intermediate used for preparing tapentadol or analogues thereof

Abstract

The invention discloses a novel intermediate for preparing tapentadol and analogs thereof, wherein the structural formula is shown as formula I or II, and the groups are defined as the specification. The invention further discloses a method for preparing the novel intermediate and use of the intermediate for preparing tapentadol and analogs thereof. The invention can remarkably improve the product yield and quality of tapentadol, reduce the production cost, and simplify the production procedure. The preparation process is environment friendly, thus more suitable for the requirements of industrial production. ##STR00001##

Claims

1. A compound having following structural formula: ##STR00050## wherein: R.sub.1 is a material selected from halogen, hydroxy, amino, nitrile, nitro, acyl, substituted alkyl, unsubstituted alkyl, substituted cycloalkyl, unsubstituted cycloalkyl, substitute dalkoxyl, unsubstituted alkoxyl, substituted aryl, unsubstituted aryl, substituted aralkyl, unsubstituted aralkyl, substituted heteroaryl, unsubstituted heteroaryl, substituted heteroaralkyl, unsubstituted heteroaralkyl, acyloxy, oxyacyl and sulfonyl; R.sub.2 is a material selected from substituted alkyl, unsubstituted alkyl, substituted cycloalkyl, unsubstituted cycloalkyl, substituted aralkyl, unsubstituted aralkyl, substituted heteroaryl, unsubstituted heteroaryl, substituted heteroaralkyl, and unsubstituted heteroaralkyl.

2. The compound according to claim 1, wherein R.sub.1 is a material selected from F, Cl, Br, CHF.sub.2, CF.sub.3, OH, SO.sub.2CH.sub.3, NH.sub.2, CN, CHO, C.sub.1-6 alkyl, C.sub.1-6 alkoxyl, C.sub.3-7 cycloalkyl, C.sub.1-3 alkylenephenyl, C.sub.1-3 alkylenenaphthyl, tetrahydrofuran or C(O) C.sub.1-6 alkyl, methyl, and methoxy.

3. The compound according to claim 1, wherein the compound is one selected from the following compounds: 2-methyl-3-(3-hydroxyphenyl) pentanenitrile; and 2-methyl-3-(3-methoxyphenyl) pentanenitrile.

4. A method for preparing the compound shown as formula II, characterized in that the reaction route is: ##STR00051## where R.sub.1 and R.sub.2 are defined as claim 1.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

(1) The embodiments below explain the invention more specifically. However, it should be construed that such embodiments are only for explaining the invention by examples, instead of limiting the scope of the invention in any forms.

Embodiment 1

Preparation of diethyl 2-(3-methoxphenyl) propylmalonate

(2) The steps are: add diethyl methylmalonate and anhydrous DMF into a reaction flask, stir well, T=40, add NaH, after 1-hour consecutive reaction dip the DMF solution of 3-(1-bromopropyl) anisole while stirring, stir at 85 for 18 hours, track that the reaction is substantially completed by TLC (developer: petroleum ether/ethyl acetate (8:1)), pour the reaction product in the water, perform extraction by ethyl acetate until the water layer is not fluorescent, wash the organic layer twice by water without drying to obtain a yellow oily product after decompression and concentration, i.e., diethyl 2-(3-methoxphenyl) propylmalonate.

(3) Molecular formula: C.sub.18H.sub.26O.sub.5, molecular weight: 322.4, MS(m/z): 322.

(4) Elementary analysis: theoretical values: C, 67.06%; H, 8.13%; measured values: C, 67.16%; H, 8.19%.

Embodiment 2

Preparation of 2-methyl-3-(3-methoxyphenyl) valeric acid

(5) The steps are: add diethyl 2-(3-methoxphenyl) propylmalonate, ethanol and water into a reaction flask, adjust the pH value to 14 by sodium hydroxide after stirring them well, perform heating reflux reaction, track the reaction by TLC, keep the pH value of the solution at 14, (developer: petroleum ether/ethyl acetate (4:1)), distil ethanol by decompression, and perform extraction twice by ethyl acetate to separate an organic layer out; adjust the pH value of the water layer to 2 to 3 by an acid, perform extraction by ethyl acetate, separate organic layers out, combine the organic layers, and perform drying by anhydrous magnesium sulphate to obtain a yellow oily product after decompression and concentration; add the yellow oily production in a three-neck flask, reflux and heat it in an oil bath of 15 for 5 hours, pour the resultant into the sodium hydroxide solution to make the pH become alkaline, and exact the undissolved substance by ethyl acetate; and adjust the pH of the water layer to 3 by hydrochloric acid, perform extraction by ethyl acetate, and distil a solvent out after drying and decompression to obtain a yellow liquid, i.e., 2-methyl-3-(3-methoxyphenyl) valeric acid.

