SUCCINATE AND FUMARATE ACID ADDITION SALTS OF PIPERAZINE DERIVATIVES

Abstract

The invention relates to succinic acid addition salts or fumaric acid addition salts of piperazine derivatives of formula (I), as well as solid forms, such as polymorphic forms, thereof, which are useful as pharmaceutical ingredients and, in particular, as glucosidase inhibitors.

##STR00001##

Claims

1. An acid addition salt of succinic acid or fumaric acid with a compound of formula I ##STR00090## wherein Y denotes H or CH.sub.3, T denotes N or CH, X denotes one of the following sulfoximine groups: S(O)(NR.sup.3′)CH.sub.3, S(O)(NR.sup.3′)CH.sub.2CH.sub.3, S(O)(NR.sup.3′)CH.sub.2CH.sub.2OH or S(O)(NR.sup.3′)CH.sub.2CH.sub.2OCH.sub.3, NS(O)(R.sup.3′)CH.sub.3, NS(O)(R.sup.3′)CH.sub.2CH.sub.3, NS(O)(R.sup.3′)CH.sub.2CH.sub.2OH or NS(O)(R.sup.3′)CH.sub.2CH.sub.2OCH.sub.3 and R.sup.3′ denotes H or a straight chain or branched alkyl group having 1 to 12 carbon atoms, wherein 1 to 3 CH.sub.2-groups may be replaced by a group selected from SO.sub.2, CO, and O, and wherein 1 to 5 hydrogen atoms may be replaced by F, C, Br or I, as well as stereoisomers and solid forms thereof.

2. An acid addition salt of succinic acid or fumaric acid with compounds of formula I1, I2 or I3: ##STR00091## wherein X, Y and T have the meaning given in claim 1, and solid forms thereof.

3. An acid addition salt of succinic acid or fumaric acid with compounds of formula I1a, I1b, I2a, I2b, I3a or I3b: ##STR00092## wherein X and Y have the meaning given in claim 1, and solid forms thereof.

4. The acid addition salt according to claim 1 to 3, wherein X is selected from the group ##STR00093## and wherein R.sup.3′ has the meaning given in claim 1.

5. An acid addition salt of succinic acid or fumaric acid with a compound of formula Ia, Ib, Ic, Id, Ie, If, Ig, Ih, Ii, Ij, Ik or IL: ##STR00094## ##STR00095## and solid forms thereof.

6. The succinic acid or fumaric acid addition salt according to any one of claims 1 to 5 in a molar ratio of a compound of formula I, Ia, Ib, Ic, Id, Ie, If, Ig, Ih, Ii, Ij, Ik, IL, I1a, I1b, I2a, I2b, I3a, I3b, I1, I2 or I3 to acid of 1 to 1.

7. The mono-succinic acid salt of one of the compounds Ia, Ib, Ic, Id according to claim 5 in a solid form having the characteristic X-ray powder diffraction pattern as shown on FIG. 1.

8. The mono-fumaric acid salt of one of the compounds Ia, Ib, Ic, Id according to claim 5 in a solid form having the characteristic X-ray powder diffraction pattern as shown on FIG. 4.

9. A method for the preparation of an acid addition salt of succinic acid or fumaric acid with compounds of formula I and their stereoisomers comprising the following steps: a) suspending or dissolving the selected compound of formula I and the respective acid in a suitable solvent or solvent mixture; b) heating the mixture obtained in step a) to a temperature of between about 30° C. to about the boiling point of the selected solvent or solvent mixture, and allowing the mixture to cool to room temperature; c) optionally repeating step b) several times; d) separating and drying the solid thus obtained.

10. A solid oral dosage form comprising a succinic acid addition salt or fumaric acid addition salt according to any one of claims 1 to 8.

11. A succinic acid addition salt or fumaric acid addition salt according to any one of claims 1 to 8 for use as a medicament.

12. A succinic acid addition salt or fumaric acid addition salt according to any one of claims 1 to 8 for use in a method of treating a condition selected from the group consisting of neurodegenerative diseases, diabetes, cancer, cardiovascular diseases and stroke.

13. A succcinic acid addition salt or fumaric acid addition salt according to any one of claims 1 to 8 for use in a treatment of a condition according to claim 12, wherein the condition is selected from the group of one or more tauopathies and Alzheimer's disease, Dementia, Amyotrophic lateral sclerosis (ALS), Amyotrophic lateral sclerosis with cognitive impairment (ALSci), Argyrophilic grain disease, Behavioural variant frontotemporal dementia (BvFTD), Bluit disease, Chronic traumatic encephalopathy, Corticobasal degeneration (CBP), Dementia pugilistica, Diffuse neurofibrillary tangles with calcification, Down's syndrome, Familial British dementia, Familial Danish dementia, Frontotemporal dementia with parkinsonism linked to chromosome 17 (FTDP-17), Frontotemporal lobar degeneration (FTLD), Ganglioglioma, Gangliocytoma, Gerstmann-Straussler-Scheinker disease, Globular glia tauopathy, Guadeloupean parkinsonism, Hallevorden-Spatz disease (neurodegeneration with brain iron accumulation type 1), Lead encephalopathy, Lipofuscinosis, Meningioangiomatosis, Multiple system atrophy, Myotonic dystrophy, Niemann-Pick disease (type C), Pallido-ponto-nigral degeneration, Parkinsonism-dementia complex of Guam, Pick's disease (PiD), Parkinson's disease dementia, Postencephalitic parkinsonism (PEP), Primary progressive aphasia, Prion diseases (including Creutzfeldt-Jakob Disease (CJD), Progressive nonfluent aphasia, Variant Creutzfeldt-Jakob Disease (vCJD)), Fatal Familial Insomnia, Kuru, Progressive supercortical gliosis, Progressive supranuclear palsy (PSP), Semantic dementia, Steele-Richardson-Olszewski syndrome, Subacute sclerosing panencephalitis, Tangle-only dementia, Tuberous sclerosis, Huntington's disease and Parkinson's disease, preferably one or more tauopathies and Alzheimer's disease.

14. A method for treating a tauopathy, wherein an acid addition salt according to any one of claims 1 to 8 is administered to a mammal in need of such treatment.

15. A method for inhibiting a glycosidase, wherein a system expressing the glycosidase is contacted with an acid addition salt according to any one of claims 1 to 8 under in vitro conditions such that the glycosidase is inhibited.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0084] The present invention is further illustrated by reference to the accompanying figures:

[0085] FIG. 1: Characteristic X-ray powder diffraction pattern of crystalline Example 35 succinate salt, Form 1

[0086] FIG. 2: Characteristic 1H NMR spectrum of crystalline Example 35 succinate salt, Form 1

[0087] FIG. 3: Characteristic STA thermogram of crystalline Example 35 succinate salt, Form 1

[0088] FIG. 4: Characteristic X-ray powder diffraction pattern of crystalline Example 35 fumarate salt

[0089] FIG. 5: Characteristic 1H NMR spectrum of crystalline Example 35 fumarate salt

[0090] FIG. 6: Characteristic STA thermogram of crystalline Example 35 fumarate salt

[0091] FIG. 7: Characteristic X-ray powder diffraction pattern of crystalline Example 35 succinate salt, Form 2

[0092] FIG. 8: Characteristic 1H NMR spectrum of crystalline Example 35 succinate salt, Form 2

[0093] FIG. 9: Characteristic X-ray powder diffraction pattern of crystalline Example 35 hydrochloride salt

[0094] FIG. 10: Characteristic STA thermogram of crystalline Example 35 hydrochloride salt

[0095] FIG. 11: Characteristic X-ray powder diffraction pattern of crystalline Example 35 benzoate salt

[0096] FIG. 12: Characteristic 1H NMR spectrum of crystalline Example 35 benzoate salt

EXPERIMENTAL PART

[0097] Preparation of Compounds

[0098] 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.

[0099] 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.

[0100] The HPLC, MS and NMR data provided in the examples described below are obtained as followed:

[0101] .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 (6) 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).

[0102] LCMS Analysis Condition:

[0103] Instrument name: Agilent Technologies 1290 infinity 11.

[0104] Method A: Method: A-0.1% TFA in H.sub.2O, B-0.1% TFA in ACN; flow rate: 2.0 mL/min; column: XBridge C8 (50×4.6 mm, 3.5 μm), +ve mode

[0105] Method B: Method: A-10 mM NH.sub.4HCO.sub.3 in H.sub.2O, B-ACN; flow rate: 1.0 mL/min; column: XBridge C8 (50×4.6 mm, 3.5 μm), +ve mode

[0106] Method C: Method: A-0.1% HCOOH in H.sub.2O, B-ACN; flow rate: 1.5 ml/min; column: ZORBAX Eclipse XDB-C18 (50×4.6 mm, 3.5 μm), +ve mode

[0107] HPLC Analysis Condition:

[0108] Instrument name: Agilent 1200 Series instruments as followed using % with UV detection (maxplot).

[0109] Method A: Method: A-0.1% TFA in H.sub.2O, B-0.1% TFA in ACN; flow rate: 2.0 mL/min; column: XBridge C8 (50×4.6 mm, 3.5 μm).

[0110] Method B: Method: A-10 mM NH.sub.4HCO.sub.3 in H.sub.2O, B-ACN; flow rate: 1.0 mL/min; column: XBridge C8 (50×4.6 mm, 3.5 μm).

[0111] Chiral HPLC Analysis Condition:

[0112] Instrument name: Agilent 1260 infiinity II

[0113] Method A: Mobile Phase: 0.1% DEA in n-Hexane: EtOH: 60:40; flow rate: 1.0 mL/min; column: Chiralcell OD-H (250×4.6 mm, 5 μm).

[0114] Chiral SFC Analysis Condition:

[0115] Instrument name: THAR-SFC 80 and THAR-SFC 200 (analytical)

[0116] Ratio between CO.sub.2 and co-solvent is ranging between 60:40 and 80:20

[0117] Method A: Mobile Phase: 20 mM ammonia in IPA, flow rate: 4 mL/min; column: Chiralpak ADH (250×4.6 mm, 5 μm).

[0118] Method B: Mobile Phase: 20 mM ammonia in methanol, flow rate: 10 mL/min; column: YMC Cellulose C (250×4.6 mm, 5 μm).

[0119] Method C: Mobile Phase: 20 mM ammonia in IPA, flow rate: 4 mL/min; column: Lux A1 (250×4.6 mm, 5 μm).

[0120] Method D: Mobile Phase: 20 mM ammonia in MeOH, flow rate: 4 mL/min; column: Chiralpak ADH (250×4.6 mm, 5 μm).

[0121] Method E: Mobile Phase: IPA, flow rate: 3 mL/min; column: Lux A1 (250×4.6 mm, 5 μm).

[0122] Prep-HPLC Analysis Condition:

[0123] Method A: A-0.1% TFA in H.sub.2O, B-MeOH or CAN; column: Sunfire C8 (19×250 mm, 5 μm) or Sunfire C18 (30×250 mm, 10 μm).

[0124] Method B: A-10 mM NH.sub.4HCO.sub.3 in H.sub.2O, B-MeOH or ACN, Column: Sunfire C8 (19×250 mm, 5 μm) or Sunfire C18 (30×250 mm, 10 μm).

[0125] Chiral Preparative SFC Analysis Condition:

[0126] Instrument name: THAR-SFC 80, THAR-SFC 200 and PIC SFC 10-150

[0127] Ratio between CO.sub.2 and co-solvent is ranging between 60:40 and 80:20

[0128] Method A: Mobile Phase: 20 mM ammonia in IPA; flow rate: 3 mL/min; column: Chiralpak ADH (250×30 mm, 5 μm).

[0129] Method B: Mobile Phase: 20 mM ammonia in methanol; flow rate: 5 mL/min; column: YMC Cellulose C (250×30 mm, 5 μm).

[0130] Method C: Mobile Phase: 20 mM ammonia in IPA; flow rate: 5 mL/min; column: Lux A1 (250×30 mm, 5 μm).

[0131] Method D: Mobile Phase: 20 mM ammonia in MeOH; flow rate: 4 mL/min; column: Chiralpak ADH (250×30 mm, 5 μm).

[0132] Method E: Mobile Phase: IPA, flow rate: 100 mL/min; column: Phenomenex Lux Amylose-1 (250×30 mm, 5 μm).

[0133] 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.

[0134] The microwave chemistry was performed on a single mode microwave reactor Initiator™ Sixty from Biotage.

[0135] Specific Optical Rotation

[0136] Instrument name: Autopol VI, by Rudolph Research Analytical, Hackettstown, N.J., USA.

Synthesis

Intermediate 1: 5-(1-chloroethyl)benzo[d]thiazole

[0137] ##STR00019##

Step 1: 1-(benzo[d]thiazol-5-yl)ethan-1-one

[0138] ##STR00020##

[0139] To a degased solution of 5-bromo benzothiazole (Combi-Blocks, 750 g, 3.51 mol) in dry toluene (6 L), 1-ethoxyvinyl tributyltin (1.42 L, 4.21 mol) followed by Pd(PPh.sub.3).sub.2Cl.sub.2 (105.6 g, 150.7 mmol) were added at RT and the resulting mixture was heated at 90° C. for 16 h. After completion of the reaction (monitored by TLC), the reaction mixture was cooled to RT, filtered through celite and washed with EtOAc (1 L). The filtrate was evaporated under vacuum and 5N HCl solution (2.5 L) was added to the crude mixture. The resulting light brown coloured solution was stirred at RT for 1.5 h, neutralized with the slow addition of a saturated NaHCO.sub.3 (12 L) solution over 1 h at 0° C. and was extracted with EtOAc (2×5 L). The combined organic layer was washed with brine solution (2.5 L), dried over anhydrous Na.sub.2SO.sub.4 and evaporated under vacuum. The resulting crude material was dissolved in DCM (750 mL), hexane (3 L) was added to it and the resulting solid was filtered and the solids were washed with MTBE (4 L). The combined filtrate was concentrated under vacuum and the residue was dissolved in EtOAc (2.5 L). Charcoal (35 g) was added to the resulting solution. The organic layer was stirred for 6 h at RT and filtered and solids were washed with EtOAc (1 L). The organinc layer was concentrated to afford the title compound. Yield: 79% (475 g, light brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.53 (s, 1H), 8.69 (s, 1H), 8.32 (d, J=8.4 Hz, 1H), 8.04 (dd, J=8.4, 1.3 Hz, 1H), 2.71 (s, 3H). LCMS: (Method C) 178.0 (M+H), Rt. 1.4 min, 98.5% (Max). HPLC: (Method A) Rt 2.6 min, 97.2% (Max).

