

(381) To a stirred solution of Example 132 (0.7 g, 2.1 mmol) in THF (14 mL), acetaldehyde (0.84 mL, 5M in THF) and titanium(IV)ethoxide (0.958 g, 4.2 mmol) were added and the resulting mixture was stirred at rt overnight. The completion of the reaction was confirmed by TLC. The reaction mixture was cooled to 0° C. and sodium borohydride (0.238 g, 6.3 mmol) was added. The reaction mixture was stirred 2 h at rt. It was quenched with water (10 mL) and filtered through celite. The celite bed washed with EtOAc (2×50 mL) and the filtrate was washed with water (10 mL), brine (10 mL), dried over Na.sub.2SO.sub.4. It was evaporated at 50° C. under vacuum. The crude product was purified by MD Autoprep HPLC (Method D) to give the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.98 (t, J=5.2 Hz, 2H), 6.88 (d, J=1.2 Hz, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.75 (dd, J=8.0, 1.2 Hz, 1H), 5.99-5.98 (m, 2H), 3.37 (q, J=6.8 Hz, 2H), 3.20-3.14 (m, 6H), 2.47-2.36 (m, 4H), 1.26 (d, J=6.8 Hz, 3H), 1.11 (t, J=7.2 Hz, 3H). LCMS: (Method A) 362.0 (M+H), Rt. 2.01 min, 99.75% (Max). HPLC: (Method A) Rt. 2.02 min, 97.69% (Max). Chiral HPLC: (Method B) Rt. 3.90 min, 100%

Example 142: (S)-5-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethylpiperazin-1-yl)-N-propyl-1,3,4-thiadiazol-2-amine

(382) ##STR00119##

(383) To a stirred solution of Example 132 (0.5 g, 1.5 mmol) in THE (10 mL), propionaldehyde (0.17 g, 3.0) and titanium(IV)ethoxide (0.684 g, 3.0 mmol) were added at rt and stirred overnight. The completion of the reaction was confirmed by TLC. The reaction mixture was cooled to 0° C. and sodium borohydride (0.17 g, 4.4 mmol) was added. The reaction mixture was stirred for 2 h at rt. It was quenched with water (10 mL) and filtered through celite. The celite bed washed with EtOAc (2×50 mL) and the filtrate was washed with water (10 mL), brine solution (10 mL) and dried over Na.sub.2SO.sub.4. It was evaporated at 50° C. under vacuum. The crude product was purified by MD Autoprep HPLC (Method D) to give the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.02 (t, J=5.2 Hz, 2H), 6.88 (d, J=1.6 Hz, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.75 (dd, J=7.6, 1.6 Hz, 1H), 5.99-5.98 (m, 2H), 3.41 (q, J=6.4 Hz, 2H), 3.20-3.17 (m, 4H), 3.11-3.06 (m, 2H), 2.45-2.32 (m, 4H), 1.56-1.47 (m, 2H), 1.26 (d, J=6.4 Hz, 3H), 0.86 (t, J=7.6 Hz, 3H). LCMS: (Method A) 376.0.0 (M+H), Rt. 2.23 min, 99.08% (Max). HPLC: (Method A) Rt. 2.21 min, 97.11% (Max). Chiral HPLC: (Method B) Rt. 3.61. min, 100%.

Example 144: 2-(4(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-methylthiazole

(384) ##STR00120##

Step 1; tert-Butyl 4-(4-methylthiazol-2-yl)piperazine-1-carboxylate

(385) To a stirred solution of tert-butyl 4-carbamothioylpiperazine-1-carboxylate (synthesized according to Example 5, Step 1, 1.0 g, 4.08 mmol) in dioxane (10 mL), TEA (0.58 g, 5.3 mmol) and bromo acetone (0.67 mL, 5.3 mmol) were added at rt and the resulting mixture was stirred at 90° C. for 16 h. The completion of the reaction was monitored by TLC. The reaction mixture was diluted with water (10 mL) and extracted with EtOAc (2×25 mL). The organic layer was dried over anhydrous Na.sub.2SO.sub.4, concentrated under vacuum. The crude product was taken as such for next step. Yield: 77% (0.9 g, pale yellow solid). LCMS: (Method A) 284.0 (M+H), Rt. 2.74 min, 83.2% (Max).

Step 2: 4-Methyl-2-(piperazin-1-yl)thiazole hydrochloride

(386) To a stirred solution of tert-butyl 4-(4-methylthiazol-2-yl)piperazine-1-carboxylate (1.0 g. 3.53 mmol) in dry dioxane (2 mL), HCl in dioxane (4 N, 10 mL) was added at rt and the resulting mixture was stirred for 3 h. It was concentrated under vacuum and the resulting crude product was triturated in Et.sub.2O, filtrated and dried under vacuum to afford the title compound. Yield: 75% (500 mg, off white solid).

Step 3: 2-(4(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-methylthiazole

(387) The title compound was synthesized by following general procedure D, using 4-methyl-2-(piperazin-1-yl)thiazole hydrochloride (1.01 g, 5.41 mmol) and Intermediate 1 (1.0 g 5.41 mmol), The crude product was purified by flash chromatography (1.2-1.5% MeOH in DCM) to afford the title compound (colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 6.88 (s, 1H), 6.83 (d, J=8.0 Hz, 1H), 6.75 (d, J=7.6 Hz, 1H), 6.34 (s, 1H), 5.97 (s, 2H), 3.39-3.37 (m, 1H), 3.32-3.29 (m, 4H), 2.46-2.43 (m, 2H), 2.41-2.37 (m, 2H), 2.10 (s, 1H), 1.26 (d, J=6.8 Hz, 3H). LCMS: (Method A) 332.0 (M+H), Rt. 2.04 min, 99.1% (Max). HPLC: (Method A) Rt. 2.02 min, 99.6% (Max).

Example 148: 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-6,7-dihydrothiazolo[5,4-c]pyridin-4(5H)-one

(388) ##STR00121##

(389) To a stirred solution of Intermediate 25 (0.75 g, 2.43 mmol) in dry DMF (7 mL), TEA (1.4 mL, 7.30 mmol) and Intermediate 1 (0.9 g, 4.87 mmol) were added at rt. The resulting mixture was stirred overnight at 120° C. It was cooled to rt and DMF was evaporated under reduced pressure. Resulting crude product was purified by flash column chromatography followed by MD Autoprep HPLC (Method B), affording the title product (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.32 (s, 1H), 6.86-6.84 (m, 3H), 5.99-5.98 (m, 2H), 3.45-3.44 (m, 4H), 3.38-3.34 (m, 2H), 2.70-2.67 (m, 2H), 2.50-2.59 (m, 4H), 1.28-1.23 (m, 3H). LCMS: (Method A) 387.2 (M+H), Rt. 2.15 min, 96.71% (Max). HPLC: (Method A) Rt. 2.11 min, 94.32% (Max).