(6) Molecular formula: C.sub.13H.sub.18O.sub.3, molecular weight: 222.3, MS(m/z): 223 (M.sup.++H).

(7) Elementary analysis: theoretical values: C, 70.24%; H, 8.16%; measured values: C, 70.32%; H, 8.09%.

(8) .sup.1H-NMR (CDCl.sub.3, 500 MHz):

(9) : 7.09 (t, J=8.5 Hz, 1H, ArH), 6.77 (d, J=8.5 Hz, 2H, ArH), 6.77 (d, J=8.5 Hz, 1H, ArH), 3.90 (s, 3H, OCH.sub.3), 3.10 (m, 1H, ArCH), 2.90 (m, 1H, ArCHCHCOOH), 1.62 (m, 2H), 1.19 (d, J=6.5 Hz, 3H), 0.73 (d, J=6.0 Hz, 3H); .sup.13C-NMR (CDCl.sub.3, 125 MHz) : 176.0, 160.1, 139.6, 127.3, 123.1, 116.3, 113.1, 60.3, 56.8, 55.8, 44.5, 26.5, 14.3, 11.2.

Embodiment 3

Preparation of 2-methyl-3-(3-hydroxyphenyl) valeric acid

(10) The steps are: add 2-methyl-3-(3-methoxyphenyl) valeric acid into a reaction flask, add hydroiodic acid, and perform heating and reflux for 12 hours; detect the reaction process by TLC; after that, cool the resultant to the room temperature, pour it into an alkaline solution to make the pH become 9, perform extraction by ethyl acetate, reversely adjust the pH of the water layer to about 3.0 after the water layer is separated out, and add ethyl acetate for extraction; and dry the ethyl acetate extracting solution by anhydrous magnesium sulphate, and recycle the solvent by decompression to obtain a light yellow liquid, 2-methyl-3-(3-hydroxyphenyl) valeric acid.

(11) Molecular formula: C.sub.18H.sub.26O.sub.5, molecular weight: 208.3, MS(m/z): 209 (M.sup.++H).

(12) Elementary analysis: theoretical values: C, 69.21%; H, 7.74%; measured values: C, 65.35%; H, 7.56%.

Embodiment 4

Preparation of valeryl 2-methyl-3-(3-methoxyphenyl) chloride (compound 1)

(13) The steps are: add 2-methyl-3-(3-hydroxyphenyl) valeric acid into a three-neck flask, add thionyl chloride, perform reflux for 4 hours, detect that the reaction is substantially completed by TLC, (developer: petroleum ether/ethyl acetate (4:1)); and distil a solvent by decompression to obtain valeryl 2-methyl-3-(3-methoxyphenyl) chloride (compound 1).

(14) Molecular formula: C.sub.13H.sub.17ClO.sub.2, molecular weight: 240.7, MS(m/z): 240 (M.sup.+).

(15) Elementary analysis: theoretical values: C, 64.86%; H, 7.12%; measured values: C, 65.02%; H, 7.24%.

Embodiment 5

Preparation of methyl 2-methyl-3-(3-methoxyphenyl) valerate (compound 2)

(16) The steps are: add compound 1 and methanol into a three-neck flask, perform reflux for 5 hours, detect that the reaction is substantially completed by TLC, distil a solvent by decompression to obtain a light yellow oily product, valeryl 2-methyl-3-(3-methoxyphenyl) chloride (compound 2).

(17) Molecular formula: C.sub.14H.sub.20O.sub.3, molecular weight: 236.3, MS(m/z): 236 (M.sup.+).

(18) Elementary analysis: theoretical values: C, 71.16%; H, 8.53%; measured values: C, 71.09%; H, 8.39%.