Step 2: 1-(benzo[d]thiazol-5-yl)ethan-1-ol

[0140] ##STR00021##

[0141] To a stirred solution of 1-(benzo[d]thiazol-5-yl)ethan-1-one (475 g, 2.68 mol)) in MeOH (4.75 L), NaBH.sub.4 (152.28 g, 4.03 mol) was added portion wise at 0° C. and the reaction mixture was stirred at RT for 1 h. Completion of the reaction was monitored by TLC. The reaction mixture was then quenched with ice water (400 mL) at 0° C. and concentrated under vacuum. To the resulting crude mixture, water (2.5 L) was added and the aqueous layer was extracted with EtOAc (2×2.5 L). The combined organic layer was washed with brine (2 L), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude solid was triturated with hexane: diethyl ether (8:2) and decanted to afford the title compound. Yield: 93% crude (440 g, pale brown gummy solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.37 (s, 1H), 8.09 (d, J=8.4 Hz, 1H), 8.04 (s, 1H), 7.50 (d, J=1.2 Hz, 1H), 5.32 (d, J=4.0 Hz, 1H), 4.93-4.89 (m, 1H), 1.40 (d, J=6.4 Hz, 3H). LCMS: (Method C) 180.1 (M+H), Rt. 1.2 min, 98.7% (Max). HPLC: (Method A) Rt. 2.2 min, 99.5% (Max).

Step 3: 5-(1-chloroethyl)benzo[d]thiazole

[0142] ##STR00022##

[0143] To a stirred solution of 1-(benzo[d]thiazol-5-yl)ethan-1-ol (440 g, 2.46 mol)) in DCM (4.4 L), thionyl chloride (534 mL, 7.37 mol) was added drop wise over 30 min at 0° C. and the reaction mixture was stirred for 1 h at 0-10° C. Completion of the reaction was monitored by TLC. The reaction mixture was then evaporated under vacuum. The resulting crude material was co-distilled with dry DCM (3×400 mL), dried under vacuum to afford title compound which was used in the next step without further purification. Yield: 100% crude (488 g, yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): b 10.79 (s, 1H), 8.52 (s, 1H), 8.16 (d, J=8.4 Hz, 1H), 7.86 (d, J=8.4 Hz, 1H), 5.30-5.24 (m, 1H), 1.91 (d, J=6.8 Hz, 3H). LCMS: (Method C) 198.1 (M+H), Rt. 2.0 min, 50.1% (Max). HPLC: (Method A) Rt. 3.9 min, 66.8% (Max).

Intermediate 2: 5-(1-chloroethyl)-2-methylbenzo[d]thiazole

[0144] ##STR00023##

Step 1: 1-(2-methylbenzo[d]thiazol-5-yl)ethan-1-one

[0145] ##STR00024##

[0146] To a degased solution of 5-bromo-2-methylbenzo[d]thiazole (10 g, 43.85 mmol, Combi block) in dry toluene (40 mL), Pd(PPh.sub.3).sub.2Cl.sub.2 (3.07 g, 4.3 mmol) followed by 1-ethoxyvinyl tributyltin (16.2 mL, 48.2 mmol) were added and the reaction mixture was heated at 90° C. for 16 h. Completion of the reaction was monitored by TLC, the reaction mixture was then cooled to 0° C. and filtered through celite. The resulting filtrate was evaporated under vacuum, and then 6N HCl solution (80 mL) was added to the crude material. The reaction mixture was stirred at RT for 1 h, then neutralized by using NaHCO.sub.3 and the aqueous layer was extracted with EtOAc (2×80 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and evaporated under vacuum. The resulting crude material was purified by flash column chromatography (Biotage Isolera, eluent: 60-80% EtOAc in hexane). Yield: 72% (6 g, yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.48 (s, 1H), 8.18 (d, J=11.2 Hz, 1H), 7.95 (d, J=11.2 Hz, 1H), 2.85 (s, 3H), 2.67 (s, 3H). LCMS: (Method A) 192.3 (M+H), Rt. 2.9 min, 96.8% (Max).

Step 2: 1-(2-methylbenzo[d]thiazol-5-yl)ethan-1-ol

[0147] ##STR00025##

[0148] To a stirred solution of 1-(2-methylbenzo[d]thiazol-5-yl)ethan-1-one (6 g, 31.31 mmol) in MeOH (30 mL), NaBH.sub.4 (2.37 g, 62.74 mmol) was added portion wise at 0° C. and the reaction mixture was stirred at RT for 1 h. Completion of the reaction was monitored by TLC, the reaction mixture was then quenched with ice and evaporated under vacuum. To the resulting reaction mixture, water (10 mL) was added and extracted with EtOAc (2×60 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and evaporated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 70-90% EtOAc in hexane). Yield: 87% (5.3 g, brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.94 (d, J=8.4 Hz, 1H), 7.86 (s, 1H), 7.38 (dd, J=8.2, 1.2 Hz, 1H), 5.28 (d, J=4.4 Hz, 1H), 4.90-4.80 (m, 1H), 2.79 (s, 3H), 1.38 (d, J=6.4 Hz, 3H). LCMS: (Method A) 194.2 (M+H), Rt. 2.5 min, 98.9% (Max).

Step 3: 5-(1-chloroethyl)-2-methylbenzo[d]thiazole

[0149] ##STR00026##

[0150] To a stirred solution of 1-(2-methylbenzo[d]thiazol-5-yl)ethan-1-ol (5.3 g, 27.4 mmol) in dry DCM (50 mL), thionyl chloride (4 mL, 54.8 mmol) was added drop wise at 0° C. and stirred at 25° C. for 1 h. Completion of the reaction was monitored by TLC, the reaction mixture was then concentrated under vacuum and co-distilled with toluene (10 mL). The resulting crude material was dried under high vacuum to afford the title compound which was used in the next step without further purification. Yield: 5.5 g (crude), brown oil. .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.05-8.01 (m, 2H), 7.53 (dd, J=8.4, 2.0 Hz, 1H), 5.51 (q, J=6.8 Hz, 1H), 2.81 (s, 3H), 1.86 (d, J=6.8 Hz, 3H). LCMS: (Method A) 212.2 (M+H), Rt. 4.26 min, 36.1% (Max).

Intermediate 6: 5-(1-(piperazin-1-yl)ethyl)benzo[d]thiazole

[0151] ##STR00027##

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

[0152] ##STR00028##

[0153] To a stirred solution of tert-butyl piperazine-1-carboxylate (522 g, 2.97 mol) and TEA (2.5 L, 17.34 mol) in DMF (2 L), Intermediate 1 (488 g, 2.48 mol) in DMF (3 L) was added dropwise at RT under N.sub.2 atm and the reaction mixture was heated to 60° C. for 24 h. Completion of the reaction was monitored by TLC. The reaction mixture was then cooled to RT. To the resulting mixture, water (10 L) was added and the aqueous layer was extracted with EtOAc (6×2 L). The combined organic layer was washed with brine (2.5 L), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (silica gel: 60-120 mesh, eluent: 40% EtOAc in pet-ether) to afford the title compound. Yield: 81% (700 g, pale brown gummy solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (s, 1H), 8.11 (d, J=8.4 Hz, 1H), 7.99 (s, 1H), 7.47 (d, J=8.4 Hz, 1H), 3.45 (q, J=6.8 Hz, 1H), 3.34-3.29 (m, 4H), 2.37-2.27 (m, 4H), 1.41-1.18 (m, 12H). LCMS: (Method A) 348.1 (M+H), Rt. 1.6 min, 85.6% (Max). HPLC: (Method A) Rt. 2.89 min, 81.5% (Max).

Step 5: 5-(1-(piperazin-1-yl)ethyl)benzo[d]thiazole

[0154] ##STR00029##

[0155] To a stirred solution of tert-butyl 4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazine-1-carboxylate (700 g, 2.02 mol) in 1, 4-dioxane (3 L), HCl solution in dioxane (3.50 L, 4M) was added dropwise at 0° C. and the resulting solution was stirred at RT for 6 h. After completion of the reaction (monitored by TLC), the reaction mixture was concentrated under vacuum and the resulting crude material was triturated with EtOAc (2×1 L). The hydrochloride salt was dissolved in water (2.5 L) and aqueous layer was washed with EtOAc (3×2 L) and DCM (3×2 L). The resulting aqueous layer was basified with 6N NaOH (pH˜12) and extracted with EtOAc (3×2 L). The combined organic layer was washed with brine (500 mL), water (500 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum to afford the title compound. Yield: 70% (350 g, pale brown gummy solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.38 (s, 1H), 8.10 (d, J=8.4 Hz, 1H), 7.98 (s, 1H), 7.46 (dd, J=8.4, 1.2 Hz, 1H), 3.33 (m, 1H), 3.58 (q, J=6.8 Hz, 1H), 2.71-2.68 (m, 4H), 2.37-2.27 (m, 4H), 1.19 (d, J=6.8 Hz, 3H). LCMS: (Method A) 248.1 (M+H), Rt. 0.88 min, 97.3% (Max). HPLC: (Method A) Rt. 1.6 min, 99.1% (Max).

Intermediate 7: (S)-5-(1-(piperazin-1-yl)ethyl)benzo[d]thiazole or (R)-5-(1-(piperazin-1-v)ethyl)benzo[d]thiazole

[0156] ##STR00030##

[0157] To a stirred mixture of intermediate 6 (100 g, 405.0 mmol) in EtOH (2 L, 20V), D-di-p-anisoyltartaric acid (42.31 g, 101.2 mmol) was added at RT and heated at 90° C. for 20 min. (Note: Salt formation was observed slowly after 3 to 5 min after addition of D-di-p-anisoyltartaric acid). Then the reaction mixture was stirred at RT overnight. The resulting mixture was filtered and the filtration cake was washed with EtOH (2×250 mL, 5V), diethyl ether (250 mL) and dried under high vacuum. To increase the ee, the salt (66 g, 79% ee) was further refluxed in EtOH (1 L, 10V) for 24 h and stirred at RT overnight. The obtained salt was filtered, washed with EtOH (200 mL, 2V), diethyl ether (200 mL) and dried under high vacuum. The same procedure was repeated to achieve the ee of 96.1% (21.2 g). This step was repeated on 300 g scale to obtain the salt (113.2 g).

[0158] The above obtained salts (134.4 g) were dissolved in water (300 mL), basified to pH˜14 with 6N NaOH solution (350 mL) and the aqueous layer was extracted with EtOAc (2×1 L). The combined EtOAc layer was washed with brine solution (2×1 L), water (300 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum to obatin the title compound (enantiomer ratio 97.41:2.58%). Yield: 85% (63.0 g, pale brown gummy solid). .sup.1H NMR (400 MHz, DMSO-d6): δ 9.38 (s, 1H), 8.09 (d, J=8.4 Hz, 1H), 7.97 (s, 1H), 7.45 (d, J=8.0 Hz, 1H), 3.55 (q, J=6.8 Hz, 1H), 2.67-2.66 (m, 4H), 2.34-2.25 (m, 4H), 1.34 (d, J=6.8 Hz, 3H). LCMS: (Method A) 248.2 (M+H), Rt. 1.5 min, 98.5% (Max). HPLC: (Method A) Rt. 1.6 min, 98.7% (Max). Chiral HPLC: (Method A) Rt. 11.1 min, 97.4% (Max).

[0159] Chiral resolution agent D-di-p-anisoyltartaric acid can be exchanged for D-di-p-toluyltartaric acid or (R)-(+)-chlocyphos to obtain the identical products.

[0160] Intermediate 6, dihydrochloride salt (15.57 g, 48.60 mmol) was mixed with sodium acetate trihydrate (26.45 g, 194.4 mmol, 400 mol %), R-(+)-chlocyphos (8.11 g, 29.32 mmol, 99% ee, 60.3 mol %), water (120 mL) and ethanol (16 mL). The mixture, becoming a thick suspension on stirring, was warmed up, resulting in a clear solution when it reached reflux temperature. The solution was allowed to cool with stirring and some seed crystals (small spatula, ca. 10-20 mg) were added about every 5-10 minutes, until crystallization started (between 5 and 10 times). Crystallization of the salt started at ca. 45° C. The suspension was stirred at 20° C. overnight, then filtered, the solid was washed with water/ethanol 10/1 (55 mL) and water (20 mL). It was dried for 2 d at 20° C. (11.12 g, 21.22 mmol, 44%). The ee was 97.5%.

[0161] This salt was heated under gentle reflux with water (90 mL) and ethanol (10 mL). Further ethanol (2 mL) was added, and the solution was allowed to cool to 20° C. and stirred for 6 h. The resulting solid was filtrated and washing with water (50 mL). After driing at 20° C. for 3 d, Chlorcyphos salt was isolated (9.50 g, 18.13 mmol, 37%). The ee was 100%.

[0162] The above obtained chlocyphos-salt with 100% ee (8.50 g, 16.22 mmol) was stirred for 1.5 h in a mixture of toluene (100 mL), water (50 mL), and sodium hydroxide (4.04 g, 101 mmol). Sodium chloride (20 g) was added and the mixture was stirred for 15 min, then filtered. The filtrate layers were separated. The solid isolated on the filter and in the aqueous layer were stirred with toluene (125 mL). It was filtered and the filtrate layers were separated again. The combined toluene layers were dried and evaporated at 60° C. to yield the desired free amine as a solidifying oil (3.60 g, 14.55 mmol, 90%, pure by NMR), and with 99.6% ee.