Example 166: (S)-1-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)-4(5-(trifluoromethyl)pyridin-2-yl)piperazine

(390) ##STR00122##

(391) To a stirred solution of Intermediate 16 (0.25 g, 0.93 mmol) in dry DMF (5 mL), TEA (0.4 mL, 2.7 mmol) and 2-chloro-5-fluoro methyl pyridine (0.16 g, 9.3 mmol) were added at rt. The resulting reaction mixture was stirred at 90° C. for 12 h. It was cooled to rt, concentrated and diluted with dichloromethane (30 mL). The resulting solution was washed with saturated NaCl solution (10 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated. The resulting crude product was purified by flash chromatography affording the title compound (brown oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.38 (s, 1H), 7.78 (dd, J=9.2, 2.4 Hz, 1H), 6.88 (d, J=8.0 Hz, 2H), 6.84 (d, J=8.0 Hz, 1H), 6.77-6.75 (m, 1H), 5.99-5.98 (m, 2H), 3.60 (t, J=4.8 Hz, 4H), 3.40-3.37 (m, 1H), 2.45-2.44 (m, 4H), 1.27 (d, J=6.4 Hz, 3H). LCMS: (Method A) 380.0 (M+H), Rt. 3.73 min, 98.89% (Max). HPLC: (Method A) Rt. 3.67 min, 99.06% (Max).

Example 167: (S)-1-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)ethan-1-one

(392) ##STR00123##

Step 1: 1-(2-chloropyrimidin-5-yl)ethan-1-one

(393) 5-Bromo 2-chloro pyrimidine (2 g, 10.33 mmol, Combi-Blocks) was degassed for 30 min. 1-Ethoxy vinyl tributyltin (4.1 mL, 11.3 mmol, Frontier Scientific) and bis(triphenylphosphine)palladium dichloride (0.36 g, 0.51 mmol) were added at rt. The resulting mixture was stirred overnight at 90° C. It was cooled to rt and filtered through celite. An aqueous HCl solution (6 N, 10 mL) was added and the mixture was stirred for 1 hour at rt. It was neutralized with sat.NaHCO.sub.3 solution (15 mL), extracted with DCM (50 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated. The crude product was purified by flash column chromatography to afford the title compound (pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.90 (s, 2H), 2.65 (s, 3H). LCMS: (Method B) 162.0 (M+H), Rt. 4.6 min, 98.01% (Max).

Step 2: (S)-1-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)ethan-1-one

(394) To a stirred solution of Intermediate 16 (1.14 g, 4.24 mmol) in dry DMF (10 mL), TEA (1.1 mL, 16.5 mmol) and 1-(2-chloropyrimidin-5-yl)ethan-1-one obtained in the previous step (0.6 g, 3.85 mmol) were added at rt. The resulting mixture was heated to 90° C. for 12 h. It was cooled to rt and concentrated. Dichloromethane (50 mL) was added and was washed with a saturated NaCl solution (10 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated. The crude product was purified by flash chromatography, affording the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.83 (s, 2H), 6.90 (s, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.74 (dd, J=8.0, 1.2 Hz, 1H), 5.99-5.98 (m, 2H), 3.84 (t, J=4.8 Hz, 4H), 3.40-3.36 (m, 1H), 2.49-2.47 (m, 5H), 2.38-2.35 (m, 2H), 1.27 (d, J=6.8 Hz, 3H). LCMS: (Method A) 355.0 (M+H), Rt. 2.61 min, 99.78% (Max). HPLC: (Method A) Rt. 2.55 min. 99.51% (Max).

Example 168: 1-(2-(4-((S)-1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)ethan-1-ol

(395) ##STR00124##

(396) To a stirred solution of Example 167 (0.2 g, 0.56 mmol) in dry MeOH (5 mL), sodium borohydride (0.48 g, 0.84 mmol, spectrochem) was added portion wise at 0° C. The resulting mixture was stirred at rt for 1 h. It was concentrated, diluted with DCM (20 mL) and washed with brine solution (5 mL) and dried over Na.sub.2SO.sub.4. After evaporation of the solvent, the crude product was purified by flash column chromatography to afford the titled compound. Yield: 77% (0.154 g, brown oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.29 (s, 2H), 6.89 (s, 1H), 6.84 (d, J=8.0 Hz. 1H), 6.76 (dd. J=8.0, 1.6 Hz, 1H), 5.99-5.98 (m, 2H), 5.12 (d, J=4.4 Hz, 1H), 4.62-4.59 (m, 1H), 3.67 (t, J=5.2 Hz, 4H), 3.39-3.37 (m, 1H), 2.42-2.40 (m, 2H), 2.35-2.32 (m, 2H), 1.32-1.27 (m, 6H). LCMS: (Method A) 357.2 (M+H), Rt. 238 min, 99.04% (Max). HPLC: (Method A) Rt. 2.31 min, 98.15% (Max).

Example 171: 2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-6,7-dihydrothiazolo[5,4-c]pyridin-4(5H)-one

(397) ##STR00125##

(398) To a stirred solution of 3-hydroxypropionaic acid (97 mg, 1.0 mmol) in dry NMP (5 mL). Example 132 (300 mg, 0.9 mmol), triethylamine (0.18 mg. 1.8 mmol) and HATU (513 mg, 1.3 mmol) were added at 0° C. The resulting mixture was stirred at rt for 1 h. It was was diluted with water (15 mL) and extracted with EtOAc (2×15 mL). Combined organic layers was dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was further purified by MO Autoprep HPLC (Method B), affording the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ11.98 (s, 1H), 6.88 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.75 (d, J=8.0 Hz, 1H), 5.98-5.97 (m, 2H), 4.71 (t, J=5.2 Hz, 1H), 3.69-3.64 (m, 2H), 3.40-3.32 (m, 5H), 2.54-2.32 (m, 6H), 1.25 (d, J=6.4 Hz, 3H). LCMS: (Method A) 406.0 (M+H), Rt. 2.15 min, 99.05% (Max). HPLC: (Method A) Rt. 2.11 min, 98.88% (Max).

Example 173: (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-5-fluoropyrimidine

(399) ##STR00126##

(400) To a stirred solution of Intermediate 16 (0.4 g, 1.50 mmol) in dry DMF (10 mL), TEA (0.6 mL, 4.5 mmol) and 2-chloro-5-fluoro pyrimidine (0.2 g, 1.5 mmol) were added at rt and the reaction mixture was stirred at 90° C. for 12 h. It was cooled to rt and concentrated. Dichloromeihane (50 mL) was added and the mixture was washed with sat NaCl solution (10 mL) dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by flash chromatography to give the title compound (colourless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.42 (s, 2H), 7.43 (d, J=7.6 Hz, 1H), 6.89-6.85 (m, 1H), 6.75 (dd, J=7.6, 1.2 Hz, 1H), 5.99-5.98 (m, 2H), 3.65 (t, J=5.2 Hz, 4H), 3.37-3.35 (m, 1H), 2.43-2.41 (m, 2H), 2.37-2.35 (m, 2H), 1.28 (d, J=6.4 Hz. 3H). LCMS: (Method A) 331.0 (M+H), Rt. 2.88 min. 99.79% (Max). HPLC: (Method A) Rt. 2.82 min, 99.93% (Max).