Embodiment 6

Preparation of N,N-dimethyl-2-methyl-3-(3-methoxyphenyl) valeramide (compound 7)

(19) The step are: add the aqueous solution of dimethylamine (33%) into a three-neck flask, T=10, dip compound 1 and NaOH to make pH=12 to 14; after that, keep performing the reaction at the room temperature for 2 hours; perform extraction twice by ethyl acetate, prepare the organic phase, rinse twice by 10% hydrochloric acid, and perform drying by anhydrous magnesium sulfate; recycle the solvent by decompression to obtain a light yellow oily product which is dissolved by isopropanol; and add a seed crystal to obtain a white solid, N,N-dimethyl-2-methyl-3-(3-methoxyphenyl) valeramide (compound 7).

(20) Molecular formula: C.sub.15H.sub.23NO.sub.2, molecular weight: 249.4, MS(m/z): 249 (M.sup.+).

(21) Elementary analysis: theoretical values: C, 72.25%; H, 9.30%; N, 5.62%; measured values: C, 72.31%; H, 9.35%; N, 5.73%.

Embodiment 7

Preparation of N,N-dimethyl-2-methyl-3-(3-hydroxyphenyl) valeramide (compound 9)

(22) The steps are: add compound 7 into a reaction flask, add hydroiodic acid, perform heating and reflux for 5 hours; detect the reaction process by TLC; after that, cool the resultant to the room temperature, pour it to an alkaline solution to make the pH become 9, and perform extraction by ethyl acetate and rinse by water; and recycle the solvent after drying and decompression to obtain a light yellow liquid, N,N-dimethyl-2-methyl-3-(3-hydroxyphenyl) valeramide (compound 9).

(23) Molecular formula: C.sub.14H.sub.21NO.sub.2, molecular weight: 235.3, MS(m/z): 235 (M.sup.+).

(24) Elementary analysis: theoretical values: C, 71.46%; H, 8.99%; N, 5.95%; measured values: C, 71.33%; H, 9.05%; N, 5.92%.

(25) .sup.1H-NMR (CDCl.sub.3, 500 MHz) : 7.11 (t, J=8.0 Hz, 1H, ArH), 6.74 (d, J=8.0 Hz, 2H, ArH), 6.62 (d, J=8.0 Hz, 1H, ArH), 3.03 (m, 2H, ArCH, ArCHCHCOOH), 2.86 (s, 6H, N(CH.sub.3).sub.2), 1.66 (m, 2H), 1.12 (d, J=6.5 Hz, 3H), 0.75 (d, J=6.0 Hz, 3H); .sup.13C-NMR (CDCl.sub.3, 125 MHz) : 176.0, 158.3, 140.6, 129.3, 121.8, 114.9, 113.6, 59.2, 42.7, 39.4, 26.5, 15.2, 11.1.

Embodiment 8

Preparation of N,N-diethyl-2-methyl-3-(3-methoxyphenyl) valeramide (compound 11)

(26) Compound 11 can be obtained by replacing dimethylamine in Embodiment 6 with diethylamine.

(27) Molecular formula: C.sub.17H.sub.27NO.sub.2, molecular weight: 277.4, MS(m/z): 277 (M.sup.+).

(28) Elementary analysis: theoretical values: C, 73.61%; H, 9.81%; N, 5.05%; measured values: C, 73.43%; H, 9.75%; N, 5.09%.

Embodiment 9

Preparation of N,N-dipropyl-2-methyl-3-(3-methoxyphenyl) valeramide (compound 12)

(29) Compound 12 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 6 with dipropylamine.

(30) Molecular formula: C.sub.19H.sub.31NO.sub.2, molecular weight: 305.5, MS(m/z): 305 (M.sup.+).

(31) Elementary analysis: theoretical values: C, 74.71%; H, 10.23%; N, 4.59%; measured values: C, 74.68%; H, 10.21%; N, 4.61%.

Embodiment 10

Preparation of N,N-diisopropyl-2-methyl-3-(3-methoxyphenyl) valeramide (compound 13)

(32) Compound 13 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 6 with diisopropylamine.

(33) Molecular formula: C.sub.19H.sub.31NO.sub.2, molecular weight: 305.5, MS(m/z): 305 (M.sup.+).