Intermediate 8: 2-methyl-5-(1-(piperazin-1-yl) ethyl)benzo[d]thiazole

[0163] ##STR00031##

Step 4: 2-methyl-5-(1-(piperazin-1-yl)ethyl)benzo[d]thiazole

[0164] ##STR00032##

[0165] To a stirred solution of piperazine (13.6 g, 15.9 mmol) in dry DCM (80 mL), Intermediate 2 (4.2 g, 19.8 mmol) was added dropwise over a period of 20 min and the reaction mixture was stirred at RT overnight. After completion of the reaction (monitored by TLC), water (50 mL) was added to the resulting mixture and stirred for 10 min. The organic layer was separated, washed with brine (50 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 18-20% methanol in DCM) to afford the title compound. Yield: 16% (870 mg, pale brown gummy solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.32 (s, 1H), 7.95 (d, J=8.6 Hz, 1H), 7.80 (s, 1H), 7.34 (d, J=8.8 Hz, 1H), 3.52-3.48 (m, 1H), 2.78 (s, 3H), 2.70 (t, J=6.0 Hz, 4H), 2.44-2.24 (m, 4H), 1.33 (d, J=8.8 Hz, 3H). LCMS: (Method A) 262.2 (M+H), Rt. 1.8 min, 97.3% (Max).

Intermediate 9: 2-Chloro-5-(methylsulfinyl)pyrimidine

[0166] ##STR00033##

Step 1: 2-chloro-5-(methylthio)pyrimidine

[0167] ##STR00034##

[0168] To a stirred solution of 5-bromo-2-chloropyrimidine (5 g, 25.8 mmol) and 1, 2-dimethyldisulfane (2.92 g, 31.02 mmol) in THF (15 mL), n-BuLi (16.0 mL, 25.8 mmol, 1.6 M in hexane) was added at −78° C. and stirred for 1 h under the same temperature. Afer completion of the reaction (monitored by TLC), the reaction was then quenched with the addition of sat.NH.sub.4Cl (15 mL) and the aqueous layer was extracted with EtOAc (50 mL). The organic layer was washed with water (10 mL), brine (10 mL) and dried over anhydrous Na.sub.2SO.sub.4. The resulting crude material was purified by flash chromatography (silica gel: 60-120 mesh, eluent: 15% EtOAc in pet ether) to afford the title compound. Yield: 13% (0.6 g, white solid). .sup.1H NMR (400 MHz, CDCl.sub.3): δ 8.50 (s, 2H), 2.56 (s, 3H). LCMS: (Method A) 161.1 (M+H), Rt. 2.1 min, 95.2% (Max). HPLC: (Method A) Rt. 2.4 min, 98.5% (Max).

Step 2: 2-chloro-5-(methylsulfinyl)pyrimidine

[0169] ##STR00035##

[0170] To a stirred solution of 2-chloro-5-(methylthio)pyrimidine (0.6 g, 2.49 mmol) in DCM (2 mL, 10 V), m-CPBA (0.644 g, 3.23 mmol) was added portion wise at 0° C. for 30 min. Completion of the reaction was monitored by TLC, the reaction mixture was then quenched with 10% NaHCO.sub.3 solution and extracted with DCM (2×100 mL). The combined organic layer was washed with brine (30 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 10-12% EtOAc in pet ether) to afford the title compound. Yield: 33% (330 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.88 (s, 2H), 2.92 (s, 3H). LCMS: (Method A) 177.1 (M+H), Rt. 0.8 min, 99.1% (Max). HPLC: (Method A) Rt. 1.9 min, 99.6% (Max).

Intermediate 10: N-((2-chloropyrimidin-5-yl)(methyl)(oxo)-λ.SUP.6.-sulfanylidene)-2,2,2-trifluoroacetamide

[0171] ##STR00036##

[0172] To a stirred solution of Intermediate 9 (0.9 g, 5.09 mmol) in DCM (18.0 mL, 20 V), trifluoroacetamide (1.15 g, 10.19 mmol), MgO (0.8 g, 20.38 mmol), Rh.sub.2(OAc).sub.4 (0.12 g, 0.25 mmol) and PhI(OAC).sub.2 (2.46 g, 7.64 mmol) were added and the reaction mixture was stirred at RT overnight. Completion of the reaction was monitored by TLC, the reaction mixture was then filtered through celite and the filtrate was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 16-18% EtOAc in pet ether) to afford the title compound. Yield: 74% (1.1 g, white solid). LCMS: (Method A) 288.0 (M+H), Rt. 3.8 min, 71.1% (Max).

Intermediate 11 and Intermediate 12: N-((2-chloropyrimidin-5-yl)-(R)-(methyl)(oxo)-λ.SUP.6.-sulfanylidene)-2,2,2-trifluoroacetamide and N-((2-chloropyrimidin-5-yl)-(S)-(methyl)(oxo)-λ.SUP.6.-sulfanylidene)-2,2,2-trifluoroacetamide

[0173] ##STR00037##

Step 1: 2-chloro-5-(methylsulfinyl)pyrimidine

[0174] ##STR00038##

[0175] The intermediate 9 (502 g, 2.84 mol) was separated by SFC analysis (Pic SFC 10-150; CO.sub.2: IPA (70:30); column: Lux A1 (250×30); flow rate: 100 mL/min; wave length: 210 nm; cycle time: 5 min; back pressure: 100 bar, Method E). The first eluting peak (250.0 L of IPA) was concentrated at 40° C. Yield: 40% (201.0 g, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.05 (s, 2H), 2.98 (s, 3H). LCMS: (Method A) 177.0 (M+H), Rt. 0.7 min, 99.9% (Max). HPLC: (Method B) Rt. 2.04 min, 99.8% (Max). Chiral SFC: (Method E) Rt 2.1 min, 100% (Max).

[0176] The second eluting peak (250.0 L of IPA) was concentrated at 40° C. Yield: 36% (180.0 g, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.04 (s, 2H), 2.98 (s, 3H). LCMS: (Method A) 177.0 (M+H), Rt. 0.8 min, 99.8% (Max). HPLC: (Method A) Rt. 1.02 min, 98.8% (Max). Chiral SFC: (Method E) Rt 4.6 min, 99.7%.

Step 2: N-((2-chloropyrimidin-5-yl)-(S)-(methyl)(oxo)-λ.SUP.6.-sulfanylidene)-2,2,2-trifluoroacetamide and N-((2-chloropyrimidin-5-yl)-(R)-(methyl)(oxo)-λ.SUP.6.-sulfanylidene)-2,2,2-trifluoroacetamide

[0177] To the stirred solution of the first eluting compound isolated in step 1 (0.5 g, 2.8 mmol) in DCM (5 mL), trifluroacetamide (0.64 g, 5.66 mmol), MgO (0.45 g, 11.3 mmol), Rh.sub.2(OAc).sub.4 (0.062 g, 0.14 mmol) and PhI(OAc).sub.2 (1.36 g, 4.20 mmol) were added and the reaction mixture was stirred at RT overnight. Completion of the reaction was monitored by TLC. The reaction mixture was then filtered through celite, washed with DCM. The organic layer was concentrated under vacuum and the resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 25-28% EtOAc in pet ether) to afford Intermediate 11. Yield: 86% (0.69 g, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (s, 2H), 3.98 (s, 3H). LCMS: (Method A) 191.9 (M-COCF.sub.3+H), Rt. 3.8 min, 73.8%.

[0178] To a stirred solution of the second eluting compound isolated in step 1 (2.0 g, 0.01 mmol) in DCM (20 mL, 10 V), trifluoroacetamide (2.56 g, 0.226 mol), MgO (1.825 g, 0.045 mol), Rh.sub.2(OAC).sub.4 (250 mg, 0.56 mol) and PhI(OAC).sub.2 (5.49 g, 0.016 mol) were added and stirred overnight at RT. Completion of the reaction was monitored by TLC, then the reaction mixture was filtered through celite. The filtrate was concentrated under vacuum, the resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 15-25% EtOAc in pet ether) to afford Intermediate 12. Yield: 62% (2.0 g, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (s, 2H), 4.04 (s, 3H). LCMS: (Method A) 288.0 (M+H), Rt. 1.9 min, 92.8% (Max). HPLC: (Method A) Rt. 3.8 min, 96.1% (Max).

Intermediate 13: N-((2-chloropyrimidin-5-yl)(ethyl)(oxo)-λ.SUP.6.-sulfanylidene)-2,2,2-trifluoroacetamide

[0179] ##STR00039##

Step 1: 2-chloro-5-(ethylthio)pyrimidine

[0180] ##STR00040##

[0181] To a stirred solution of t-butyl nitrite (5.99 g, 58.13 mmol) and 1, 2-diethyldisulfane (9.4 g, 77.51 mmol) in DCM (200 mL), 2-chloropyrimidin-5-amine (5 g, 38.75 mmol) was added portion wise at RT for 30 min and reaction mixture was stirred at RT overnight. After completion of the reaction (monitored by TLC), the reaction mixture was concentrated to obtain the crude material which was purified by flash chromatography (silica gel: 60-120 mesh, eluent: 5% EtOAc in pet ether) to afford the title compound. Yield: 24% (1.6 g, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.74 (s, 2H), 3.12-3.08 (m, 2H), 1.26-1.22 (m, 3H).

Step 2: 2-chloro-5-(ethylsulfinyl)pyrimidine

[0182] ##STR00041##

[0183] To a stirred solution of 2-chloro-5-(ethylthio)pyrimidine (1.6 g, 9.16 mmol) in DCM (32.0 mL, 20 V) cooled to 0° C., m-CPBA (2.05 g, 11.90 mmol) was added portion wise and the resulting mixture was stirred at 0° C. for 30 min. Completion of the reaction was monitored by TLC, the reaction mixture was then quenched with 10% NaHCO.sub.3 solution and extracted with DCM (2×100 mL). The combined organic layer was washed with brine (30 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 10-12% EtOAc in pet ether) to afford the title compound. Yield: 58% (1.0 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.99 (s, 2H), 3.31 (q, J=8.6 Hz, 2H), 1.11 (t, J=8.6 Hz, 3H). LCMS: (Method A) 191.2 (M+H), Rt. 1.3 min, 98.7% (Max).

Step 3: N-((2-chloropyrimidin-5-yl)(ethyl)(oxo)-λ.SUP.6.-sulfanylidene)-2, 2, 2-trifluoroacetamide

[0184] ##STR00042##

[0185] To a stirred solution of 2-chloro-5-(ethylsulfinyl)pyrimidine (0.95 g, 5.00 mmol) in DCM (18.0 mL, 20 V), trifluoroacetamide (1.13 g, 10.0 mmol), MgO (0.8 g, 20.0 mmol), Rh.sub.2(OAc).sub.4 (0.11 g, 0.25 mmol) and PhI(OAc).sub.2 (2.41 g, 7.5 mmol) were added and the reaction mixture was stirred at RT overnight. Completion of the reaction was monitored by TLC, the reaction mixture was then filtered through celite and the filtrate was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 16-18% EtOAc in pet ether) to afford the title compound. Yield: 63% (1.1 g, white solid).

Intermediate 14: N-((2-chloropyrimidin-5-yl)(oxo)(propyl)-M-sulfanylidene)-2,2,2-trifluoroacetamide

[0186] ##STR00043##

Step-1: 2-chloro-5-(propylthio)pyrimidine

[0187] ##STR00044##

[0188] To a stirred solution of t-butyl nitrite (6.9 ml, 57.91 mmol) and 1, 2-dipropyl disulfane (12 mL, 77.2 mmol) in DCE (200 mL), 2-chloropyrimidin-5-amine (5.0 g, 38.61 mmol, Angene) was added portion wise at RT for 30 min and the reaction mixture was stirred at RT overnight. Completion of reaction was monitored by TLC, then the reaction mixture was concentrated under reduced pressure. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 20% EtOAc in Pet-Ether) to afford the title compound. Yield: 25% (2.0 g, pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.72 (s, 2H), 2.68 (t, J=9.2 Hz, 2H), 1.81-1.54 (m, 2H), 1.14-0.90 (m, 3H). LCMS: (Method A) 189 (M+H), Rt. 3.7 min, 94.5 (Max).

Step-2: 2-chloro-5-(propylsulfinyl)pyrimidine

[0189] ##STR00045##

[0190] To a stirred solution of 2-chloro-5-(propylthio)pyrimidine (2.3 g, 12.7 mmol) in DCM (23 mL, 10 V), m-CPBA (Spectrochem, 1.89 g, 10.97 mmol) was added portion wise at 0° C. and stirred for 60 min at 0° C. Completion of the reaction was monitored by TLC, then the reaction mixture was quenched with 10% NaHCO.sub.3 solution and extracted with DCM (2×50 mL). The combined DCM layer was washed with brine (20 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 60-70% EtOAc in pet ether) to afford the title compound. Yield: 43% (0.9 g, pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.01 (s, 2H), 3.19-3.00 (m, 2H), 1.75-1.53 (m, 2H), 0.97 (t, J=6.0 Hz, 3H).

Step-3: N-((2-chloropyrimidin-5-yl)(oxo)(propyl)-λ.SUP.6.-sulfanylidene)-2, 2, 2-trifluoroacetamide

[0191] ##STR00046##

[0192] To a stirred solution of 2-chloro-5-(propylsulfinyl)pyrimidine (0.9 g, 4.07 mmol) in DCM (20 mL, 10 V), trifluoroacetamide (0.92 g, 8.10 mmol), MgO (1.56 g, 16.30 mmol), Rh.sub.2(OAc).sub.4 (90.11 mg, 0.20 mmol) and PhI(OAc).sub.2 (1.97 g, 6.11 mmol) were added at RT and the reaction mixture was stirred at RT overnight. Completion of the reaction was monitored by TLC, then the reaction mixture was filtered through celite and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 16-18% EtOAc in pet ether) to afford the title compound. Yield: 78% (1.0 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.36 (s, 2H), 3.19-3.00 (m, 2H), 1.75-1.53 (m, 2H), 0.97 (t, J=6.0 Hz, 3H).

Intermediate 15: N-((6-chloropyridin-3-yl)(methyl)(oxo)-λ.SUP.6.-sulfanylidene)-2,2,2-trifluoroacetamide

[0193] ##STR00047##

Step 1: 2-choro-5-(methythio)pyridine

[0194] ##STR00048##

[0195] To a stirred solution of t-butyl nitrite (6.01 g, 58.33 mmol) and dimethyl disulfane (7.32 mL, 77.78 mmol) in DCE (50 mL), 6-chloropyridin-3-amine (5.0 g, 38.89 mmol) was added portion wise at RT for 30 min and stirred at RT overnight. Completion of the reaction was monitored by TLC, then the reaction mixture was poured into water and the aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 50% EtOAc in pet-ether) to afford title compound. Yield: 73% (4.5 g, colourless liquid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.30 (d, J=2.8 Hz, 1H), 7.79-7.76 (m, 1H), 7.46-7.44 (m, 1H), 2.54 (s, 3H). LCMS: (Method A) 160.2 (M+H), Rt. 2.3 min, 95.4% (Max).