Example 175: (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl-5-bromopyrimidine

(401) ##STR00127##

(402) To a stirred solution of Intermediate 16 (4.1 g, 15.5 mmol) in dry DMF (30 mL), TEA (6.4 mL, 46.5 mmol) and 5-bromo-2-chloro pyrimidine (3 g, 15.5 mmol) were added at rt and the reaction mixture was stirred at 90° C. for 12 h. It was cooled to rt and concentrated under reduced pressure. Dichloromethane (150 mL) was added. The solution was washed with brine (50 mL) and dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by flash chromatography affording the title compound. Yield: 57% (3.5 g, white solid). .sup.1H NMR (400 MHz. DMSO-d.sub.6): δ 8.43 (s, 2H), 6.83-6.89 (m, 2H), 6.76 (d, J=7.8 Hz, 1H), 5.99-5.98 (m, 2H), 3.67 (t, J=4.8 Hz, 4H), 3.37-3.33 (m, 1H), 2.41-2.33 (m, 4H), 1.28 (d, J=6.6 Hz, 3H). LCMS: (Method A) 391.0 (M+H), Rt. 3.25 min, 99.9% (Max).

Example 176: (S)-2-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)Propan-2-ol

(403) ##STR00128##

(404) To a stirred solution of Example 175 (0.5 g, 1.28 mmol) in dry THF (10 mL) cooled at −78° C., n-BuLi (1.6 M, 1.2 mL, 19.2 mmol, Aldrich) was added. The mixture was stirred at −78° C. for 1 h. Dry acetone in THF (0.89 g, 1.53 mmol, Aldrich) was then added at the same temperature and the mixture was stirred for 10 minutes. The temperature was increased to rt over 1 h. The reaction mixture was quenched with saturated ammonium chloride solution (10 mL). The desired product was extracted with EtOAc (50 mL), washed with sat NaCl solution (20 mL) and dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by MD Autoprep HPLC (Method D), affording the title product (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): 8.33 (s, 2H), 6.89-6.83 (m, 2H), 6.77-6.74 (m, 1H), 5.99-5.98 (m, 2H), 5.05 (s, 1H), 3.66 (d, J=4.8 Hz, 4H), 3.38-3.35 (m, 1H), 2.45-2.43 (m, 2H), 2.35-2.32 (m, 2H), 1.59 (s, 6H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 371.2 (M+H), Rt. 2.5 min, 99.51% (Max). HPLC: (Method A) Rt. 2.46 min, 98.9% (Max).

Example 177: (S)—N-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)-3-hydroxypropanamide

(405) ##STR00129##

Step 1: (S)-2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-nitropyrimidine

(406) To a stirred solution of Intermediate 16 (4.8 g, 18.7 mmol) in dry ACN (15 mL), Et.sub.3N (10.5 mL, 75.0 mmol) and 2-chloro-5-nitropyrimidine (3.0 g, 18.7 mmol) were added at rt. The mixture was heated at 80° C. overnight. It was cooled to rt, diluted with DCM (20 mL), washed with water (15 mL) and brine (15 mL), and dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was triturated with MeOH, filtered and dried under vacuum, affording the title compound. Yield: 75% (3.8 g, pale yellow solid). LCMS: (Method A) 358.3 (M+H), Rt. 2.94 min, 98.07% (Max).

Step 2: (S)-2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-amine

(407) To a stirred solution of (S)-2-(4-(1-(Benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-4-nitropyrimidine obtained in the previous step (1.0 g, 62.9 mmol) in a mixture of methanol (100 mL) and THE (100 mL), 10% Pd/C (200 mg, 20% w/w) was added at rt. The reaction mixture was stirred under hydrogen atmosphere (1 kg/cm.sup.2) at rt overnight. Completion of the reaction was confirmed by TLC. The reaction mixture was filtered through celite and washed with methanol. After evaporation of the solvents, the title compound was obtained and used in the next step without further purification. Yield: 96% (1.0 g, pale brown solid). LCMS: (Method A) 328.2 (M+H), Rt. 1.52 min, 90.58% (Max).

Step 3: (S)—N-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)-3-hydroxypropanamide

(408) To a stirred solution of 3-hydroxypropionic acid (132 mg, 1.0 mmol) in dry DMF (2 mL), (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-amine obtained in the previous step (400 mg, 1.2 mmol), DIPA (236 mg, 1.83 mmol) and HATU (557 mg, 1.83 mmol) were added at 0° C. The reaction mixture was stirred at rt overnight. The completion of the reaction was monitored by TLC. The reaction mixture was diluted water (10 mL) and extracted with DCM (15 mL). The organic layer was dried over anhydrous Na.sub.2SO.sub.4 and evaporated. The crude product was purified by preparative HPLC (Method B), affording the title product (off white solid). .sup.1H NMR (400 MHz, CDCl.sub.3): δ 8.40 (s, 2H), 7.79 (br s, 1H), 6.88 (s, 1H), 6.75 (s, 2H), 5.96-5.95 (m, 2H), 3.97 (t, J=6.8 Hz, 2H), 3.77 (t, J=4.8 Hz, 4H), 3.35 (q, J=6.8 Hz, 1H), 2.56-2.62 (m, 2H), 2.48-2.55 (m, 2H), 2.42-2.51 (m, 2H), 1.37 (d, J=6.8 Hz, 3H). LCMS: (Method A) 400.2 (M+H), Rt. 2.11 min, 99.42% (Max). HPLC: (Method A) Rt. 2.06 min, 98.9% (Max).

Example 180: (S)-1-(2-(4(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)cyclohexan-1-ol

(409) ##STR00130##

(410) To a stirred solution of Example 175 (0.5 g, 1.28 mmol) in dry THF (10 mL) at −78° C., n-BuLi (1.6M, 0.9 mL, 15.3 mmol, Aldrich) was added and the reaction mixture was stirred at −78° C. for 1 h. Cyclohexanone (0.15 g, 1.53 mmol, Aldrich) in dry THF (1 mL) was added at −78° C. and the mixture was stirred for 10 minutes. The temperature was increased to rt over 1 h. The reaction completion was monitored by TLC. The reaction was quenched with saturated ammonium chloride solution (10 mL) and was extracted with EtOAc (50 mL). The organic layer was washed with sat NaCl solution (20 mL) dried over anhydrous Na.sub.2SO.sub.4 and the solvents were evaporated under reduced pressure. The crude product was purified by flash column chromatography to afford the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.38 (s, 2H), 6.88 (s, 1H), 6.83 (d, J=7.6 Hz, 1H), 6.74 (d, J=7.6 Hz, 1H), 5.98-5.97 (m, 2H), 4.73 (s, 1H), 3.65-3.63 (m, 4H), 3.33-3.31 (m, 1H), 2.40-2.38 (m, 2H), 2.34-2.32 (m, 2H), 1.65-1.60 (m, 6H), 1.45-1.42 (m, 2H), 1.28-1.22 (m, 5H). LCMS: (Method A) 411.2 (M+H), Rt. 3.25 min, 96.51% (Max). HPLC: (Method A) Rt. 3.14 min, 97.88% (Max).

Example 181: (S)-1-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)cyclopentan-1-ol

(411) ##STR00131##

(412) The title compound was prepared according to the protocol described for the preparation of Example 180, replacing cyclohexanone with cyclopentanone (0.12 g, 1.53 mmol, Aldrich). The crude product was purified by flash column chromatography to afford the title compound (brown oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.38 (s, 2H), 6.88 (s, 1H), 6.83 (d, J=7.6 Hz, 1H), 6.74 (d, J=7.6 Hz, 1H), 5.98-5.97 (m, 2H), 4.80 (s, 1H), 3.65-3.63 (m, 4H), 3.32-3.30 (m, 1H), 2.49-2.45 (m, 2H), 2.34-2.32 (m, 2H), 1.82-1.7 (m, 8H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 397.2 (M+H), Rt. 2.90 min, 98.83% (Max). HPLC: (Method A) Rt. 2.87 min, 99.10% (Max).