(34) Elementary analysis: theoretical values: C, 74.71%; H, 10.23%; N, 4.59%; measured values: C, 74.74%; H, 10.30%; N, 4.56%.

Embodiment 11

Preparation of 3-(3-methoxyphenyl)-2-methyl-1-(piperidin-1-yl) pentan-1-one (compound 14)

(35) Compound 14 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 6 with piperidine.

(36) Molecular formula: C.sub.18H.sub.27NO.sub.2, molecular weight: 289.4, MS(m/z): 289 (M.sup.+).

(37) Elementary analysis: theoretical values: C, 74.70%; H, 9.40%; N, 4.84%; measured values: C, 74.79%; H, 9.35%; N, 4.77%.

Embodiment 12

Preparation of 3-(3-methoxyphenyl)-2-methyl-1-(4-methylpiperidin-1-yl) pentan-1-one (compound 15)

(38) Compound 15 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 6 with 4-methylpiperidine.

(39) Molecular formula: C.sub.19H.sub.29NO.sub.2, molecular weight: 303.45, MS(m/z): 304 (M.sup.++1).

(40) Elementary analysis: theoretical values: C, 75.21%; H, 9.63%; N, 4.62%; measured values: C, 75.19%; H, 9.57%; N, 4.76%.

Embodiment 13

Preparation of 3-(3-methoxyphenyl)-2-methyl-1-(morpholin-1-yl) pentan-1-one (compound 16)

(41) Compound 16 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 6 with morpholine.

(42) Molecular formula: C.sub.17H.sub.25NO3, molecular weight: 291.39, MS(m/z): 291 (M.sup.+).

(43) Elementary analysis: theoretical values: C, 70.07%; H, 8.65%; N, 4.81%; measured values: C, 70.11%; H, 8.57%; N, 4.79%.

Embodiment 14

Preparation of 3-(3-methoxyphenyl)-2-methyl-1-(pyrrolidin-1-yl) pentan-1-one (compound 17)

(44) Compound 17 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 6 with pyrrolidine.

(45) Molecular formula: C.sub.17H.sub.25NO.sub.2, molecular weight: 275.39, MS(m/z): 275 (M.sup.+).

(46) Elementary analysis: theoretical values: C, 74.14%; H, 9.15%; N, 5.09%; measured values: C, 74.12%; H, 9.17%; N, 4.98%.

Embodiment 15

Preparation of N,N-dimethyl-2-methyl-3-(3-chlorophenyl) valeramide (compound 18)

(47) Compound 18 can be obtained according to the operation of the method by replacing 3-(1-bromopropyl) anisole in Embodiment 1 with 3-(1-bromopropyl) chlorobenzene.

(48) Molecular formula: C.sub.14H.sub.20ClNO, molecular weight: 253.77, MS(m/z): 253 (M.sup.+).

(49) Elementary analysis: theoretical values: C, 66.26%; H, 7.94%; N, 5.52%; measured values: C, 66.32%; H, 8.05%; N, 5.56%.

Embodiment 16

Preparation of N,N-diethyl-3-(3-chlorophenyl)-2-methyl valeramide (compound 19)

(50) Compound 19 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 12 with diethylamine.

(51) Molecular formula: C.sub.16H.sub.24ClNO, molecular weight: 281.83, MS(m/z): 281 (M.sup.+).

(52) Elementary analysis: theoretical values: C, 68.19%; H, 8.58%; N, 4.97%; measured values: C, 68.22%; H, 8.65%; N, 4.86%.

Embodiment 17

Preparation of 3-(3-chlorophenyl)-2-methyl-N,N-dipropyl valeramide (compound 20)

(53) Compound 20 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 12 with dipropylamine.

(54) Molecular formula: C.sub.18H.sub.28ClNO, molecular weight: 309.88, MS(m/z): 309 (M.sup.+).

(55) Elementary analysis: theoretical values: C, 69.77%; H, 9.11%; N, 4.52%; measured values: C, 69.83%; H, 9.21%; N, 4.56%.

Embodiment 18

Preparation of 3-(3-chlorophenyl)-2-methyl-N,N-isopropyl valeramide (compound 21)

(56) Compound 21 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 12 with isopropylamine.

(57) Molecular formula: C.sub.17H.sub.24ClNO, molecular weight: 293.84, MS(m/z): 294 (M.sup.+).