Step 2: 2-chloro-5-(methylsulfinyl)pyridine

[0196] ##STR00049##

[0197] To a stirred solution of 2-chloro-5-(methylthio)pyridine (4.5 g, 28.19 mmol) in DCM (45 mL, 10 V) cooled to 0° C., m-CPBA (6.32 g, 36.64 mmol) was added portion wise and stirred at 0° C. for 60 min. Completion of the reaction was monitored by TLC, then the reaction mixture was quenched with 10% NaHCO.sub.3 solution and extracted with DCM (2×100 mL). The combined organic layer was washed with brine (30 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 60-70% EtOAc in pet ether) to afford the title compound. Yield: 72% (3.5 g, pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.69 (d, J=3.2 Hz, 1H), 8.20-8.16 (m, 1H), 7.76 (s, 1H), 2.89 (s, 3H). LCMS: (Method A) 176.2 (M+H), Rt. 1.4 min, 96.3% (Max).

Step 3: N-((6-chloropyridin-3-yl)(methyl)(oxo)-λ.SUP.6.-sulfanylidene)-2,2,2-trifluoroacetamide

[0198] ##STR00050##

[0199] To a stirred solution of 2-chloro-5-(methylsulfinyl)pyridine (2.0 g, 11.42 mmol) in DCM (20 mL, 10 V), trifluoroacetamide (2.58 g, 22.85 mmol), MgO (1.84 g, 45.68 mmol), Rh.sub.2(OAc).sub.4 (252 mg, 0.57 mmol) and PhI(OAC).sub.2 (5.52 g, 17.13 mmol) were added and the reaction mixture was stirred at RT overnight. After completion of the reaction (monitored by TLC), the reaction mixture was filtered through celite and the filtrate was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 16-18% EtOAc in pet ether) to afford the title compound. Yield: 86% (2.8 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.03 (s, 1H), 8.48-8.46 (m, 1H), 7.96-7.93 (m, 1H), 3.91 (s, 3H). LCMS: (Method B) 190.9 (M-CF.sub.3CO), Rt. 2.6 min, 96.4% (Max).

Intermediate 18: 1-(4-(methylthio)phenyl)piperazine Hydrochloride

[0200] ##STR00051##

Step 1: tert-butyl 4-(4-(methylthio)phenyl)piperazine-1-carboxylate

[0201] ##STR00052##

[0202] To a degassed stirred solution of (4-bromophenyl)(methyl)sulfane (5.0 g, 24.6 mmol), 1-Boc piperazine (4.6 g, 24.6 mmol), Davephos (2.63 g, 6.66 mmol, Combi-blocks) and KO.sup.tBu (4.7 g, 49.0 mmol) in 1, 4 dioxane (10 mL), Pd(dba).sub.3 (0.45 g, 0.4 mmol) was added at RT. The reaction mixture was heated under microwave irradiation at 120° C. for 15 min. Completion of the reaction was monitored by TLC, the reaction mixture was then evaporated at 50° C. under reduced pressure. To the resulting crude mixture, water (10 mL) was added and the aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 50% EtOAc in pet-ether) to afford the tittle compound. Yield: 88% (6.0 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.25-7.23 (m, 2H), 6.96-6.93 (m, 2H), 3.58-3.57 (m, 4H), 3.12-3.09 (m, 4H), 2.42 (s, 3H), 1.50 (s, 9H). LCMS: (Method A) 309.2 (M+H), Rt. 4.3 min, 98.7% (Max).

Step-2: 1-(4-(methylthio)phenyl)piperazine Hydrochloride

[0203] ##STR00053##

[0204] To a stirred solution of tert-butyl 4-(4-(methylthio)phenyl)piperazine-1-carboxylate (6.0 g, 19.41 mmol) in 1, 4 dioxane (20 mL), HCl solution in dioxane (4M, 20 mL) was added at 0° C. and the reaction mixture was stirred for 4 h at RT. Completion of the reaction was monitored by TLC, then the reaction mixture was evaporated under reduced pressure to afford the tittle compound. Yield: 89% (4.8 g, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.5 (m, 2H), 7.22-7.16 (m, 2H), 7.06-6.93 (m, 2H), 3.02-2.99 (m, 4H), 2.51-2.38 (m, 4H), 2.38 (s, 3H).

Example 22: (2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0205] ##STR00054##

[0206] To a stirred solution of Intermediate 6 (0.12 g, 0.51 mmol) in DMF (1.2 mL, 10 V), TEA (0.23 mL, 1.68 mmol) and intermediate 10 (0.16 g, 5.60 mmol) were added and the reaction mixture was stirred at RT overnight. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 40% EtOAc in pet ether) to obtain the pure intermediate N-((2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(methyl)(oxo)-λ.sup.6-sulfanylidene)-2,2,2-trifluoroacetamide. Yield: 87% (0.21 g, off-white solid).

[0207] To this intermediate, methanol (2.2 mL, 20 V) and K.sub.2CO.sub.3 (0.21 g, 1.68 mmol) were added and the resulting mixture was stirred for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (50 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in EtOAc) to afford the title compound. Yield: 15% (30 mg, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.38 (s, 1H), 8.65 (s, 2H), 8.11 (d, J=8.4 Hz, 1H), 8.02 (d, J=1.2 Hz, 1H), 7.50 (dd, J=8.2, 1.2 Hz, 1H), 4.22 (s, 1H), 3.85-3.83 (m, 4H), 3.68 (d, J=6.4 Hz, 1H), 3.06 (d, J=0.8 Hz, 3H), 2.52-2.32 (m, 4H), 1.41 (d, J=6.8 Hz, 3H). LCMS: (Method A) 403.3 (M+H), Rt. 1.8 min, 97.5% (Max). HPLC: (Method A) Rt. 1.9 min, 95.9% (Max).

Example 23: (2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(ethyl)(imino)-λ.SUP.6.-sulfanone

[0208] ##STR00055##

[0209] To a stirred solution of intermediate 6 (0.25 g, 1.01 mmol) in DMF (2.50 mL, 10 V), TEA (0.4 mL, 3.03 mmol) and intermediate 13 (0.30 g, 1.01 mmol) were added and the reaction mixture was stirred at RT overnight. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 40% EtOAc in pet ether) to obtain the pure intermediate N-((2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(ethyl)(oxo)-λ.sup.6-sulfanylidene)-2,2,2-trifluoroacetamide. Yield: 88% (0.45 g, off-white solid).

[0210] To this intermediate, methanol (2.5 mL, 20 V) and K.sub.2CO.sub.3 (0.40 g, 3.23 mmol) were added and the resulting mixture was stirred for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (50 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in EtOAc) to afford the title compound. Yield: 18% (60 mg, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.38 (s, 1H), 8.58 (s, 2H), 8.12 (d, J=8.4 Hz, 1H), 8.02 (s, 1H), 7.51-7.49 (m, 1H), 4.22 (s, 1H), 3.85-3.83 (m, 4H), 3.67 (d, J=6.8 Hz, 1H), 3.12 (t, J=7.6 Hz, 2H), 2.49-2.39 (m, 4H), 1.40 (d, J=6.40 Hz, 3H), 1.07 (t, J=7.20 Hz, 3H). LCMS: (Method A) 417.3 (M+H), Rt. 2.2 min, 99.6% (Max). HPLC: (Method A) Rt. 2.0 min, 97.1% (Max).

Example 24: (2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(propyl)-λ.SUP.6.-sulfanone

[0211] ##STR00056##

[0212] To a stirred solution of intermediate 6 (235 mg, 9.50 mmol) in DMF (2.5 mL, 10 V), TEA (0.5 mL, 3.8 mmol) and intermediate 14 (235 mg, 0.95 mmol) were added at RT and the reaction mixture was stirred overnight at RT. Completion of the reaction was monitored by TLC, then the reaction mixture was evaporated at 50° C. under vacuum. To the resulting mixture, water (2 mL) was added and the aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (silica gel: 230-400 mesh, eluent: 50% EtOAc in pet-ether) to obtain the pure intermediate N-((2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(oxo)(propyl)-λ.sup.6-sulfanylidene)-2,2,2-trifluoroacetamide. Yield: 28% (140 mg, off white solid).

[0213] To this intermediate methanol (7 mL, 20 V) and K.sub.2CO.sub.3 (414 mg, 4.53 mmol) were added and stirred at RT for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (20 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in DCM) to afford the title compound. Yield: 21% (35 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (s, 1H), 8.59 (s, 2H), 8.13 (d, J=8.0 Hz, 1H), 8.03 (s, 1H), 7.51 (d, J=8.4 Hz, 1H), 4.22 (s, 1H), 3.85-3.83 (m, 4H), 3.68 (d, J=6.0 Hz, 1H), 3.17-3.08 (m, 2H), 2.53-2.44 (m, 4H), 1.57-1.51 (m, 2H), 1.41 (d, J=6.40 Hz, 3H), 0.88 (t, J=7.20 Hz, 3H). LCMS: (Method A) 431.3 (M+H), Rt. 2.4 min, 97.2% (Max). HPLC: (Method A) Rt. 2.2 min, 97.6% (Max).

Example 25: (2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(methyl)(methylimino)-λ.SUP.6.-sulfanone

[0214] ##STR00057##

[0215] To a stirred solution of example 22 (0.1 g, 0.25 mmol) in THF (1.0 mL, 10V), NaH (60%) (18 mg, 0.37 mmol) was added at 0° C. and stirred for 15 min. Then Mel (0.04 mL, 0.62 mmol) was added to the reaction mixture in a sealed tube and heated overnight at 90° C. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 5-6% MeOH in DCM) and further purified by Prep. HPLC (Method B) to afford the title compound. Yield: 23% (23 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.38 (s, 1H), 8.55 (s, 2H), 8.11 (d, J=8.4 Hz, 1H), 8.02 (d, J=1.2 Hz, 1H), 7.50 (dd, J=8.2, 1.2 Hz, 1H), 3.86-3.70 (m, 4H), 3.69-3.65 (m, 1H), 3.10 (s, 3H), 2.56-2.51 (m, 2H), 2.50-2.32 (m, 5H), 1.41 (d, J=6.8 Hz, 3H). LCMS: (Method A) 416.8 (M+H), Rt. 1.94 min, 98.9% (Max). HPLC: (Method A) Rt. 1.9 min, 99.7% (Max).

Example 26: (6-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyridin-3-yl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0216] ##STR00058##

[0217] To a stirred solution of intermediate 6 (350 mg, 1.41 mmol) in DMF (3.5 mL), TEA (0.6 mL, 4.25 mmol) and intermediate 15 (446 mg, 1.56 mmol) were added at RT and the reaction mixture was stirred overnight. Completion of the reaction was monitored by TLC, then the reaction mixture was evaporated at 50° C. under vacuum. To the resulting mixture, water (10 mL) was added and the aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (silica gel: 230-400 mesh, eluent: 50% EtOAc in pet-ether) to obtain the pure intermediate N-((6-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyridin-3-yl)(methyl)(oxo)-λ.sup.6-sulfanylidene)-2,2,2-trifluoroacetamide. Yield: 41% (252 mg, off white solid).

[0218] To this intermediate, methanol (7 mL, 20 V) and K.sub.2C03 (414 mg, 4.53 mmol) were added and the resulting mixture was stirred at RT for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (50 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in DCM) to afford the title compound. Yield: 30% (168.89 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.38 (s, 1H), 8.48 (d, J=2.4 Hz, 1H), 8.12 (d, J=8.4 Hz, 1H), 8.02 (d, J=1.2 Hz, 1H), 7.85 (dd, J=9.2, 2.4 Hz, 1H), 7.49 (dd, J=6.8, 1.6 Hz, 1H), 6.87 (d, J=9.2 Hz, 1H), 4.02 (s, 1H), 3.67-3.62 (m, 5H), 3.00 (s, 3H), 2.67-2.33 (m, 4H), 1.41 (d, J=6.40 Hz, 3H). LCMS: (Method A) 402.0 (M+H), Rt. 1.8 min, 97.7% (Max). HPLC: (Method A) Rt. 1.8 min, 97.6% (Max).

Example 27: (2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(ethylimino)(methyl)-λ.SUP.6.-sulfanone

[0219] ##STR00059##

[0220] To a stirred solution of example 22 (0.12 g, 0.51 mmol) in DMF (1.2 mL, 10 V), NaH (60%) (0.23 mg, 1.68 mmol) was added at 0° C. and stirred for 15 min. Then ethyl bromide (0.16 g, 5.6 mmol) was added to the reaction mixture and it was stirred overnight at RT. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude material was purified by prep HPLC (Method B). Yield: 15% (30 mg, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.38 (s, 1H), 8.65 (s, 2H), 8.11 (d, J=8.4 Hz, 1H), 8.02 (d, J=1.2 Hz, 1H), 7.50 (dd, J=8.2, 1.2 Hz, 1H), 3.85-3.83 (m, 4H), 3.68 (q, J=6.4 Hz, 1H), 3.33-3.30 (m, 2H), 3.06 (s, 3H), 2.44-2.33 (m, 4H), 1.41 (d, J=6.80 Hz, 3H) 1.08 (t, J=6.4 Hz, 3H). LCMS: (Method A) 431.3 (M+H), Rt. 2.1 min, 99.7% (Max). HPLC: (Method A) Rt. 1.9 min, 95.9% (Max).

Example 28: (2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(isopropylimino)(methyl)-λ.SUP.6.-sulfanone

[0221] ##STR00060##

[0222] To a stirred solution of example 22 (0.15 g, 0.37 mmol) in DMF (3.0 mL, 10 V), NaH (60%) (17 mg, 0.746 mmol) was added at 0° C. and stirred for 15 min. Then iso-propyl bromide (91 mg, 0.74 mmol) was added to the reaction mixture and the reaction mixture was stirred overnight at RT. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The crude was purified by prep HPLC (Condition Method B). Yield: 8% (12.5 mg, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (d, J=2.0 Hz, 1H), 8.58 (d, J=2.0 Hz, 2H), 8.12 (d, J=8.8 Hz, 1H), 8.03 (s, 1H), 7.50 (d, J=8.8 Hz, 1H), 4.11-4.10 (m, 4H), 3.85 (q, J=6.8 Hz, 1H), 3.18-3.09 (m, 4H), 2.52-2.33 (m, 4H), 1.42 (d, J=6.4 Hz, 3H), 1.02 (d, J=7.2 Hz, 6H). LCMS: (Method A) 445.0 (M+H), Rt. 2.2 min, 96.5% (Max). HPLC: (Method A) Rt. 2.3 min, 97.4% (Max).