Example 183: Ethyl (S)-6-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)nicotinate

(413) ##STR00132##

(414) To a stirred solution of Intermediate 16 (1.0 g, 3.71 mmol) in dry DMF (10 mL), TEA (1.54 mL, 11.1 mmol) and ethyl-6-chloro nicotinate (0.69 g, 3.71 mmol) were added at rt and the reaction mixture was heated at 90° C. for 12 h. It was cooled to rt and concentrated. DCM (50 mL) was added and the resulting solution was washed with brine (30 mL) and dried over anhydrous Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by flash chromatography to give the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.61 (d, J=2.4 Hz, 1H), 7.92-7.90 (m, 1H), 6.89 (d, J=1.6 Hz, 1H), 6.85-6.81 (m, 2H), 6.77-6.75 (m, 1H), 5.99-5.98 (m, 2H), 4.27 (q, J=7.2 Hz, 2H) 3.61 (t, J=4.8 Hz, 4H), 3.39-3.37 (m, 1H), 2.45-2.33 (m, 51-1), 129-1.26 (m, 3H). LCMS: (Method A) 384.2 (M+H), Rt. 3.14 min, 98.30% (Max) HPLC: (Method A) Rt. 3.11 min, 98,88% (Max).

Example 185: (S)-(6-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyridin-3-yl)methanol

(415) ##STR00133##

(416) To a stirred solution of Example 183 (0.2 g, 0.56 mmol) in dry MeOH (5 mL) cooled at 0° C., was added lithium aluminium hydride (2.4 M, 0.24 mL, 1.17 mmol, spectrochem) dropwise and the mixture was stirred for 1 h at the same temperature. The reaction mixture was quenched with saturated ammonium chloride (5 mL) and extracted with ethyl acetate (20 mL). The organic phase was washed with brine solution (5 mL), dried over Na.sub.2SO.sub.4 and concentrated. The crude product was purified by flash column chromatography to afford the titled compound. Yield: 66% (88 mg, colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.04 (d, J=2.0 Hz, 1H), 7.46 (dd, J=8.8, 2.4 Hz, 1H), 6.88-6.86 (m, 1H), 6.84-6.82 (m, 1H), 6.76-6.73 (m, 2H), 5.98-5.97 (m, 2H), 4.96 (t, J=5.6 Hz, 1H) 4.32 (d, J=5.6 Hz, 2H), 3.41 (t, J=9.6 Hz, 41-t), 3.34-3.32 (m, 1H), 2.49-2.45 (m, 2H), 2.39-2.37 (m, 2H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 342.3 (M+H), Rt. 1.74 min, 99.28% (Max). HPLC: (Method A) Rt. 1.71 min, 98.49% (Max).

Example 186: (S)-6-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-methylnicotinamide

(417) ##STR00134##

Step 1: Lithium (S)-6-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)nicotinate

(418) Example 183 (1 g, 2.62 mmol) was dissolved in a mixture of MeOH (2 mL), THE (7 mL) and water (1 mL). The resulting mixture was cooled to 0° C. and lithium hydroxide (0.32 g, 7.86 mmol, spectrochem) was added. The resulting mixture was heated at 90° C. for 2 h. It was then concentrated and used as such in next step. Yield: 85% (0.8 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.52 (d, J=2.3 Hz, 1H), 7.89-7.86 (m, 1H), 6.88-6.59 (m, 4H), 5.97-5.96 (m, 2H), 3.43-3.33 (m, 5H), 2.36-2.28 (m, 4H), 1.26 (d, J=8.7 Hz, 3H). LCMS: (Method A) 354.0 (M+H), Rt. 3.639 min, 93.32% (Max).

Step 2: (S)-6-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N-methylnicotinamide

(419) To a stirred solution of lithium (S)-6-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)nicotinate (0.3 g, 8.32 mmol) in dry DCM (10 mL) cooled to 0° C., were added triethylamine (0.5 mL, 3.72 mmol), methylamine in THE (2 M, 2 mL, 2.24 mmol) followed by T.sub.3P (0.6 mL, 3.72 mmol), The resulting mixture was stirred at rt for 1 h, Reaction completion was monitored by TLC. The reaction mixture was washed with 10% sodium bicarbonate solution (10 mL). The organic layer was dried over Na.sub.2SO.sub.4, and evaporated to dryness. The crude product was purified by flash column chromatography (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.54 (d, J=2.0 Hz, 1H), 8.18 (d, J=4.4 Hz, 1H), 7.89 (dd, J=2.4, 9.2 Hz, 1H), 6.89 (d, J=1.2 Hz, 1H), 6.85-6.77 (m, 1H), 6.77-6.74 (m, 2H), 5.99-5.98 (m, 2H), 3.54 (t, J=4.8 Hz, 4H), 3.37-3.35 (m, 1H), 2.73 (d, J=4.4 Hz, 3H), 2.45-2.43 (m, 2H), 2.39-2.32 (m, 2H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 369.2 (M+H), Rt. 2.05 min, 98.6% (Max). HPLC: (Method A) Rt. 2.00 min, 98.3% (Max).

Example 187: (S)-6-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-N,N-dimethylnicotinamide

(420) ##STR00135##

(421) To a stirred solution of lithium (S)-6-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)nicotinate (Example 186, Step 1, 0.5 g, 1.38 mmol) in dry DCM (10 mL) at 0° C., were added triethylamine (2.6 mL, 4.14 mmol), dimethylamine in THE (2 M, 2 mL, 2.24 mmol) followed by T.sub.3P (2.6 mL, 4.14 mmol). The resulting mixture was stirred at rt for 1 h. Reaction completion was monitored by TLC. The reaction mixture was washed with 10% sodium bicarbonate solution (10 mL). The organic layer was dried over Na.sub.2SO.sub.4, and evaporated to dryness. The crude product was purified by flash column chromatography. Yield: 52% (279 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.19 (d, J=2.4 Hz, 1H), 7.59 (dd, J=2.4, 8.8 Hz, 1H), 6.90 (s, 1H), 6.85 (d, J=8.0 Hz, 1H), 6.78 (t, J=7.2 Hz, 2H), 5.99-5.98 (m, 2H), 3.54-3.51 (m, 4H), 3.38-3.33 (m, 1H), 2.96 (s, 6H), 2.47-2.46 (m, 2H), 2.41-2.34 (m, 2H), 1.29 (d, J=6.8 Hz, 3H). LCMS: (Method A) 383.3 (M+H). Rt. 2.19 min, 99.8% (Max). HPLC: (Method A) Rt. 2.14 min. 99.6% (Max).