(58) Elementary analysis: theoretical values: C, 69.77%; H, 9.11%; N, 4.52%; measured values: C, 69.84%; H, 9.23%; N, 4.59%.

Embodiment 19

Preparation of 3-(3-chlorophenyl)-2-methyl-1-(piperidin-1-yl) pentan-1-one (compound 22)

(59) Compound 22 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 12 with piperidine.

(60) Molecular formula: C.sub.17H.sub.24ClNO, molecular weight: 293.84, MS(m/z): 294 (M.sup.+).

(61) Elementary analysis: theoretical values: C, 69.49%; H, 8.23%; N, 12.07%; measured values: C, 69.44%; H, 8.31%; N, 4.75%.

Embodiment 20

Preparation of 3-(3-chlorophenyl)-2-methyl-1-(4-methylpiperidin-1-yl) pentan-1-one (compound 23)

(62) Compound 23 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 12 with 4-methylpiperidine.

(63) Molecular formula: C.sub.18H.sub.26ClNO, molecular weight: 307.87, MS(m/z): 307 (M.sup.+).

(64) Elementary analysis: theoretical values: C, 70.23%; H, 8.51%; N, 4.55%; measured values: C, 70.22%; H, 8.65%; N, 4.62%.

Embodiment 21

Preparation of 3-(3-chlorophenyl)-2-methyl-1-(morpholin-1-yl) pentan-1-one (compound 24)

(65) Compound 24 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 12 with morpholine.

(66) Molecular formula: C.sub.18H.sub.26ClNO, molecular weight: 307.87, MS(m/z): 307 (M.sup.+).

(67) Elementary analysis: theoretical values: C, 64.97%; H, 7.50%; N, 4.73%; measured values: C, 65.02%; H, 7.55%; N, 4.68%.

Embodiment 22

Preparation of 3-(3-chlorophenyl)-2-methyl-1-(pyrrolidin-1-yl) pentan-1-one (compound 25)

(68) Compound 25 can be obtained according to the operation of the method by replacing dimethylamine in Embodiment 12 with pyrrolidine.

(69) Molecular formula: C.sub.16H.sub.22ClNO, molecular weight: 279.81, MS(m/z): 279 (M.sup.+).

(70) Elementary analysis: theoretical values: C, 68.68%; H, 7.93%; N, 5.01%; measured values: C, 68.70%; H, 7.02%; N, 5.12%.

Embodiment 23

Preparation of 3-(3-methoxy-phenyl)-N,N,2-trimethyl pentylamine

(71) The steps are: add anhydrous ether into a reaction flask, and add lithium aluminum hydride under the condition of ice bath; dip compound 7, control the temperature within 10, after the dipping detect the reaction process by TLC; after the reaction is ended, pour the reaction liquid in the ice water slowly, separate the ether layer out, rinse by water, perform drying, and recycle the solvent by decompression to obtain a light yellow liquid, 3-(3-methoxy-phenyl)-N,N,2-trimethyl pentylamine. Yield: 85%.

(72) Molecular formula: C.sub.15H.sub.25NO, molecular weight: 235.4, MS(m/z): 235 (M.sup.+).

Embodiment 24

Preparation of 3-(3-hydroxy-phenyl)-N,N,2-trimethyl pentylamine

(73) The steps are: add 3-(3-methoxy-phenyl)-N,N,2-trimethyl pentylamine into a reaction flask, add hydroiodic acid, and perform heating and reflux for 5 hours; detect the reaction process by TLC; after that, cool the resultant to the room temperature, pour it to an alkaline solution to make the pH become 9, perform extraction by ethyl acetate and rinse by water; recycle the solvent by drying and decompression to obtain a light yellow liquid, 3-(3-hydroxy-phenyl)-N,N,2-trimethyl pentylamine; and separate the mother solution by a separator, form the salt by the acidification of hydrochloric acid to obtain tapentadol hydrochloride. HPLC: 99.56%, ee %>99.5%.

(74) Molecular formula: C.sub.14H.sub.23NO.HCl, molecular weight: 257.8, MS(m/z): 221 (M.sup.+-HCl).

(75) Elementary analysis: theoretical values: C, 65.23%; H, 9.38%; N, 5.43%; measured values: C, 65.31%; H, 9.35%; N, 5.31%.