Example 29: (2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)((2-methoxyethyl)imino)(methyl)-λ.SUP.6.-sulfanone

[0223] ##STR00061##

[0224] To a stirred solution of example 22 (0.15 g, 0.51 mmol) in DMF (3.0 mL, 10 V), NaH (60%) (0.13 mg, 0.55 mmol) was added at 0° C. and stirred for 15 min. Then methoxymethyl bromide (103 mg, 0.74 mmol) was added and the reaction mixture was stirred overnight at RT. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude was purified by prep HPLC (method B). Yield: 8% (14.3 mg, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.38 (s, 1H), 8.59 (s, 2H), 8.11 (d, J=8.4 Hz, 1H), 8.03 (s, 1H), 7.50 (dd, J=8.4, 1.2 Hz, 1H), 3.85-3.82 (m, 4H), 3.68 (d, J=6.4 Hz, 1H), 3.18 (s, 3H), 3.12 (s, 3H), 2.95-2.82 (m, 2H), 2.50-2.33 (m, 4H), 1.40 (d, J=6.4 Hz, 3H). LCMS: (Method A) 460.9 (M+H), Rt. 2.1 min, 99.1% (Max). HPLC: (Method A) Rt. 2.1 min, 99.1% (Max).

Example 30: (6-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyridin-3-yl)(methyl)(methylimino)-λ.SUP.6.-sulfanone

[0225] ##STR00062##

[0226] To the stirred solution of example 26 (0.11 g, 0.27 mmol) in THF (2 mL), NaH (60%) (0.03 g, 0.55 mmol) was added at 0° C. and stirred for 15 min. Then Mel (0.05 mL, 0.87 mmol) was added to the reaction mixture and stirred overnight at RT. After completion of the reaction (monitored by TLC), the resulting reaction mixture was quenched with ice cold water (2 mL) and the aqueous layer was extracted with EtOAc (2×15 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and evaporated under vacuum. The resulting crude material was purified by Prep HPLC (Method B) to afford the tittle compound. Yield: 23% (27 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (s, 1H), 8.37 (s, 1H), 8.13 (d, J=8.4 Hz, 1H), 8.03 (s, 1H), 7.75 (d, J=9.2 Hz, 1H), 7.51 (d, J=8.4 Hz, 1H), 6.91 (d, J=9.2 Hz, 1H), 3.64-3.57 (m, 5H), 3.05 (s, 3H), 2.44-2.41 (m, 7H), 1.42 (d, J=6.4 Hz, 3H). LCMS: (Method A) 415.8 (M+H), Rt. 1.9 min, 97.5% (Max). HPLC: (Method A) Rt. 2.1 min, 97.3% (Max).

Example 31: ((2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)imino)dimethyl-λ.SUP.6.-sulfanone

[0227] ##STR00063##

Step 1:5-(1-(4-(5-bromopyrimidin-2-yl)piperazin-1-yl)ethyl)benzo[d]thiazole

[0228] ##STR00064##

[0229] To a stirred solution of intermediate 6 (0.5 g, 2.02 mmol) in DMF (10 mL), TEA (0.84 mL, 6.06 mmol) and 5-bromo-2-chloropyrimidine (0.469 g, 2.42 mmol) were added at RT and stirred overnight at 90° C. After completion of the reaction (monitored by TLC), the reaction mixture was evaporated at 45° C. under vacuum and the resulting mixture was dissolved in DCM (10 mL). The organic layer was washed with water (5 mL), brine solution (5 mL), dried over anhydrous Na.sub.2SO.sub.4 and evaporated under vacuum. The resulting crude material was purified by flash column chromatography (Biotage Isolera, 60% EtOAC in pet-ether) to afford the title compound. Yield: 61% (500 mg, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.38 (s, 1H), 8.42 (s, 2H), 8.11 (d, J=8.4 Hz, 1H), 8.01 (s, 1H), 7.49 (d, J=8.0 Hz, 1H), 3.69-3.64 (m, 5H), 2.40-2.33 (m, 4H), 1.40 (d, J=6.4 Hz, 3H). LCMS: (Method A) 406.2 (M+H), Rt. 3.0 min, 99.9% (Max).

Step 2: ((2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)imino)dimethyl-λ.SUP.6.-sulfanone

[0230] ##STR00065##

[0231] To a stirred solution of 5-(1-(4-(5-bromopyrimidin-2-yl)piperazin-1-yl)ethyl)benzo[d]thiazole (300 mg, 0.74 mmol) in dry toluene (6 mL), Pd(OAc).sub.2 (6.6 mg, 0.03 mmol), Ru-phos (27.7 mg, 0.06 mmol), cesium carbonate (727 mg, 2.23 mmol) and S,S-Dimethyl sulphimide (83.2 mg, 0.9 mmol) were added and heated overnight at 110° C. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 8-10% methanol in CHCl.sub.3) to afford the title compound. Yield: 4% (10.7 mg, brown solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (d, J=8.0 Hz, 1H), 8.12 (d, J=8.0 Hz, 1H), 8.03-8.01 (m, 3H), 7.51-7.49 (m, 1H), 3.64-3.59 (m, 4H), 3.37-3.36 (m, 1H), 3.18 (s, 6H), 2.42-2.34 (m, 4H), 1.42 (d, J=8.0 Hz, 3H). LCMS: (Method A) 417.0 (M+H), Rt. 2.1 min, 98.5% (Max). HPLC: (Method A) Rt. 2.1 min, 98.8 (Max).

Example 33: (4-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)phenyl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0232] ##STR00066##

Step 1: 5-(1-(4-(4-(methylthio)phenyl)piperazin-1-yl)ethyl)benzo[d]thiazole

[0233] ##STR00067##

[0234] To a stirred solution of intermediate 18 (1.6 g, 6.56 mmol) and TEA (2.76 mL, 19.67 mmol) in DMF (10 mL), Intermediate 1 (1.29 g, 6.56 mmol) was added at RT and stirred at 70° C. overnight. Completion of the reaction was monitored by TLC, then the reaction mixture was evaporated at 50° C. under vacuum. To the resulting mixture, water (10 mL) was added and the auqeous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% MeOH in DCM) to afford the title compound. Yield: 25% (600 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.94 (s, 1H), 8.13 (d, J=8.4 Hz, 1H), 8.04 (s, 1H), 7.68 (d, J=8.8 Hz, 2H), 7.51 (d, J=8.4 Hz, 1H), 7.01 (d, J=9.2 Hz, 2H), 3.68-3.66 (m, 1H), 3.34-3.30 (m, 4H), 2.37 (s, 3H), 2.68-2.34 (m, 4H), 1.42 (d, J=6.8 Hz, 3H). LCMS: (Method A) 369.9 (M+H), Rt. 2.3 min, 83.3% (Max).

Step 2: 5-(1-(4-(4-(methylsulfinyl)phenyl)piperazin-1-yl)ethyl)benzo[d]thiazole

[0235] ##STR00068##

[0236] To a stirred solution of 5-(1-(4-(4-(methylthio)phenyl)piperazin-1-yl)ethyl)benzo[d]thiazole (700 mg, 1.90 mmol) in DCM (7 mL, 10 V) at 0° C., m-CPBA (722 mg, 2.09 mmol) was added portion wise and stirred for 1 h at 0° C. After completion of the reaction (monitored by TLC), the reaction mixture was quenched with 10% NaHCO.sub.3 solution and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was washed with brine (30 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 60-70% EtOAc in pet ether) to afford the title compound. Yield: 34% (250 mg, pale yellow gummy solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.94 (s, 1H), 8.13 (d, J=8.4 Hz, 1H), 8.04 (s, 1H), 7.68 (d, J=8.8 Hz, 2H), 7.51 (d, J=8.4 Hz, 1H), 7.01 (d, J=9.2 Hz, 2H), 3.68-3.66 (m, 1H), 3.34-3.30 (m, 4H), 2.65 (s, 3H), 2.68-2.34 (m, 4H), 1.42 (d, J=6.80 Hz, 3H). LCMS: (Method A) 386.5 (M+H), Rt. 1.7 min, 83.3% (Max).

Step 3: (4-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)phenyl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0237] ##STR00069##

[0238] To a stirred solution of 5-(1-(4-(4-(methylsulfinyl)phenyl)piperazin-1-yl)ethyl)benzo[d]thiazole (250 mg, 0.65 mmol) in DCM (5 mL, 20 V), trifluoroacetamide (146 mg, 1.30 mmol), MgO (118 mg, 2.59 mmol), Rh.sub.2(OAc).sub.4 (14.32 mg, 0.03 mmol) and PhI(OAc).sub.2 (166 mg, 0.97 mmol) were added and the reaction mixture was stirred overnight at RT. Completion of the reaction was monitored by TLC, then the reaction mixture was filtered through celite and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 55-60% EtOAc in pet ether) to obatin the pure intermediate N-((4-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)phenyl)(methyl)(oxo)-λ.sup.6-sulfanylidene)-2,2,2-trifluoroacetamide. Yield: 8% (25 mg, off white solid).

[0239] To this intermediate, methanol (10 mL, 20 V) and K.sub.2CO.sub.3 (89 mg, 0.648 mmol) were added and stirred for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (50 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in DCM) to afford the title compound. Yield: 6% (4.86 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.94 (s, 1H), 8.13 (d, J=8.4 Hz, 1H), 8.04 (s, 1H), 7.68 (d, J=8.8 Hz, 2H), 7.51 (d, J=8.4 Hz, 1H), 7.01 (d, J=9.2 Hz, 2H), 3.89 (s, 1H), 3.68-3.66 (m, 1H), 3.34-3.30 (m, 4H), 2.97 (s, 3H), 2.68-2.34 (m, 4H), 1.42 (d, J=6.80 Hz, 3H). LCMS: (Method A) 401.0 (M+H), Rt. 1.9 min, 98.2% (Max). HPLC: (Method A) Rt. 1.8 min, 96.9% (Max).

Example 34: (2-(4-((S)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (2-(4-((R)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0240] ##STR00070##

[0241] To a stirred solution of intermediate 7 (400 mg, 1.41 mmol) in ACN (5 mL), TEA (0.6 mL, 4.23 mmol) and intermediate 10 (445 mg, 1.54 mmol) were added at RT and stirred overnight. Completion of the reaction was monitored by TLC, then the reaction mixture was evaporated at 50° C. under vacuum. To the resulting mixture, water (10 mL) was added and the aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (silica gel: 230-400 mesh, eluent: 50% EtOAc in pet-ether) to obtain the pure intermediate N-((6-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyridin-3-yl)(methyl)(oxo)-λ.sup.6-sulfanylidene)-2,2,2-trifluoroacetamide. Yield: 39% (273 mg, off white solid).

[0242] To this intermediate, methanol (7 mL, 20 V) and K.sub.2C03 (414 mg, 4.53 mmol) were added and stirred at RT for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (50 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in DCM) to afford the title compound. Yield: 34% (190 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (s, 1H), 8.65 (s, 2H), 8.12 (d, J=8.4 Hz, 1H), 8.03 (s, 1H), 7.51-7.49 (m, 1H), 4.24 (s, 1H), 3.86-3.83 (m, 4H), 3.69-3.67 (m, 1H), 3.07 (s, 3H), 2.54-2.39 (m, 4H), 1.41 (d, J=6.8 Hz, 3H). LCMS: (Method A) 402.8 (M+H), Rt. 1.8 min, 99.7% (Max). HPLC: (Method A) Rt. 1.8 min, 99.8% (Max).

Example 35: (S)-(2-(4-((S)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (R)-(2-(4-((S)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (S)-(2-(4-((R)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (R)-(2-(4-((R)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0243] ##STR00071##

[0244] To a stirred solution of intermediate 7 (400 mg, 1.41 mmol) in ACN (5 mL), TEA (0.6 mL, 4.23 mmol) and intermediate 11 (445 mg, 1.54 mmol) were added at RT and stirred overnight. Completion of the reaction was monitored by TLC, then the reaction mixture was evaporated at 50° C. under vacuum. To the resulting mixture, water (10 mL) was added and the aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (silica gel: 230-400 mesh, eluent: 50% EtOAc in pet-ether) to obtain the pure intermediate. Yield: 39% (273 mg, off white solid).

[0245] To this intermediate methanol (7 mL, 20 V) and K.sub.2CO.sub.3 (414 mg, 4.53 mmol) were added and stirred at RT for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (50 mL) was added and the aqueus layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in DCM) to afford the title compound. Yield: 10% (15 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (s, 1H), 8.65 (s, 2H), 8.13 (d, J=8.0 Hz, 1H), 8.03 (s, 1H), 7.51-7.49 (m, 1H), 4.24 (s, 1H), 3.86-3.83 (m, 4H), 3.69-3.67 (m, 1H), 3.07 (s, 3H), 2.54-2.39 (m, 4H), 1.41 (d, J=6.8 Hz, 3H). LCMS: (Method A) 403.3 (M+H), Rt. 1.8 min, 99.6% (Max). HPLC: (Method A) Rt. 1.8 min, 99.2% (Max). Chiral SFC: (Method B) Rt 9.3 min, 99.9% (Max). [α].sup.25.sub.D=−107.69, c 0.104 (MeOH).

Example 36: (S)-(2-(4-((S)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (R)-(2-(4-((S)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (S)-(2-(4-((R)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (R)-(2-(4-((R)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0246] ##STR00072##

[0247] To a stirred solution of intermediate 7 (400 mg, 1.41 mmol) in ACN (5 mL), TEA (0.6 mL, 4.23 mmol) and intermediate 12 (445 mg, 1.54 mmol) were added and the reaction mixture was stirred overnight at RT. Completion of the reaction was monitored by TLC, then the reaction mixture was evaporated at 50° C. under vacuum. To the resulting mixture, water (10 mL) was added and the aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (silica gel: 230-400 mesh, eluent: 50% EtOAc in pet-ether) to obtain the pure intermediate. Yield: 39% (273 mg, off white solid).