Example 188: (S)-4-(2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)tetrahydro-2H-pyran-4-ol

(422) ##STR00136##

(423) To a stirred solution of Example 175 (0.5 g, 1.28 mmol) in dry THF (10 mL) at −78° C. was added n-BuLi (1.6 M, 1.2 mL, 1.92 mmol, Aldrich) and the resulting mixture was stirred to −78° C. for 1 h. Tetrahydrofuran-4H-pyran-4-one (0.15 g, 1.53 mmol, Aldrich) in THF (5 mL) was added at −78° C. for 10 minutes. The temperature was increased to rt over 1 h. The reaction completion was monitored by TLC. The reaction mixture was quenched with saturated ammonium chloride solution (10 mL). It was extracted with EtOAC (50 mL). The organic phase was washed with saturated NaCl solution (20 mL) and dried over anhydrous Na.sub.2SO.sub.4. The crude product was purified by flash column chromatography to afford the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.42 (s, 2H), 6.90 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.76 (d, J=8.0 Hz, 1H), 5.99-5.98 (m, 2H), 5.07 (s, 1H), 3.77-3.66 (m, 8H), 3.39-3.37 (m, 1H), 2.44-2.40 (m, 2H), 2.37-2.33 (m, 2H), 1.95-1.87 (m, 2H), 1.57-1.54 (m, 2H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 413.3 (M+H), Rt. 2.32 min, 99.65% (Max). HPLC: (Method A) Rt. 2.27 min, 99.23% (Max).

Example 189: 3-(2-(4-((S)-1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)tetrahydrofuran-3-ol

(424) ##STR00137##

(425) Example 189 was prepared according the same procedure as Example 188, replacing tetrahydrofuran-4H-pyran-4-one with dihydrofuran (2H)-one (0.13 g, 1.53 mmol, Aldrich). The crude product was purified by flash column chromatography to afford the title compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.41 (s, 2H), 6.90 (d, J=12 Hz, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.76 (d, J=7.6 Hz, 1H), 5.99-5.98 (m, 2H), 3.97-3.93 (m, 2H), 3.78-3.76 (m, 1H), 3.68-3.65 (m, 6H), 2.50-2.42 (m, 1H), 2.35-2.32 (m, 4H), 2.33-2.32 (m, 1H), 2.11-2.06 (m, 1H), 1.28 (d, J=6.4 Hz, 3H). LCMS: (Method A) 399.0 (M+H), Rt. 2.32 min, 97.39% (Max). HPLC: (Method A) Rt. 2.22 min, 97.15% (Max).

Example 190: (S) 2-(6-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyridin-3-yl)propan-2-ol

(426) ##STR00138##

(427) To a stirred solution of Example 183 (0.3 g, 0.78 mmol) in dry THE (10 mL) at 0° C. was added methyl magnesium bromide solution in THE (1.4 M, 0.8 mL, 1.17 mmol, Aldrich). The resulting mixture was stirred at 0° C. for 1 h. The temperature was increased to rt and the mixture was stirred 12 h at that temperature. The reaction completion was monitored by TLC. The reaction mixture was quenched with saturated ammonium chloride solution (10 mL) and extracted with EtOAc (50 mL), The organic layer was washed with sat NaCl solution (20 mL) and dried over anhydrous Na.sub.2SO.sub.4. The crude product was purified by flash column chromatography, yielding the title compound. Yield: 61% (0.178 g, colorless oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.17 (d, J=2.0 Hz, 1H), 7.59-7.57 (m, 1H), 6.89-6.83 (m, 2H), 6.78-6.70 (m, 2H), 5.99-5.98 (m, 2H), 4.92 (s, 1H), 3.39 (t, J=4.8 Hz, 5H), 2.40-2.36 (m, 4H), 1.39 (s, 6H), 1.29 (d, J=6.8 Hz, 3H). LCMS: (Method A) 370.2 (M+H), Rt. 1.94 min, 99.3% (Max). HPLC: (Method A) Rt. 1.92 min, 99.60% (Max).

Example 191: (S)-1-(1-(benzo[d][1,3]dioxol-6-yl)ethyl)-4-(5-bromopyridin-2-yl)piperazine

(428) ##STR00139##

(429) To a stirred solution of Intermediate 16 (5.5 g, 20.68 mmol) in dry DMF (50 mL), TEA (7.1 mL, 51.45 mmol) and 5-bromo-2-fluoropyridine (3 g, 17.24 mmol) were added at rt and the reaction mixture was stirred at 90° C. overnight. The reaction mixture was cooled to rt and concentrated under reduced pressure. Water (30 mL) was added and the compound was extracted with EtOAc (100 mL). The organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated. The resulting crude product was purified by flash chromatography to afford the title compound (white solid), .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.14 (d, J=2.4 Hz, 1H), 7.66-7.65 (m, 1H), 6.87 (d, J=1.2 Hz, 1H), 6.84 (d, J=7.6 Hz, 1H), 6.77-6.55 (m, 2H), 5.99-5.98 (m, 2H), 3.43 (t, J=4.8 Hz, 4H), 3.36-3.34 (m, 1H), 2.47-2.45 (m, 2H), 2.38-2.35 (m, 2H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 392.0 (M+H), Rt. 3.32 min, 99.88% (Max). HPLC: (Method A) Rt. 3.26 min, 99.96% (Max).

Example 192: (S)-1-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)-4-(5-(methylthio)pyridin-2-yl)piperazine

(430) ##STR00140##

(431) To a stirred solution of Example 191 (3.0 g, 7.71 mmol) in dry THE (30 mL), n-BuLi (6.0 mL, 9.2 mmol) was added at −78° C. and and stirred for 1 h. Dimethyl disulphide (45 mL) was added at same temperature and stirred for 1 h at rt. The reaction mixture was quenched with saturated NH.sub.4Cl and extracted with EtOAc. The organic layer was washed with water and dried over anhydrous Na.sub.2SO.sub.4 and concentrated. The resulting crude was purified by flash column chromatography to afford the title compound. Yield: 90% (2.58 g, yellow solid). .sup.1H NMR (400 MHz, CDCl.sub.3): δ 8.21 (d, J=2.4 Hz, 1H), 7.52-7.51 (m, 1H), 6.89 (s, 1H), 6.76 (s, 2H), 6.56 (d, J=8.8 Hz, 1H), 5.96-5.94 (m, 2H), 3.52 (m, 4H), 3.34 (d, J=6.0 Hz, 1H), 2.57-2.50 (m, 4H), 2.38 (s, 3H), 1.36 (d, J=6.4 Hz, 3H). LCMS: (Method A) 358.3.0 (M+H), Rt. 2.61 min, 97.99% (Max). HPLC: (Method A) Rt. 2.56 min, 97.57% (Max).

Example 195: (S)-2-(4-(1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)-5-methoxypyrimidine

(432) ##STR00141##

(433) To a stirred solution of Intermediate 16 (0.55 g, 2.07 mmol) in dry DMF (5 mL), triethylamine (0.9 mL, 6.21 mmol, spectrochem) and 2-chloro-5-methoxy pyrimidine (0.3 g, 2.07 mmol, Combi-Blocks) were added and the resulting mixture was heated to 90° C. for 12 h. The reaction mixture was cooled down to rt and concentrated. Dichloromethane (25 mL) was added and the resulting solution was washed with water (20 mL), brined (20 mL) and dried over Na.sub.2SO.sub.4. After evaporation of the solvents, the crude product was purified by flash column chromatography to afford the title compound (brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.18 (s, 2H), 6.87 (m, 2H), 6.76 (d, J=8.0 Hz, 1H), 5.99-5.98 (m, 2H), 3.76 (s, 3H), 3.58 (t, J=4.8 Hz, 4H), 3.38-3.36 (m, 1H), 2.45-2.42 (m, 2H), 2.36-2.33 (m, 2H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 343.2 (M+H), Rt. 2.73 min, 99.83% (Max). HPLC: (Method A) Rt. 2.71 min, 99.41% (Max).