(76) .sup.1H-NMR (D.sub.2O, 500 MHz) : 7.15 (t, J=8.0 Hz, 1H, ArH), 6.69 (dd, J=8.0 Hz, 2H, ArH), 6.65 (d, J=8.0 Hz, 1H, ArH), 2.71 (m, 2H, CH.sub.2), 2.62 (s, 6H, N(CH.sub.3).sub.2), 2.20 (m, 1H, CHCH.sub.3), 2.04 (m, 1H, CH), 1.73, 1.42 (m, 2H, CH.sub.2CH.sub.3), 0.96 (d, 3H, CHCH.sub.3), 0.54 (t, 3H, CH.sub.2CH.sub.3).

Embodiment 25

Preparation of 3-(3-methoxy-phenyl)-2-methyl-N,N-diethyl pentylamine

(77) 3-(3-methoxy-phenyl)-2-methyl-N,N-diethyl pentylamine can be obtained by compound 11 according to Embodiment 23.

(78) Molecular formula: C.sub.17H.sub.29NO, molecular weight: 263.4, MS(m/z): 264 (M.sup.++H).

(79) Elementary analysis: theoretical values: C, 77.51%; H, 11.09%; N, 5.31%; measured values: C, 77.39%; H, 11.15%; N, 5.42%.

Embodiment 26

Preparation of (1R,2R)-3-(3-diethylamine-1-ethyl-2-methylpropyl)-phenol hydrochloride

(80) (1R,2R)-3-(3-diethylamine-1-ethyl-2-methylpropyl)-phenol hydrochloride can be obtained by 3-(3-methoxy-phenyl)-2-methyl-N,N-diethyl pentylamine according to Embodiment 24.

(81) Molecular formula: C.sub.16H.sub.27NO.HCl, molecular weight: 285.8, MS(m/z): 249 (M.sup.+-HCl).

(82) Elementary analysis: theoretical values: C, 71.21%; H, 10.46%; N, 5.19%; measured values: C, 71.11%; H, 10.35%; N, 5.21%.

Embodiment 27

Preparation of 3-(3-methoxy-phenyl)-2-methyl-N,N-dipropyl pentylamine

(83) 3-(3-methoxy-phenyl)-2-methyl-N,N-dipropyl pentylamine can be obtained by compound 12 according to Embodiment 23.

(84) Molecular formula: C.sub.19H.sub.33NO, molecular weight: 291.5, MS(m/z): 290 (M.sup.+-H).

(85) Elementary analysis: theoretical values: C, 78.29%; H, 11.41%; N, 4.81%; measured values: C, 78.33%; H, 11.52%; N, 4.76%.

Embodiment 28

Preparation of (1R,2R)-3-(3-dipropylamine-1-ethyl-2-methylpropyl)-phenol hydrochloride

(86) (1R,2R)-3-(3-dipropylamine-1-ethyl-2-methylpropyl)-phenol hydrochloride can be obtained by 3-(3-methoxy-phenyl)-2-methyl-N,N-dipropyl pentylamine according to Embodiment 24.

(87) Molecular formula: C.sub.18H.sub.31NO.HCl, molecular weight: 313.9, MS(m/z): 277 (M.sup.+-HCl).

(88) Elementary analysis: theoretical values: C, 68.87%; H, 10.28%; N, 4.46%; measured values: C, 68.74%; H, 10.33%; N, 4.36%.

Embodiment 29

Preparation of 3-(3-methoxy-phenyl)-2-methyl-N,N-diisopropyl pentylamine

(89) 3-(3-methoxy-phenyl)-2-methyl-N,N-isopropyl pentylamine can be obtained by compound 13 according to Embodiment 23.

(90) Molecular formula: C.sub.19H.sub.33NO, molecular weight: 291.5, MS(m/z): 290 (M.sup.+-H).

(91) Elementary analysis: theoretical values: C, 78.29%; H, 11.41%; N, 4.81%; measured values: C, 78.33%; H, 11.52%; N, 4.76%.

Embodiment 30

Preparation of (1R,2R)-3-(3-diisopropylamine-1-ethyl-2-methylpropyl)-phenol hydrochloride

(92) (1R,2R)-3-(3-isopropylamine-1-ethyl-2-methylpropyl)-phenol hydrochloride can be obtained by 3-(3-methoxy-phenyl)-2-methyl-N,N-dipropyl pentylamine according to Embodiment 24.