[0248] To this intermediate, methanol (7 mL, 20 V) and K.sub.2C03 (414 mg, 4.53 mmol) were added and stirred for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (50 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in DCM) to afford the title compound. Yield: 14% (22 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (t, J=2.0 Hz, 1H), 8.65 (t, J=2.0 Hz, 2H), 8.12 (d, J=8.4 Hz, 1H), 8.03 (s, 1H), 7.50 (d, J=8.4 Hz, 1H), 4.24 (s, 1H), 3.84-3.82 (m, 4H), 3.68 (d, J=6.4 Hz, 1H), 3.07 (s, 3H), 2.51-2.34 (m, 4H), 1.41 (d, J=6.4 Hz, 3H). LCMS: (Method A) 403.3 (M+H), Rt. 1.8 min, 93.9% (Max). HPLC: (Method A) Rt. 1.9 min, 94.5% (Max). Chiral SFC: (Method B) Rt 10.2 min, 98.8% (Max). [α].sup.25.sub.D=−18.64, c 0.103 (MeOH).

Example 37: (S)-(2-(4-((S)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(methyl)(methylimino)-λ.SUP.6.-sulfanone or (R)-(2-(4-((S)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(methyl)(methylimino)-λ.SUP.6.-sulfanone or (S)-(2-(4-((R)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(methyl)(methylimino)-λ.SUP.6.-sulfanone or (R)-(2-(4-((R)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(methyl)(methylimino)-λ.SUP.6.-sulfanone

[0249] ##STR00073##

[0250] To a stirred solution of example 35 (150 mg, 0.372 mmol) in DMF (5 mL), NaH (60%) (35.79 mg, 0.74 mmol) was added at 0° C. and stirred for 15 min. Then iodomethane (0.05 mL, 0.74 mmol) was added to the reaction mixture and stirred at RT for 2 h. After completion of the reaction (monitored by TLC), the reaction mixture was quenched with ice cold water (10 mL) and the aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in DCM) to afford the title compound. Yield: 27% (41.2 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (s, 1H), 8.55 (s, 2H), 8.12 (d, J=8.0 Hz, 1H), 8.03 (s, 1H), 7.51 (d, J=1.6, 8.0 Hz, 1H), 3.87-3.84 (m, 4H), 3.71-3.66 (m, 1H), 3.11 (s, 3H), 2.56-2.42 (m, 7H), 1.41 (d, J=6.8 Hz, 3H). LCMS: (Method A) 417.0 (M+H), Rt. 1.9 min, 98.1% (Max). HPLC: (Method A) Rt. 1.9 min, 98.5% (Max).

Example 38: (R)-(2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (S)-(2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0251] ##STR00074##

Step 1: N—((R)-(2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(methyl)(oxo)-λ.SUP.6.-sulfanylidene)-2,2,2-trifluoroacetamide or N—((S)-(2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(methyl)(oxo)-λ.SUP.6.-sulfanylidene)-2,2,2-trifluoroacetamide

[0252] To a stirred solution of intermediate 6 (0.47 g, 1.46 mmol) in ACN (2.0 mL), TEA (0.88 mL, 5.8 mmol) and intermediate 12 (464 mg 1.6 mmol) were added and the reaction mixture was stirred at RT for 30 min. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, 60-80% EtOAc in pet ether) to afford the title compound. Yield: 44% (320 mg, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (s, 1H), 8.75 (s, 2H), 8.13 (d, J=8.4 Hz, 1H), 8.04 (s, 1H), 7.51 (d, J=8.4 Hz, 1H), 3.89 (t, J=4.8 Hz, 4H), 3.76 (s, 3H), 3.70 (d, J=6.8 Hz, 1H), 2.58-2.43 (m, 4H), 1.41 (d, J=6.4 Hz, 3H). LCMS: (Method A) 268.0 (M+H), Rt. 1.9 min, 92.8% (Max). HPLC: (Method A) Rt. 3.8 min, 96.1% (Max).

Step 2: (R)-(2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (S)-(2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0253] To a stirred solution of the product of step 1 (310 mg, 0.62 mmol) in MeOH (2 mL) and DCM (1 mL), K.sub.2CO.sub.3 (200 mg, 1.0 mmol) was added and stirred for 1 h. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 3-4% methanol in DCM) to afford the title compound. Yield: 84% (210 g, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.38 (s, 1H), 8.64 (s, 2H), 8.11 (d, J=8.4 Hz, 1H), 8.02 (s, 1H), 7.49 (dd, J=8.2, 1.2 Hz, 1H), 4.23 (s, 1H), 3.84 (t, J=4.8 Hz, 4H), 3.06 (s, 3H), 2.54-2.41 (m, 4H), 1.40 (d, J=6.4 Hz, 3H). LCMS: (Method A) 403.1 (M+H), Rt. 1.6 min, 99.9% (Max). HPLC: (Method A) Rt. 1.9 min, 99.7% (Max).

Example 39: (R)-(2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (S)-(2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0254] ##STR00075##

[0255] To a stirred solution of intermediate 6 (0.47 g, 1.46 mmol) in ACN (2.0 mL), TEA (0.88 mL, 5.80 mmol) and intermediate 11 (464 mg 1.60 mmol) were added at RT and the reaction mixture was stirred for 30 min at RT. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, 60-80% EtOAc in pet ether) to afford the pure intermediate N—((R)-(2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(methyl)(oxo)-λ.sup.6-sulfanylidene)-2,2,2-trifluoroacetamide or N—((S)-(2-(4-(1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(methyl)(oxo)-λ.sup.6-sulfanylidene)-2,2,2-trifluoroacetamide. Yield: 44% (320 mg, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.39 (s, 1H), 8.75 (s, 2H), 8.13 (d, J=8.4 Hz, 1H), 8.04 (s, 1H), 7.51 (d, J=8.4 Hz, 1H), 3.89 (t, J=4.8 Hz, 4H), 3.76 (s, 3H), 3.70 (d, J=6.8 Hz, 1H), 2.58-2.43 (m, 4H), 1.41 (d, J=6.4 Hz, 3H). LCMS: (Method A) 403.1.0 (M+H), Rt. 1.9 min, 92.8% (Max). HPLC: (Method A) Rt. 3.8 min, 96.1% (Max).

[0256] To a stirred solution of this intermediate (310 mg, 0.62 mol) in MeOH (2 mL) and DCM (1 mL), K.sub.2CO.sub.3 (200 mg, 1.0 mol) was added and stirred for 1 h at RT. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 3-4% methanol in DCM) to afford the title compound. Yield: 84% (210 g, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 9.38 (s, 1H), 8.64 (s, 2H), 8.11 (d, J=8.4 Hz, 1H), 8.02 (s, 1H), 7.49 (dd, J=8.2, 1.2 Hz, 1H), 4.23 (s, 1H), 3.84 (t, J=4.8 Hz, 4H), 3.06 (s, 3H), 2.54-2.41 (m, 4H), 1.40 (d, J=6.4 Hz, 3H). LCMS: (Method A) 403.1 (M+H), Rt. 1.6 min, 99.9% (Max). HPLC: (Method A) Rt. 1.9 min, 99.7% (Max).

Example 40: (S)-(2-(4-((R)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (R)-(2-(4-((R)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (S)-(2-(4-((S)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (R)-(2-(4-((S)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0257] ##STR00076##

[0258] The mixture of two enantiomers obtained from example 39 was separated by SFC (Method H: 20 mM ammonia in methanol, column: YMC Cellulose C). The first eluting peak was concentrated to afford the title compound. Yield: 21% (35 mg, off white solid). .sup.1H NMR: (400 MHz, DMSO-d.sub.6): δ 9.38 (s, 1H), 8.65 (s, 2H), 8.12 (d, J=8.0 Hz, 1H), 8.02 (s, 1H), 7.49 (d, J=8.0 Hz, 1H), 4.23 (s, 1H), 3.84 (d, J=4.4 Hz, 4H), 3.67 (d, J=6.4 Hz, 1H), 3.06 (s, 3H), 2.44-2.40 (m, 2H), 1.41 (d, J=6.40 Hz, 3H). LCMS: (Method A) 403.1 (M+H), Rt 1.6 min, 99.3% (Max). HPLC: (Method A) Rt 1.8 min, 98.9% (Max). Chiral SFC: (Method B) Rt. 8.1 min, 100% (Max).

Example 41: (S)-(2-(4-((R)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-k-sulfanone or (R)-(2-(4-((R)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (S)-(2-(4-((S)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone or (R)-(2-(4-((S)-1-(benzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(imino)(methyl)-λ.SUP.6.-sulfanone

[0259] ##STR00077##

[0260] The mixture of two enantiomers of example 38 was separated by SFC (Method H: 20 mM ammonia in methanol, column: YMC Cellulose C). The first eluting peak was concentrated to afford the title compound. Yield: 28% (46 mg, off white solid). .sup.1H NMR: (400 MHz, DMSO-d.sub.6): δ 9.39 (d, J=1.6 Hz, 1H), 8.66 (d, J=1.6 Hz, 2H), 8.13 (q, J=1.6 Hz, 1H), 8.03 (s, 1H), 7.51 (d, J=8.4 Hz, 1H), 4.25 (s, 1H), 3.85 (m, 4H), 3.69 (d, J=6.8 Hz, 1H), 3.08 (s, 3H), 2.45-2.34 (m, 2H), 1.42 (d, J=6.40 Hz, 3H). LCMS: (Method A) 403.1 (M+H), Rt 1.6 min, 99.7% (Max). HPLC: (Method A), Rt 1.9 min, 99.5% (Max). Chiral SFC: (Method B) Rt. 9.33 min, 100% (Max).

Example 42: Imino(methyl)(2-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)-λ.SUP.6.-sulfanone

[0261] ##STR00078##

[0262] To a stirred solution of intermediate 8 (0.88 g, 3.80 mmol) in DMF (11.0 mL, 10 V), TEA (1.6 mL, 11.41 mmol) and intermediate 10 (1.1 g, 3.80 mmol) were added and the reaction mixture was stirred overnight at RT. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 60% EtOAc in pet ether) to afford the pure intermediate 2,2,2-trifluoro-N-(methyl(2-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(oxo)-λ.sup.6-sulfanylidene)acetamide. Yield: 22% (246 mg, white solid).

[0263] To this intermediate methanol (22.0 mL, 20 V) and K.sub.2CO.sub.3 (1.46 g, 11.41 mmol) were added and stirred for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (50 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in EtOAc) to afford the title compound. Yield: 23% (15 mg, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.65 (s, 2H), 7.97 (d, J=8.0 Hz, 1H), 7.84 (s, 1H), 7.38 (d, J=8.4 Hz, 1H), 4.23 (s, 1H), 3.84 (t, J=4.8 Hz, 4H), 3.63 (d, J=6.8 Hz, 1H), 3.06 (s, 3H), 2.60 (s, 3H), 2.43-2.39 (m, 4H), 1.39 (d, J=6.8 Hz, 3H). LCMS: (Method A) 417.3 (M+H), Rt. 2.1 min, 97.3% (Max). HPLC: (Method A) Rt. 2.2 min, 97.1% (Max).

Example 43: ethyl(imino)(2-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)-λ.SUP.6.-sulfanone

[0264] ##STR00079##

[0265] To a stirred solution of intermediate 8 (0.25 g, 1.01 mmol) in DMF (2.50 mL, 10 V), TEA (0.4 mL, 3.03 mmol) and intermediate 13 were added (0.30 g, 1.01 mmol) at RT and stirred overnight. Completion of the reaction was monitored by TLC, then the reaction mixture was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 40% EtOAc in pet ether) to afford the intermediate N-(ethyl(2-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(oxo)-λ.sup.6-sulfanylidene)-2,2,2-trifluoroacetamide. Yield: 94% (0.48 g, pale yellow gummy solid).

[0266] To this intermediate methanol (2.5 mL, 20 V) and K.sub.2C03 (0.40 g, 3.23 mmol) were added and stirred at RT for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (50 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in EtOAc) to afford the title compound. Yield: 5% (20 mg, white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.58 (s, 2H), 7.97 (d, J=8.4 Hz, 1H), 7.84 (s, 1H), 7.38 (d, J=7.6 Hz, 1H), 4.22 (s, 1H), 3.83 (t, J=4.4 Hz, 4H), 3.65-3.60 (m, 1H), 3.17-3.08 (m, 2H), 2.78 (s, 3H), 2.52-2.32 (m, 4H), 1.38 (d, J=6.4 Hz, 3H), 1.07 (t, J=7.2 Hz, 3H). LCMS: (Method A) 431.3 (M+H), Rt. 2.5 min, 98.2% (Max). HPLC: (Method A) Rt. 2.2 min, 98.3% (Max).

Example 44: Imino(2-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(propyl)-λ.SUP.6.-sulfanone

[0267] ##STR00080##

[0268] To a stirred solution of intermediate 8 (249 mg, 9.50 mmol) in DMF (2.5 mL), TEA (0.5 mL, 3.80 mmol) and intermediate 14 (300 mg, 9.50 mmol) were added at RT and stirred overnight. Completion of the reaction was monitored by TLC, then the reaction mixture was evaporated at 50° C. under vacuum. To the resulting mixture, water (2 mL) was added and the aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (silica gel: 230-400 mesh, eluent: 50% EtOAc in pet-ether) to afford the pure intermediate 2,2,2-trifluoro-N-((2-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(oxo)(propyl)-λ.sup.6-sulfanylidene)acetamide. Yield: 27% (136 mg, off white solid).

[0269] To this intermediate methanol (7 mL, 20 V) and K.sub.2CO.sub.3 (414 mg, 4.53 mmol) were added and stirred for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (20 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in DCM) to afford the title compound. Yield: 18% (26.5 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.59 (s, 2H), 7.97 (d, J=8.0 Hz, 1H), 7.85 (s, 1H), 7.38 (d, J=8.4 Hz, 1H), 4.22 (s, 1H), 3.85-3.83 (m, 4H), 3.66-3.61 (m, 1H), 3.12-3.08 (m, 2H), 2.79 (s, 3H), 2.49-2.39 (m, 2H), 1.57-1.51 (m, 2H), 1.39 (d, J=6.40 Hz, 3H), 0.88 (t, J=7.20 Hz, 3H). LCMS: (Method A) 445.2 (M+H), Rt. 2.2 min, 99.7% (Max). HPLC: (Method A) Rt 2.4 min, 99.7% (Max).