Example 197 and 198: (S)-1-(2-(4-((S)-1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)ethan-1-ol and (S)-1-(2-(4-((R)-1-(benzo[d][1,3]dioxol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)ethan-1-ol

(434) ##STR00142##

(435) Example 168 was submitted to chiral preparative HPLC Method PK to separate both enantiomers. The first eluting compound was concentrated to give Example 198 (brown oil). .sup.1H NMR (400 MHz, DMSO d.sub.6): δ 8.29 (s, 2H), 6.89 (s, 1H), 6.84 (d, J=7.9 Hz, 1H), 6.75 (d, J=7.9 Hz, 1H), 5.99-5.98 (m, 2H), 5.12 (d, J=4.4 Hz, 1H), 4.62-4.61 (m, 1H), 3.67-3.65 (m, 4H), 3.38-3.36 (m, 1H), 2.51-2.33 (m, 4H), 1.31 (d, J=6.4 Hz, 3H), 1.28 (d, J=6.4 Hz, 3H). LCMS: (Method A) 357.2 (M+H), Rt. 2.30 min, 99.37% (Max). HPLC: (Method A) Rt. 2.30 min, 98.05% (Max). Chiral HPLC: (Method H) Rt. 7.06 min, 100%. The second eluting compound was concentrated to give Example 197 (brown oil). .sup.1H NMR (400 MHz, DMSO d.sub.6): δ 8.29 (s. 2H), 6.89 (s, 1H), 6.84 (d, J=8.0 Hz, 1H), 6.75 (d, J=8.0 Hz, 1H), 5.99-5.98 (m, 2H), 5.11 (d, J=4.4 Hz, 1H), 4.62-4.59 (m, 1H), 3.68-3.65 (m, 4H), 3.38-3.36 (m, 1H), 2.35-2.32 (m, 4H), 1.31 (d, J=6.4 Hz, 3H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 357.2 (M+H), Rt. 2.29 min, 99.93% (Max). HPLC: (Method N) Rt. 2.26 min, 99.62% (Max). Chiral HPLC: (Method H) Rt 7.60 min, 100%.

Example 199: 2-(4-(1-(2,3-dihydrobenzofuran-6-yl)ethyl)piperazin-1-yl)-6,7-dihydrothiazolo[5,4-c]pyrimidin-4(5H)-one

(436) ##STR00143##

(437) To a stirred solution of Intermediates 25 (0.5 g, 1.61 mmol) in DMF (5 mL, 10V), TEA (0.89 mL, 6.4 mmol) and Intermediate 21 (0.44 g, 2.41 mmol) were added at rt and the mixture was stirred at 80° C. for 12 h. It was concentrated under vacuum and resulting crude mixture was purified by MD Autoprep HPLC (Method C) to afford titled compound (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.29 (s, 1H), 7.16 (d, J=7.2 Hz, 1H), 6.76 (d, J=7.6 Hz, 1H), 6.72 (s, 1H), 4.51 (t, J=8.8 Hz, 2H), 3.46-3.42 (m, 4H), 3.38-3.36 (m, 4H), 3.14 (t, J=8.8 Hz, 2H), 2.69 (t, J=7.2 Hz, 2H), 2.44-2.43 (m, 2H), 1.28 (d, J=6.80 Hz, 3H). LCMS: (Method A) 358.0 (M+H), Rt. 2.324 min, 97.963% (Max). HPLC: (Method A) Rt. 2.279 min, 99.224% (Max).

Example 200: Ethyl 5-(4-(1-(2,3-dihydrobenzofuran-6-yl)ethyl)piperazin-1-1,3,4-thiadiazole-2-carboxylate

(438) ##STR00144##

(439) To a stirred solution of ethyl 5-chloro-1,3,4-thiadiazole-2-carboxylate (0.25 g, 1.29 mmol) in dry DMF (2.5 mL), K.sub.2CO.sub.3 (0.54 g, 3.89 mmol) and Intermediate 30 (0.59 g, 1.93 mmol) were added at rt. The reaction mixture was stirred overnight at 80° C. It was then concentrated under vacuum. EtOAc (10 mL) was added and the resulting solution was washed with water (10 mL), brine (10 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated. The crude product was purified by flash chromatography to afford the title compound. Yield: 51% (0.26 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.15 (d, J=7.60 Hz, 1H), 6.75 (d, J=7.60 Hz, 1H), 6.71 (s, 1H), 4.50 (t, J=8.80 Hz. 2H), 4.33 (q, J=6.80 Hz, 2H), 3.54 (t, J=5.20 Hz, 4H), 3.43-3.41 (m, 1H), 3.13 (t, J=8.40 Hz, 2H), 2.45-2.32 (m, 4H), 1.31-1.27 (m, 6H). LCMS: (Method A) 389.2 (M+H), Rt. 2.88 min, 95.7% (Max). HPLC: (Method A) Rt 2.81 min, 96.5% (Max).

Example 201: 5-(4-(1-(2,3-dihydrobenzofuran-6-yl)ethyl)piperazin-1-yl)-N-methyl-1,3,4-thiadiazole-2-carboxamide

(440) ##STR00145##

(441) The title compound was synthesized according to the procedure described for Example 59 and 60, starting from Example 200 (brown thick oil). .sup.1H NMR (400 MHz, DMSO-d.sub.6): 8.74 (q, J=4.8 Hz, 1H), 7.16 (d, J=7.2 Hz, 1H), 6.76 (d, J=1.2 Hz, 1H), 6.72 (s, 1H), 4.51 (t, J=8.40 Hz, 2H), 3.49 (t, J=4.80 Hz, 4H), 3.43-3.41 (m, 1H), 3.14 (t, J=8.80 Hz, 2H), 2.75 (d, J=4.8 Hz, 3H), 2.53-2.51 (m, 2H), 2.46-2.42 (m, 2H), 1.28 (d, J=6.8 Hz, 3H). LCMS: (Method A) 374.0 (M+H), Rt. 2.35 min 96.4% (Max). HPLC: (Method A) Rt 2.30 min, 98.2% (Max).

Examples 202 and 203: (R)—N-(5-(4-(1-(2,3-dihydrobenzofuran-6-yl)ethyl)piperazin-1-yl)-1,3,4-thiadiazol-2-yl)acetamide and (S)—N-(5-(4-(1-(2,3-dihydrobenzofuran-6-yl)ethyl]piperazin-1-yl)-1,3,4-thiadiazol-2-yl)acetamide

(442) ##STR00146##

(443) The racemic mixture of Example 128 was separated by SFC using the preparative chiral method PA.

(444) The first eluting compound correspond to Example 202 (off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 11.99 (s, 1H), 7.14 (d, J=7.6 Hz, 1H), 6.75 (d, J=7.2 Hz, 1H), 6.71 (s, 1H), 4.50 (t, J=8.8 Hz, 2H), 3.38-3.36 (m, 1H), 3.35-3.33 (m, 4H), 3.13 (t, J=8.4 Hz, 2H), 2.42-2.38 (m, 4H), 2.07 (s, 3H), 1.27 (d, J=6.80 Hz, 3H). LCMS: (Method A) 374.2 (M+H), Rt. 2.31 min, 99.4% (Max). HPLC: (Method A) Rt 2.34 min, 99.7% (Max). CHIRAL HPLC: (SFC Method AA) Rt. 2.81 min, 100% (Max).