(93) Molecular formula: C.sub.18H.sub.31NO.HCl, molecular weight: 313.9, MS(m/z): 277 (M.sup.+-HCl).

(94) Elementary analysis: theoretical values: C, 68.87%; H, 10.28%; N, 4.46%; measured values: C, 68.74%; H, 10.33%; N, 4.36%.

Embodiment 31

Preparation of 1-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-piperidine

(95) 1-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-piperidine can be obtained by compound 14 according to Embodiment 23.

(96) Molecular formula: C.sub.18H.sub.29NO, molecular weight: 275.4, MS(m/z): 275 (M.sup.+).

(97) Elementary analysis: theoretical values: C, 78.49%; H, 10.61%; N, 5.09%; measured values: C, 78.42%; H, 10.55%; N, 5.21%.

Embodiment 32

Preparation of (1R,2R)-3-(1-ethyl-2-methyl-3-piperidin-1-yl-propyl)-phenol hydrochloride

(98) (1R,2R)-3-(1-ethyl-2-methyl-3-piperidin-1-yl-propyl)-phenol hydrochloride can be obtained by 1-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-piperidine according to Embodiment 24.

(99) Molecular formula: C.sub.17H.sub.27NO.HCl, molecular weight: 297.9, MS(m/z): 261 (M.sup.+-HCl).

(100) Elementary analysis: theoretical values: C, 72.44%; H, 10.01%; N, 4.97%; measured values: C, 72.36%; H, 10.15%; N, 5.02%.

Embodiment 33

Preparation of 1-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-4-methyl-piperidine

(101) 1-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-4-methyl-piperidine can be obtained by compound 15 according to Embodiment 23.

(102) Molecular formula: C.sub.19H.sub.33NO, molecular weight: 291.5, MS(m/z): 291 (M.sup.+).

(103) Elementary analysis: theoretical values: C, 78.29%; H, 11.41%; N, 4.80%; measured values: C, 78.31%; H, 11.35%; N, 4.82%.

Embodiment 34

Preparation of (1R,2R)-3-[1-ethyl-2-methyl-3-(4-methyl-piperidin-1-yl)-propyl]-phenol hydrochloride

(104) (1R,2R)-3-[1-ethyl-2-methyl-3-(4-methyl-piperidin-1-yl)-propyl]-phenol hydrochloride can be obtained by 1-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-4-methyl-piperidine according to Embodiment 24.

(105) Molecular formula: C.sub.18H.sub.29NO.HCl, molecular weight: 311.89, MS(m/z): 275 (M.sup.+-HCl).

(106) Elementary analysis: theoretical values: C, 69.31%; H, 9.70%; N, 4.49%; measured values: C, 69.42%; H, 9.72%; N, 4.46%.

Embodiment 35

Preparation of 4-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-morpholine

(107) 4-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-morpholine can be obtained by compound 16 according to Embodiment 23.

(108) Molecular formula: C.sub.17H.sub.27NO.sub.2, molecular weight: 277.4, MS(m/z): 277 (M.sup.+).

(109) Elementary analysis: theoretical values: C, 73.60%; H, 9.81%; N, 5.05%; measured values: C, 73.71%; H, 9.85%; N, 5.01%.

Embodiment 36

Preparation of (1R,2R)-3-(1-ethyl-2-methyl-4-morpholin-4-yl-propyl)-phenol hydrochloride

(110) (1R,2R)-3-(1-ethyl-2-methyl-3-morpholin-4-yl-propyl)-phenol hydrochloride can be obtained by 4-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-morpholine according to Embodiment 24.

(111) Molecular formula: C.sub.16H.sub.27NO.sub.2.HCl, molecular weight: 299.8, MS(m/z): 263 (M.sup.+-HCl).

(112) Elementary analysis: theoretical values: C, 64.09%; H, 8.74%; N, 4.67%; measured values: C, 64.12%; H, 9.79%; N, 4.71%.

Embodiment 35

Preparation of 1-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-pyrrolidine

(113) 1-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-pyrrolidine can be obtained by compound 17 according to Embodiment 23.