Example 45: methyl(2-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(methylimino)-λ.SUP.6.-sulfanone

[0270] ##STR00081##

[0271] To a stirred solution of example 42 (0.15 g, 0.36 mmol) in THF (1.5 mL, 10V), NaH (60%) (26 mg, 0.54 mmol) was added at 0° C. and stirred for 15 min. Then Mel (0.05 mL, 0.9 mmol) was added to the reaction mixture in a sealed tube and heated overnight at 90° C. After completion of the reaction (monitored by TLC), the reaction mixture was concentrated under vacuum and the resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 5-6% methanol in DCM). The obtained material was further purified by Prep. HPLC (Method B) to afford the title compound. Yield: 9% (13 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.55 (s, 2H), 7.97 (d, J=8.4 Hz, 1H), 7.84 (s, 1H), 7.39 (d, J=8.4 Hz, 1H), 3.85-3.84 (m, 4H), 3.64-3.62 (m, 1H), 3.10 (s, 3H), 2.78 (s, 3H), 2.54-2.53 (m, 2H), 2.46 (s, 3H), 2.44-2.42 (m, 2H), 1.39 (d, J=6.8 Hz, 3H). LCMS: (Method A) 430.8 (M+H), Rt. 2.2 min, 98.7% (Max). HPLC: (Method A) Rt. 2.1 min, 99.3% (Max).

Example 46: imino(methyl)(6-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyridin-3-yl)-λ.SUP.6.-sulfanone

[0272] ##STR00082##

[0273] To a stirred solution of intermediate 8 (350 mg, 1.34 mmol) in DMF (3.5 mL), TEA (0.6 mL, 4.02 mmol) and intermediate 15 (422 mg, 1.47 mmol) were added at RT and stirred overnight. Completion of the reaction was monitored by TLC, then the reaction mixture was evaporated at 50° C. under vacuum. To the resulting mixture, water (10 mL) was added and the aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (silica gel: 230-400 mesh, eluent: 50% EtOAc in pet-ether) to afford the pure intermediate 2,2,2-trifluoro-N-(methyl(6-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyridin-3-yl)(oxo)-λ.sup.6-sulfanylidene)acetamide. Yield: 40% (241 mg, off white solid).

[0274] To this intermediate methanol (7 mL, 20 V) and K.sub.2CO.sub.3 (414 mg, 4.53 mmol) were added and stirred for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (50 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in DCM) to afford the title compound. Yield: 30% (163.7 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.48 (d, J=2.4 Hz, 1H), 7.96 (d, J=8.4 Hz, 1H), 7.86-7.84 (m, 2H), 7.38 (dd, J=8.0, 1.2 Hz, 1H), 6.87 (d, J=9.2 Hz, 1H), 4.02 (s, 1H), 3.63-3.59 (m, 5H), 3.00 (s, 3H), 2.78 (s, 3H), 2.54-2.49 (m, 2H), 2.43-2.37 (m, 2H), 1.38 (d, J=6.8 Hz, 3H). LCMS: (Method A) 415.8 (M+H), Rt. 2.1 min, 99.0% (Max). HPLC: (Method A) Rt. 2.1 min, 99.2% (Max).

Example 47: methyl(6-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyridin-3-yl)(methylimino)-λ.SUP.6.-sulfanone

[0275] ##STR00083##

[0276] To the stirred solution of example 46 (0.11 g, 0.26 mmol) in THF (2 mL), NaH (60%) (0.03 g, 0.52 mmol) was added at 0° C. and stirred for 15 min. Then Mel (0.05 mL, 0.79 mmol) was added to the reaction mixture and stirred at RT overnight. After completion of the reaction (monitored by TLC), the reaction mixture was quenched with ice cold water (2 mL) and the aqueous layer was extracted with EtOAc (2×15 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and evaporated under vacuum. The resulting crude material was purified by Prep HPLC (Method B) to afford the tittle compound. Yield: 15% (17 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.37 (d, J=2.4 Hz, 1H), 7.97 (d, J=8.4 Hz, 1H), 7.85 (s, 1H), 7.76-7.73 (m, 1H), 7.39 (d, J=8.4 Hz, 1H), 6.91 (d, J=9.2 Hz, 1H), 3.63-3.58 (m, 5H), 3.04 (s, 3H), 2.79 (s, 3H), 2.51-2.48 (m, 2H), 2.44 (s, 3H), 2.44-2.40 (m, 2H), 1.39 (d, J=6.80 Hz, 3H). LCMS: (Method A) 429.8 (M+H), Rt. 2.2 min, 96.2% (Max). HPLC: (Method A) Rt. 2.1 min, 99.6% (Max).

Example 48: (ethylimino)(methyl)(2-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)-λ.SUP.6.-sulfanone

[0277] ##STR00084##

[0278] To the stirred solution of example 42 (150 mg, 0.35 mmol) in THF (1.5 mL), NaH (60%) (19 mg, 0.39 mmol) was added at 0° C. and stirred for 15 min. Then EtI (0.18 mL, 0.54 mmol, 3.0 M in THF) was added and stirred at RT overnight. After the completion of the reaction (monitored by TLC), the resulting reaction mixture was poured into ice cold water (2×50 mL) and the aqueous layer was extracted with EtOAc (2×100 mL). The combined organic layer was washed with brine (50 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 3% MeOH in DCM) to afford the title compound. Yield: 19% (30 mg, pale-yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.56 (s, 2H), 7.97 (d, J=8.0 Hz, 1H), 7.85 (s, 1H), 7.39 (dd, J=8.2, 1.2 Hz, 1H), 3.84 (t, J=4.8 Hz, 4H), 3.63 (d, J=6.4 Hz, 1H), 3.10 (s, 3H), 2.84-2.73 (m, 5H), 2.55-2.39 (m, 4H), 1.39 (d, J=6.4 Hz, 3H), 1.03 (t, J=7.20 Hz, 3H). LCMS: (Method A) 445.0 (M+H), Rt. 2.3 min, 91.3% (Max). HPLC: (Method A) Rt. 2.2 min, 92.0% (Max).

Example 49: (isopropylimino)(methyl)(2-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)-λ.SUP.6.-sulfanone

[0279] ##STR00085##

[0280] To the stirred solution of example 42 (150 mg, 0.35 mmol) in DMF (1.5 mL), NaH (60%) (19 mg, 0.39 mmol) was added at 0° C. and stirred for 15 min. Then isopropyl iodide (0.1 mL, 1.05 mmol) was added and stirred overnight at 60° C. After completion of the reaction (monitored by TLC), the reaction was quenched with the ice cold water (2×50 mL) and the aqueous layer was extracted with EtOAc (2×100 mL). The combined organic layer was washed with brine (50 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by Prep. HPLC (Method A) to afford the title compound. Yield: 8% (11 mg, pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.58 (s, 2H), 7.97 (d, J=8.4 Hz, 1H), 7.85 (s, 1H), 7.39 (dd, J=8.2, 1.2 Hz, 1H), 3.84 (t, J=5.2 Hz, 4H), 3.63 (d, J=6.8 Hz, 1H), 3.15-3.08 (m, 4H), 2.79 (s, 3H), 2.50-2.33 (m, 4H), 1.39 (d, J=6.4 Hz, 3H), 1.05 (d, J=6.4 Hz, 3H), 0.98 (d, J=6.4 Hz, 3H). LCMS: (Method A) 459.0 (M+H), Rt. 2.4 min, 99.3% (Max). HPLC: (Method A) Rt. 2.5 min, 99.3% (Max).

Example 50: imino(methyl)(4-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)phenyl)-λ.SUP.6.-sulfanone

Step 1: 2-methyl-5-(1-(4-(4-(methylthio) phenyl)piperazin-1-yl)ethyl)benzo[d]thiazole

[0281] ##STR00086##

[0282] To a stirred solution of intermediate 18 (1.72 g, 6.12 mmol) in DMF (10 mL), TEA (3.45 mL, 24.4 mmol) and Intermediate 2 (1.30 g, 6.12 mmol) were added at RT and stirred overnight at 70° C. After completion of the reaction (monitored by TLC), the reaction mixture was evaporated at 50° C. under vacuum. To the resulting mixture, water (10 mL) was added and the aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% MeOH in DCM) to afford tittle compound. Yield: 39% (900 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.13 (d, J=8.4 Hz, 1H), 8.04 (s, 1H), 7.68 (d, J=8.8 Hz, 2H), 7.51 (d, J=8.4 Hz, 1H), 7.01 (d, J=9.2 Hz, 2H), 3.68-3.66 (m, 1H), 3.34-3.30 (m, 4H), 2.96 (s, 3H) 2.37 (s, 3H), 2.68-2.34 (m, 4H), 1.42 (d, J=6.8 Hz, 3H). LCMS: (Method A) 384.3 (M+H), Rt. 2.3 min, 83.3% (Max).

Step 2: 2-methyl-5-(1-(4-(4-(methylsulfinyl)phenyl)piperazin-1-yl)ethyl)benzo[d]thiazole

[0283] ##STR00087##

[0284] To a stirred solution of 2-methyl-5-(1-(4-(4-(methylthio)phenyl)piperazin-1-yl)ethyl)benzo[d]thiazole (850 mg, 2.21 mmol) in DCM (7 mL, 10 V), m-CPBA (0.5 g, 2.88 mmol) was added portion wise at 0° C. for 60 min. After completion of the reaction (monitored by TLC), the reaction mixture was quenched with 10% NaHCO.sub.3 solution and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was washed with brine (30 mL), dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 60-70% EtOAc in pet ether) to afford the title compound. Yield: 51% (450 mg, pale yellow solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.13 (d, J=8.4 Hz, 1H), 8.04 (s, 1H), 7.68 (d, J=8.8 Hz, 2H), 7.51 (d, J=8.4 Hz, 1H), 7.01 (d, J=9.2 Hz, 2H), 3.68-3.66 (m, 1H), 3.34-3.30 (m, 4H), 2.97 (s, 3H), 2.65 (s, 3H), 2.68-2.34 (m, 4H), 1.42 (d, J=6.8 Hz, 3H). LCMS: (Method A) 400.3 (M+H), Rt. 1.7 min, 83.3% (Max).

Step 3: Imino(methyl)(4-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)phenyl)-λ.SUP.6.-sulfanone

[0285] ##STR00088##

[0286] To a stirred solution of 2-methyl-5-(1-(4-(4-(methylsulfinyl)phenyl)piperazin-1-yl)ethyl)benzo[d]thiazole (420 mg, 1.05 mmol) in DCM (8 mL, 20 V), trifluoroacetamide (240 mg, 2.1 mmol), MgO (404 mg, 4.2 mmol), Rh.sub.2(OAC).sub.4 (24 mg, 0.05 mmol) and PhI(OAc).sub.2 (507 mg, 1.5 mmol) were added at RT and stirred overnight at same temperature. After completion of the reaction (monitored by TLC), the reaction mixture was filtered through celite and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 55-60% EtOAc in pet ether) to afford the pure intermediate 2,2,2-trifluoro-N-(methyl(4-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)phenyl)(oxo)-λ.sup.6-sulfanylidene)acetamide. Yield: 40% (210 mg, off white solid).

[0287] To this intermediate, methanol (10 mL, 20 V) and K.sub.2CO.sub.3 (300 mg, 2.30 mmol) were added and stirred for 20 min. After 20 min, the reaction mixture was filtered through celite and concentrated under vacuum. To the resulting mixture, water (50 mL) was added and the aqueous layer was extracted with DCM (2×100 mL). The combined organic layer was dried over anhydrous Na.sub.2SO.sub.4 and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, gradient: 1-2% methanol in DCM) to afford the title compound. Yield: 4% (16 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 7.98 (d, J=8.0 Hz, 1H), 7.86 (s, 1H), 7.68 (d, J=8.8 Hz, 2H), 7.40 (d, J=8.4 Hz, 1H), 7.01 (d, J=8.8 Hz, 2H), 3.86 (s, 1H), 3.61 (d, J=6.4 Hz, 1H), 3.34-3.28 (m, 4H), 2.97 (s, 3H), 2.80 (s, 3H), 2.59-2.46 (m, 4H), 1.40 (d, J=6.4 Hz, 3H). LCMS: (Method A) 415.2 (M+H), Rt. 2.2 min, 96.5% (Max). HPLC: (Method A) Rt. 2.2 min, 96.0% (Max).

Examples 51, 52, 53 and 54: (S)-imino(methyl)(2-(4-((S)-1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)-λ.SUP.6.-sulfanone and (R)-Imino(methyl)(2-(4-((S)-1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)-λ.SUP.6.-sulfanone and (S)-Imino(methyl)(2-(4-((R)-1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)-λ.SUP.6.-sulfanone and (R)-Imino(methyl)(2-(4-((R)-1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)-λ.SUP.6.-sulfanone

[0288] ##STR00089##

[0289] To a stirred solution of intermediate 8 (1.10 g, 4.20 mmol) in ACN (11 mL), TEA (1.6 mL, 11.5 mmol) and intermediate 10 (1.10 g, 4.00 mmol) were added and RT and the resulting mixture was stirred overnight. After completion of the reaction (monitored by TLC), the resulting mixture was concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 90-95% EtOAc in pet ether) to afford the pure intermediate 2,2,2-trifluoro-N-(methyl(2-(4-(1-(2-methylbenzo[d]thiazol-5-yl)ethyl)piperazin-1-yl)pyrimidin-5-yl)(oxo)-λ.sup.6-sulfanylidene)acetamide. Yield: 61% (1.2 g, off white solid).

[0290] To this intermediate, methanol (2.5 mL) and K.sub.2C03 (500 mg, 0.3.1 mmol) were added and stirred for 15 min. After 15 min, the reaction mixture was filtered through celite and concentrated under vacuum. The resulting crude material was purified by flash chromatography (Biotage Isolera, eluent: 3-4% methanol in DCM) to afford the tittle compound as racemic form. The four enantiomers of this racemic compound were separated by SFC (Method I: Chiral purification mobile phase: 40% 20 mM ammonia in IPA, column: LUX A1, flow rate: 4.0 mL).