(445) The second eluting compound corresponds to Example 203 (white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 12.05 (s, 1H), 7.14 (d, J=7.6 Hz, 1H), 6.75 (d, J=7.6 Hz, 1H), 6.70 (s, 1H), 4.49 (t. J=8.8 Hz, 2H), 3.37-3.36 (m, 1H), 3.32-3.31 (m, 4H), 3.13 (t, J=8.8 Hz, 2H), 2.41-2.38 (m, 4H), 2.08 (s, 3H), 1.27 (d, J=6.40 Hz, 3H). LCMS: (Method A) 374.2 (M+H), Rt. 2.31 min, 99.37% (Max). HPLC: (Method A) Rt 2.35 min, 99.59% (Max), CHIRAL HPLC: (SFC Method AA) Rt. 3 45 min, 99.42% (Max).

Example B01: Human O-GlcNAcase Enzyme Inhibition Assay

(446) 5 μl of the appropriate concentration of a solution of inhibitor in McIlvaine's Buffer (pH 6.5) in 2% DMSO (for a dose response curve calculation) is added into each well of a 384-well plate (Greiner, 781900). Then, 20 nM of His-Tagged hOGA and 10 μM of FL-GlcNAc (Fluorescein mono-beta-D-(2-deoxy-2-N-acetyl) glucopyranoside; Marker Gene Technologies Inc, M1485) were added to the 384-well plate for a final volume of 20 μl. After incubation for 60 min at room temperature, the reaction was terminated by the addition of 10 μL of stop buffer (200 mM glycine, pH 10.75). The level of fluorescence (λ.sub.exc485 nm; (λ.sub.emm 520 nm) was read on a PHERAstar machine. The amount of fluorescence measured was plotted against the concentration of inhibitor to produce a sigmoidal dose response curve to calculate an IC.sub.50. All individual data was corrected by subtraction of the background (Thiamet 3 uM=100% inhibition) whilst 0.5% DMSO was considered as the control value (no inhibition).

Example B02: Pharmacodynamic Model: Total Protein O-GlcNAcylation Immunoassay (RL2 mAb, Meso Scale Electrochemilumiinescence (ECL) Assay)

(447) The test compound was administered orally to C57BL/6J mice. At defined time intervals after compound administration, typically a time ranging between 2 and 48 hours, preferably between 4 and 24 hours, mice were sacrificed by decapitation for blood collection and forebrain dissection. Right brain hemispheres were placed in 2 ml Precellys tubes, snap frozen in dry ice and stored at −80° C. Left hemispheres were placed in 2 ml Eppendorf tubes, snap frozen in dry ice and stored at −80° C. until further processing. Blood samples were collected in Sarstedt tubes containing 35 IU of Heparin and kept at 4° C. After centrifugation for 10 min at 3800×g, 4° C., 50 μL of plasma from each sample was transferred to a 1.5 ml Eppendorf tube and stored at −80° C.

(448) For the preparation of soluble brain protein for the immunoassay the hemispheres were homogenized in ice-cold Cytobuster reagent (71009—Merck Millipore) buffer with protease inhibitor cocktail. After centrifugation for 15 min at 17000×g at 4° C. the supernatants were transferred into polycarbonate tubes (1 ml). The supernatants were cleared by centrifugation for 1 h. at 100000×g, 4° C., and the protein concentrations were determined by using the BCA kit (23227—Pierce, Rockford, Ill.) according to the manufacturer's instructions.

(449) Total Protein O-GlcNAcylation Immunoassay:

(450) Samples were randomised and 120 μg/ml (25 μl/well) of soluble brain protein was directly coated on a Multi-array 96-well high bind plate (L15XB-3 High bind—Meso Scale Discovery) overnight at 4° C. After washing (3× with PBS-T buffer), the plate was blocked with MSD blocker A solution for 1 h. at room temperature (RT) under agitation. After washing (3× with PBS-T buffer), the plate was incubated with 0.1 μg/ml of a mouse monoclonal antibody directed against O-GlcNAc moieties (RL2; MA1-072-Thermo Scientific) for 1 h. at RT under agitation. For the ECL assay, after washing (3× with PBS-T buffer), 1 μg/ml of a SULFO-TAG™ labeled anti-mouse secondary antibody (Meso Scale Discovery) was added and the plate was incubated for 1 h. at RT under agitation and protected from light. After washing (3× with PBS-T buffer). 150 μl/well of 1× Read Buffer T was added to the plates before reading on a Sector Imager 6000 (Meso Scale Discovery).

Example B03: Pharmaceutical Preparations

(451) (A) Injection vials: A solution of 100 g of an active ingredient according to the invention and 5 g of disodium hydrogen phosphate in 3 l of bi-distilled water was adjusted to pH 6.5 using 2 N hydrochloric acid, sterile filtered, transferred into injection vials, lyophilized under sterile conditions and sealed under sterile conditions. Each injection vial contained 5 mg of active ingredient.

(452) (B) Suppositories: A mixture of 20 g of an active ingredient according to the invention was melted with 100 g of soy lecithin and 1400 g of cocoa butter, poured into moulds and allowed to cool. Each suppository contained 20 mg of active ingredient.

(453) (C) Solution: A solution was prepared from 1 g of an active ingredient according to the invention, 9.38 g of NaH.sub.2PO.sub.4.Math.2 H.sub.2O, 28.48 g of Na.sub.2HPO.sub.4. 12 H.sub.2O and 0.1 g of benzalkonium chloride in 940 ml of bi-distilled water. The pH was adjusted to 6.8, and the solution was made up to 1 l and sterilized by irradiation. This solution could be used in the form of eye drops.

(454) (D) Ointment: 500 mg of an active ingredient according to the invention were mixed with 99.5 g of Vaseline under aseptic conditions.

(455) (E) Tablets: A mixture of 1 kg of an active ingredient according to the invention, 4 kg of lactose, 1.2 kg of potato starch, 0.2 kg of talc and 0.1 kg of magnesium stearate was pressed to give tablets in a conventional manner in such a way that each tablet contained 10 mg of active ingredient.

(456) (F) Coated tablets: Tablets were pressed analogously to EXAMPLE E and subsequently coated in a conventional manner with a coating of sucrose, potato starch, talc, tragacanth and dye.

(457) (G) Capsules: 2 kg of an active ingredient according to the invention were introduced into hard gelatin capsules in a conventional manner in such a way that each capsule contained 20 mg of the active ingredient.

(458) (H) Ampoules: A solution of 1 kg of an active ingredient according to the invention in 60 I of bi-distilled water was sterile filtered, transferred into ampoules, lyophilized under sterile conditions and sealed under sterile conditions. Each ampoule contained 10 mg of active ingredient.

(459) (I) Inhalation spray: 14 g of an active ingredient according to the invention were dissolved in 10 l of isotonic NaCl solution, and the solution was transferred into commercially available spray containers with a pump mechanism. The solution could be sprayed into the mouth or nose. One spray shot (about 0.1 ml) corresponded to a dose of about 0.14 mg.