(114) Molecular formula: C.sub.17H.sub.27NO, molecular weight: 261.4, MS(m/z): 261 (M.sup.+).

(115) Elementary analysis: theoretical values: C, 78.11%; H, 10.41%; N, 5.35%; measured values: C, 78.24%; H, 10.35%; N, 5.29%.

Embodiment 36

Preparation of (1R,2R)-3-(1-ethyl-2-methyl-3-pyrrolidin-4-yl-propyl)-phenol hydrochloride

(116) (1R,2R)-3-(1-ethyl-2-methyl-3-pyrrolidin-1-yl-propyl)-phenol hydrochloride can be obtained by 1-[3-(3-methoxyphenyl)-2-methyl-pentalkyl]-pyrrolidine according to Embodiment 24.

(117) Molecular formula: C.sub.14H.sub.23NO.HCl, molecular weight: 283.8, MS(m/z): 247 (M.sup.+-HCl).

(118) Elementary analysis: theoretical values: C, 67.70%; H, 9.23%; N, 5.64%; measured values: C, 67.76%; H, 9.31%; N, 5.59%.

Embodiment 37

Preparation of 3-(3-methoxyphenyl)-2-pentanol

(119) The steps are: under the condition of ice bath, add methanol and 3-(3-methoxyphenyl)-2-pentanol into a reaction flask, stir, introduce N.sub.2, after the system is reduced about 0 add 96% sodium borohydride for four times, keep performing the reaction at the temperature for 30 minutes, track that the reaction is substantially completed by TLC, distil the solvent by decompression, pour the reaction product in the water, and perform extraction by ethyl acetate and drying by anhydrous magnesium sulfate to obtain 3-(3-methoxyphenyl)-2-pentanol after decompression and concentration, yield: 99%.

(120) Molecular formula: C.sub.12H.sub.18O2, molecular weight: 194.3, MS(m/z): 195 (M.sup.++H).

(121) Elementary analysis: theoretical values: C, 74.19%; H, 9.34%; measured values: C, 74.22%; H, 9.32%.

Embodiment 38

Preparation of 1-(2-bromopentane)-3-methoxybenzene

(122) The steps are: under the protection of N.sub.2, add 3-(3-methoxyphenyl)-2-pentanol and dichloromethane into a reaction flask, lower the temperature to about 5 by ice bath, dip PBr.sub.3, keep the temperature, stir at the temperature for 1 hour, track that the reaction is substantially completed by TLC, pour the reaction product in the ice water, perform extraction by dichloromethane, rinse the organic layer by the aqueous solution of sodium bicarbonate and then by water, and perform drying by anhydrous magnesium sulfate to obtain 1-(2-bromopentane)-3-methoxybenzene after decompression and concentration, yield: 95%.

(123) Molecular formula: C.sub.12H.sub.17BrO, molecular weight: 256.2, MS(m/z): 257 (M.sup.++H).

(124) Elementary analysis: theoretical values: C, 56.04%; H, 6.66%; measured values: C, 56.11%; H, 6.62%.

Embodiment 39

Preparation of 2-methyl-3-(3-methoxyphenyl) pentanenitrile (compound 43)

(125) The steps are: add sodium cyanide and DMF into a reaction flask, rise the temperature to 85, dip the DMF solution of 1-(2-bromopentane)-3-methoxybenzene, keep the temperature, stir at the temperature for 8 hours, track that the reaction is substantially completed by TLC, and lower the temperature to the room temperature; and pour the reaction liquid in the water, perform extraction by ethyl acetate until the water layer is not fluorescent, and rinse the organic layer twice by water without drying to obtain 2-methyl-3-(3-methoxyphenyl) pentanenitrile after decompression and concentration.

(126) Molecular formula: C.sub.13H.sub.17NO, molecular weight: 203.3, MS(m/z): 204 (M.sup.++H).

(127) Elementary analysis: theoretical values: C, 76.81%; H, 8.43%; measured values: C, 76.75%; H, 8.46%.

(128) The invention has been described in connection with the embodiments. It should be construed that the description and embodiments above are only used for explaining the invention by examples. Various replacements and improvements of the invention can be made by those skilled in the art within the spirit and scope of the invention and should be construed to be within the protection scope of the invention