[0291] Analysis of the first eluting fraction (example 51); Yield: 12% (55 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.65 (s, 2H), 7.97 (d, J=8.4 Hz, 1H), 7.84 (s, 1H), 7.39 (d, J=8.0 Hz, 1H), 4.23 (s, 1H), 3.85-3.84 (m, 4H), 3.66-3.64 (m, 1H), 3.07 (s, 3H), 2.79 (s, 3H), 2.50-2.43 (m, 4H), 1.39 (d, J=6.8 Hz, 3H). LCMS: (Method A) 416.8 (M+H), Rt. 2.1 min, 99.4% (Max). HPLC: (Method A) Rt. 2.0 min, 99.7% (Max). Chiral SFC: (Method C) Rt. 3.8 min, 100% (Max).

[0292] Analysis of the second eluting fraction (example 52); Yield: 11% (46 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.65 (s, 2H), 7.97 (d, J=8.4 Hz, 1H), 7.84 (s, 1H), 7.39 (d, J=8.0 Hz, 1H), 4.23 (s, 1H), 3.85-3.84 (m, 4H), 3.66-3.64 (m, 1H), 3.07 (s, 3H), 2.79 (s, 3H), 2.50-2.43 (m, 4H), 1.39 (d, J=6.80 Hz, 3H). LCMS: (Method A) 416.8 (M+H), Rt. 2.1 min, 99.2% (Max). HPLC: (Method A) Rt. 2.0 min, 99.7% (Max). Chiral SFC: (Method C) Rt. 4.5 min, 97.6% (Max).

[0293] Analysis of the third eluting fraction (example 53); Yield: 15% (65 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.65 (s, 2H), 7.97 (d, J=8.4 Hz, 1H), 7.84 (s, 1H), 7.39 (d, J=8.0 Hz, 1H), 4.23 (s, 1H), 3.85-3.84 (m, 4H), 3.66-3.64 (m, 1H), 3.07 (s, 3H), 2.79 (s, 3H), 2.50-2.43 (m, 4H), 1.39 (d, J=6.80 Hz, 3H). LCMS: (Method A) 416.8 (M+H), Rt. 2.1 min, 99.4% (Max). HPLC: (Method A) Rt. 2.0 min, 99.4% (Max). Chiral SFC: (Method C) Rt. 4.9 min, 97.4% (Max).

[0294] Analysis of the fourth eluting fraction (example 54); Yield: 17% (75 mg, off white solid). .sup.1H NMR (400 MHz, DMSO-d.sub.6): δ 8.65 (s, 2H), 7.97 (d, J=8.4 Hz, 1H), 7.84 (s, 1H), 7.39 (d, J=8.0 Hz, 1H), 4.23 (s, 1H), 3.85-3.84 (m, 4H), 3.66-3.64 (m, 1H), 3.07 (s, 3H), 2.79 (s, 3H), 2.50-2.43 (m, 4H), 1.39 (d, J=6.80 Hz, 3H). LCMS: (Method A) 416.8 (M+H), Rt. 2.1 min, 98.2% (Max). HPLC: (Method A) Rt. 2.0 min, 97.9% (Max). Chiral SFC: (Method C) Rt. 8.5 min, 98.9% (Max).

Example B01: Pharmaceutical Preparations

[0295] (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 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.

[0296] (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.

[0297] (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 2H.sub.2O, 28.48 g of Na.sub.2HPO.sub.4 12H.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.

[0298] (D) Ointment: 500 mg of an active ingredient according to the invention were mixed with 99.5 g of Vaseline under aseptic conditions.

[0299] (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.

[0300] (F) Coated tablets: Tablets were pressed analogously to (E) and subsequently coated in a conventional manner with a coating of sucrose, potato starch, talc, tragacanth and dye.

[0301] (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.

[0302] (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.

[0303] (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

[0304] X-Ray Powder Diffraction (XRPD)

[0305] 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. [0306] Tube anode: Cu [0307] Generator tension: 40 kV [0308] Tube current: 40 mA [0309] Wavelength alpha1: 1.5406 Å [0310] Wavelength alpha2: 1.5444 Å [0311] Start angle [2 theta]: 5 [0312] End angle [2 theta]: 50 [0313] Continuous scan

[0314] For suspected novel salts a slower scan speed was also used over a range of 4-40°2°.

[0315] Raman Spectroscopy

[0316] Samples were analysed by a Nicolet Almega DXR Dispersive Raman Microscope for its Raman spectrum using the following conditions:

[0317] Exposure Time: 1.0 s

[0318] Acquisition No: 10

[0319] Spectrograph Aperture: 50 μm pinhole

[0320] Grating: 600 lines/mm

[0321] Laser: He—Ne 633 nm 100% power

[0322] Then the measured Raman spectra were corrected by baseline subtraction using the software OMNIC™ v 9.

[0323] Nuclear Magnetic Resonance (NMR)

[0324] The compounds were dissolved in deuterated DMSO at the concentration of 7 mg/mL. The .sup.1H NMR spectra were obtained by Bruker Avance 400 (Bruker, Coventry, UK). The FID files were processed by NMR software MestReNova V8.0. The chemical shifts and integrals of the peaks were analysed.

[0325] Simultaneous Thermal Analysis (STA)

[0326] 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.

[0327] Gravimetric Vapour Sorption (GVS)

[0328] Approximately 10 mg of sample was placed into a wire-mesh vapour sorption balance pan and loaded into an ‘IgaSorp’ vapour sorption balance (Hiden Analytical Instruments). The sample was then dried by maintaining a 0% humidity environment until no further weight change was recorded. Subsequently, the sample was then subjected to a ramping profile from 0-90% RH at 10% RH increments, maintaining the sample at each step until equilibration had been attained (99% step completion). Upon reaching equilibration, the % RH within the apparatus was ramped to the next step and the equilibration procedure repeated. After completion of the sorption cycle, the sample was then dried using the same procedure. The adsorption/desorption cycle was generally repeated a second time in case the sample had changed during the first cycle. The weight change during the sorption/desorption cycles were then monitored, allowing for the hygroscopic nature of the sample to be determined.

Example C02: Method of Preparation of Succinate Salt of Example 35

[0329] A preferred method of preparation of the succinate salt was as follows:

[0330] A compound of Example 35 (3.0 g) and succinic acid (0.97 g) were weighed out into a 20 mL glass vial and ethanol (10 mL) was added to the physical solid mixture. The resulting suspension was heated until a clear solution was obtained which was then temperature-cycled between 40° C. and ambient temperature over 18 hours overnight. During this time crystals were precipitated and had amassed. More ethanol (2 mL) was added to mobilise and the product was filtered at ambient temperature, washed with ethanol (2×5 mL) and dried in a vacuum oven at 50° C. for 24 hours to constant weight. (Yield 3.1 g).

Example C03: Visual Aqueous Solubility

[0331] The succinate salt was weighed into glass vials and water was added in 100 μL portions up to 1 mL then 0.5 mL portions thereafter. The succinate salt had good solubility, completely dissolving in 0.8 mL water (>12.5 mg/mL).

[0332] Characterizing data for the succinate salt is summarized below: [0333] The XRPD pattern is shown on FIG. 1 [0334] The NMR data was consistent with a stoichiometric mono-salt (FIG. 2). [0335] STA showed no weight loss leading up to the melt with onset at 125.5° C. The sample was not hydrated or solvated (FIG. 3). [0336] GVS indicated the sample was only slightly hygroscopic with a reversible weight gain of 1.8% to 80% RH. [0337] There was no change in XRPD following water slurry at 10 mg/200 μL. [0338] There was no change in the X-ray pattern following slurry in IPA/water. [0339] This salt had very good aqueous solubility estimated visually at 12.5 mg/mL [0340] It has no evidence of a tendency to form hydrates [0341] These combined observations would make the succinate salt of compound of Example 35 a suitable candidate for further study and development

Example C04: Fumarate Salt of a Compound of Example 35

[0342] A compound of Example 35 (300 mg) was warmed in ethanol (2 mL) in order to dissolve the solid. Fumaric acid (95 mg) was added to the warm solution and the mixture was stirred efficiently. More ethanol (1 ML) was added. A clear solution was observed initially but a solid was gradually precipitated as the mixture cooled to ambient temperature. The resulting suspension was temperature-cycled between 40° C. and ambient temperature overnight (18-24 hours). The product was filtered, washed with ethanol (2×1 mL) and dried in a vacuum oven at 45° C. to constant weight (Yield 350 mg, 91%).

Example C05: Visual Aqueous Solubility

[0343] The fumarate salt was weighed into glass vials and water was added in 100 μL portions up to 1 mL then 0.5 mL portions thereafter. The fumarate was completely dissolving in 3 mL water (>3.3 mg/mL).

[0344] Characterizing data for the fumarate salt is summarized below: [0345] The XRPD pattern is shown in FIG. 4. No polymorphic form has been found. [0346] The NMR data was consistent with a stoichiometric mono-salt (FIG. 5). [0347] STA showed no weight loss leading up to the melt with onset at 169° C. The sample was not hydrated or solvated (FIG. 6). [0348] GVS indicated the sample was only slightly hygroscopic with a reversible marginal weight gain of 2.1% to 80% RH. [0349] There was no change in XRPD following water slurry at 10 mg/200 μL. [0350] There was no change in the X-ray pattern following slurry in IPA/water [0351] The aqueous solubility of the fumarate was measured at 3.3 mg/mL.

Example C06: Comparative Examples

Comparative Example C06-1: Succinate Salt Form 2 Preparation of a Compound of Example 35

[0352] The succinate of Example 35 (200 mg) prepared in example C02 (form 1) was suspended in 2-propanol (2 mL) and heated to dissolve. A few crystals obtained after slow crystallisation form 2-propanol or tetrahydrofuran were added to the warm solution and crystals were precipitated as the mixture cooled to ambient temperature. Excess solvent was allowed to evaporate under nitrogen flow and the product was further dried at 50° C. under vacuum for 24 hours to constant weight. [0353] The XRPD pattern is shown in FIG. 7 [0354] The NMR data was consistent with a stoichiometric mono-salt (FIG. 8). [0355] GVS indicated the sample was slightly hygroscopic with a reversible weight gain of 1.25% to 80% RH. Also, there was a partial conversion to Form 1 evident in the X-ray pattern, obtained post GVS. This demonstrates the thermodynamic instablility of Form 2. [0356] Slurries with Form 1 and Form 2 of the respective salt in ethanol, 90/10 2-propanol/water, 2-propanol and tetrahydrofuran all resulted in complete conversion to Form 1 at ambient temperature and at 40° C. This again demonstrates the thermodynamic instablility of Form 2. [0357] Thus, Form 2 would not meet current regulatory requirements for drug development.

Comparative Example C06-2: Hydrochloride Salt Preparation of a Compound of Example 35

[0358] A compound of Example 35 (300 mg) was warmed in acetone (3 mL) so that the solid dissolved. Hydrochloric acid (5.825 M, 135 μL), prepared by diluting concentrated acid by two, was added to the warm solution and mixed well. An oil separated initially which was scratched using a spatula resulting in the product solidifying within 5-10 minutes. The resulting suspension was temperature-cycled between 40° C. and ambient temperature overnight (18-24 hours). The product was filtered, washed with acetone (2×1 mL) and dried in a vacuum oven at 45° C. for to constant weight. (Yield 194 mg, 57%).

[0359] Characterizing data for the hydrochloride salt are summarized below: [0360] The XRPD pattern is shown in FIG. 9. [0361] STA showed a weight loss of 3.6% between 50° C. and 150° C. This was consistent with the theoretical value for a hydrated version of the salt (FIG. 10). [0362] GVS also indicated the sample was clearly hygroscopic with a reversible weight gain of 3.6% to 70% RH and 4% to 80% RH. [0363] The salt turned into an oily matter following suspension in water. [0364] Due to the above negative properties, this hydrochloride salt would not meet current regulatory requirements for drug development.

Comparative Example C06-3: Benzoate Salt of a Compound of Example 35

[0365] A compound of Example 35 (300 mg) was heated to reflux in acetone (2 mL). Although the solid did not dissolve completely, benzoic acid (100 mg) was added to the warm mixture, and more acetone (1 mL) was added. The mixture was heated again to reflux and a clear solution was obtained. This solution was temperature-cycled between 40° C. and ambient temperature overnight (18 hours), but remained clear. Approximately half the volume of solvent was allowed to evaporate and a solid separated over 24 hours.

[0366] The product was filtered, washed with acetone (2×1 mL) and dried in a vacuum oven at 45° C. to constant weight. (Yield 290 mg, 74%).

[0367] Characterizing data for the benzoate salt is summarized below: [0368] The XRPD pattern is shown in FIG. 11. [0369] The NMR data was consistent with a stoichiometric mono-salt (FIG. 12). [0370] There was a change in XRPD following slurry in water and in IPA/water, indicating that the polymorphic form of this salt is not thermodynamic stable, and therefore not suitable for a pharmaceutical development.

Comparative Example C06-4: Mesylate Salt of a Compound of Example 35

[0371] A compound of Example 35 (300 mg) was warmed in acetone (3 mL) so that the solid dissolved. Methane sulphonic acid (27p) was added to a warm mixture resulting in the initial formation of an oily agglomerate. The mixture was ultrasonicated for about 1 minute and some solid appeared to separate. The mixture was temperature-cycled between 40° C. and ambient temperature overnight (18 hours) and about half of the volume of solvent was allowed to evaporate. A solid product resulted which was filtered and dried in a vacuum oven at 45° C. to constant weight (Yield 95 mg).

[0372] Characterizing data for the mesylate salt is summarized below: [0373] The X-ray pattern for the product was consistent with a mixture of the parent free base and amorphous salt, indicating that the mesylate salt cannot be reproducibly isolated as a solid form. Thus, the mesylate salt of Example 35 is not suitable for pharmaceutical development.

Comparative Example C06-5: Comparative Visual Aqueous Solubility with the Free Base of Example 35

[0374] The free base Example 35 (10 mg) was weighed into glass vials and water was added in 100 μL portions up to 1 mL then 0.5 mL portions thereafter. Solubility was assessed visually following a brief period of equilibration. The free base did not give any indication it was soluble at all in 8 mL water (<<1.25 mg/mL).

[0375] Salts of compounds of formula I with various acids other than succinic acid and fumaric acid did not yield a suitable pharmaceutical properties i.e. have not been soluble, 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.