Example C01: Physical Properties Characterization Methods

(460) X-ray Powder Diffraction (XRPD)

(461) Approximately 5-10 mg of sample was gently compressed on the XRPD zero back ground single obliquely cut silica sample holder. The sample was then loaded into a Philips X-Pert PRO diffractometer and analysed using the following experimental conditions. Tube anode: Cu Generator tension: 40 kV Tube current: 40 mA Wavelength alpha1: 1.5406 Å Wavelength alpha2: 1.5444 Å Start angle [2 theta]: 5 End angle [2 theta]: 50 Continuous scan

(462) For suspected novel salts a slower scan speed was also used over a range of 4-40′2q

(463) Raman Spectroscopy

(464) Samples were analysed by a Nicolet Almega XR Dispersive Raman Microscope for its Raman spectrum using the following conditions: Exposure Time: 1.0 s Acquisition No: 50 Slit Size: 100 μm Wavelength range: 2000-400 cm.sup.−1 (single grating) Laser: He—Ne 780 nm 100% power Objective: 20×/0.40 (magnifier/numerical aperture number)

(465) Baseline subtraction was performed on the Raman spectra. Nuclear Magnetic

(466) Resonance (NMR)

(467) The .sup.1H NMR was run in DMSO-d.sub.6 using a Bruker Avance III 400 instrument.

(468) Simultaneous Thermal analysis (STA)

(469) Approximately 5 mg of sample was accurately weighed into a ceramic crucible and it was placed into the chamber of Perkin-Elmer STA 6000 TGA/DTA analyzer at ambient temperature. The sample was then heated at a rate of 10° C./min, typically from 30° C. to 300° C., during which time the change in weight was monitored as well as DTA signal. The purge gas used was nitrogen at a flow rate of 20 cm.sup.3/min.

(470) Differential Scanning Calorimetry (DSC)

(471) Approximately, 5 mg of each sample was weighed into an aluminium DSC pan and sealed non-hermetically with an aluminium lid. The sample was then loaded into a Perkin-Elmer Jade DSC and held at 30° C. Once a stable heat-flow response was obtained, the sample was then heated to a 250 or 300° C. at a scan rate of 10° C./min and the resulting heat flow response was monitored. A 20 cm.sup.3/min helium purge was used. Prior to analysis, the instrument was temperature and heat flow verified using an indium standard.

Example C02: Primary Salt Screen Procedure

(472) Preferred compound of Structure I were selected for primary salt screen procedure.

(473) If the respective acid was a solid (such as but not limited to malefic acid, fumaric acid, succinic acid, L-tartaric acid, citric acid, adipic acid, benzoic acid p-toluene sulphonic acid), the Compound of formula (I) (˜30 mg) was weighed into twelve separate vials with ˜1.1 equivalents of the counter-ion as a physical solid mixture. 300 μL of the appropriate solvent was added.

(474) If the respective acid, was in aqueous solution or a liquid (such as but not limited to 5M hydrochloric acid, 6M sulphuric acid, 85% orthophosphoric acid, methane sulphonic acid) the appropriate volume corresponding to ˜1.1 equivalents was added to ˜30 mg of the API in the appropriate solvent (300 μL) (mostly suspension).

(475) The mixture was shaken well by hand. All slurries or solutions were temperature-cycled between ambient and 40° C. for ˜18-24 hours. If enough solid was present the supernatent was decanted off, if possible, and the solid dried by evaporation. If a solution was observed, the solvent was allowed to evaporate under nitrogen then dried.

(476) Diverse solvents or solvents mixture were selected for the primary salt screen, such as but not limited to methanol, acetone, ethyl acetate, acetonitrile, tetrahydrofuran, toluene, 50/50 methanol/water and 90/10 propan-2-ol/water. They were selected on the basis of structural diversity and acceptability. They were all commonly used in final step processes.

(477) Any solids were examined by XRPD and are reported in FIGS. 1 to 6.

Example C03: Methods of Preparation

Example C03-1: Hydrochloride Salt Preparation

(478) A preferred method of preparation of this salt was as follows:

(479) Compound of Formula I (1.33 mmol) was suspended in ethanol (5 mL). 5M Hydrochloric acid (300 μL, 1.5 mmol, 1.25 equiv) was added and mixed well. The resulting suspension was temperature-cycled between 40° C. and ambient temperature overnight (18-24 hours). The product amassed and ethanol (2 mL) was added to mobilise before the product was filtered, washed with ethanol (2×2 mL) and dried in a vacuum oven at 50° C. for ˜24 hours to constant weight. (Yield 88%).

(480) Starting from 500 mg of Example 69, 480 mg of hydrochloride salt was obtained.

(481) Example 69 hydrochloride salt was characterized by XRPD (FIG. 11), Raman (FIG. 12), .sup.1H NMR (FIG. 13), STA (FIG. 14) and DSC (FIG. 15).

Example C03-2: Maleate Salt Preparation

(482) A preferred method of preparation of this salt was as follows,

(483) Compound of Formula I (1.33 mmol) was suspended in ethanol (5 mL). Maleic acid (170 mg, 1.46 mmol, 1.1 equiv) was added and mixed well. The resulting suspension was temperature-cycled between 40° C. and ambient temperature overnight (18-24 hours). The product was filtered, washed with ethanol (2×2 mL) and dried in a vacuum oven at 50° C. for ˜24 hours to constant weight.

(484) Starting from 500 mg of Example 69, 518 mg of maleate salt was obtained.

(485) Example 69 maleate salt was characterized by XRPD (FIG. 16), .sup.1H NMR (FIG. 17), STA (FIG. 18) and DSC (FIG. 19).

Example C03-3: L-Tartrate Salt Preparation

(486) A preferred method of preparation of this salt was as follows.

(487) Compound of Formula I (1.33 mmol) was suspended in ethanol (5 mL). L-tartaric acid (200 mg, 1.33 mmol, 1 equiv) was added and mixed well. The resulting suspension was temperature-cycled between 40° C. and ambient temperature overnight (18-24 hours). The product was filtered, washed with ethanol (2×2 mL) and dried in a vacuum oven at 50° C. for ˜24 hours to constant weight.

(488) Starting from 500 mg of Example 69, 599 mg of L-tartrate salt was obtained.

(489) Example 69 L-tartrate salt was characterized by XRPD (FIG. 20), .sup.1H NMR (FIG. 21).

Example C04: Visual Aqueous Solubility

(490) The salts and free base (˜10 mg) were weighed into glass vials and water was added in 0.1 mL portions up to 3 mL and 1 mL portions thereafter, Solubility was assessed visually following a brief period of equilibration.

(491) The aqueous solubility of different salt of Example 69 was assessed, as reported in Table 1.

(492) TABLE-US-00001 Example 69 Salts Visual aqueous solubility L-Tartrate salt  ~20 mg/mL Maleate salt ~4.5 mg/mL Hydrochloride salt ~4.5 mg/mL Free base <0.5 mg/mL

(493) Salts of compounds of formula I with various other acids did not yield a useful improvement of aqueous solubility over the free base and/or have not been stable or solid or have other properties not suitable for pharmaceutical development, especially for solid oral dosage forms, such as tablets, e.g compressed tablets.