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【结 构 式】 
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【分子编号】20700 【品名】3-fluoro-N-methylaniline; N-(3-fluorophenyl)-N-methylamine 【CA登记号】 |
【 分 子 式 】C7H8FN 【 分 子 量 】125.1456632 【元素组成】C 67.18% H 6.44% F 15.18% N 11.19% |
合成路线1
该中间体在本合成路线中的序号：(XIV)The title compound was synthesized by two related procedures. 3-Fluoro-N-methylaniline (XIV) was obtained from 3-fluoroaniline (XI) by condensation with 1-(hydroxymethyl)benzotriazole (XII), followed by reduction of the anilinomethylbenzotriazole (XIII) with NaBH4. Subsequent condensation with 3-formylbenzoyl chloride (XV) (prepared from the corresponding acid and SOCl2) provided amide (XVI). Then, condensation of (XVI) with piperazine (V) and benzotriazole in the presence of a catalytic amount of Et3N in refluxing toluene furnished (XVII) as a mixture of epimers. 3-Bromophenol (XVIII) was protected as the silyl ether (XIX) with tert-butyldimethylsilyl chloride and imidazole. This compound was converted to the organolithium derivative with n-butyllithium in THF at -78 C, and further transformed to the arylmagnesium reagent (XX) by treatment with magnesium bromide etherate in THF. Condensation of (XVII) with organometallic compound (XX) afforded the benzhydrylpiperazine (XXI) as a 10:1 mixture of epimers. Desilylation of (XXI) by treatment with HCl in aqueous THF, followed by recrystallization of the major isomer from EtOAc/hexane yielded the title compound.
| 【1】 Chang, K.; Boswell, G.E.; Bubacz, D.G.; Collins, M.A.; Davis, A.O.; McNutt, R.W. (Delta Pharmaceuticals, Inc.); Opioid diarylmethylpiperazines and piperidines. JP 1995503247; US 5658908; US 5681830; WO 9315062 . |
| 【2】 Chang, K.-J.; Bishop, M.J.; Bubacz, D.G.; McNutt, R.W. Jr. (Glaxo Wellcome plc); Piperazine cpds. used in therapy. EP 0711289; JP 1997501156; WO 9504051 . |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (V) | 20690 | (2R,5S)-1-allyl-2,5-dimethylpiperazine | C9H18N2 | 详情 | 详情 | |
| (XI) | 20697 | 3-fluoroaniline; 3-fluorophenylamine | 372-19-0 | C6H6FN | 详情 | 详情 |
| (XII) | 20698 | 1H-1,2,3-benzotriazol-1-ylmethanol | 28539-02-8 | C7H7N3O | 详情 | 详情 |
| (XIII) | 20699 | N-(1H-1,2,3-benzotriazol-1-ylmethyl)-3-fluoroaniline; N-(1H-1,2,3-benzotriazol-1-ylmethyl)-N-(3-fluorophenyl)amine | C13H11FN4 | 详情 | 详情 | |
| (XIV) | 20700 | 3-fluoro-N-methylaniline; N-(3-fluorophenyl)-N-methylamine | C7H8FN | 详情 | 详情 | |
| (XV) | 20701 | 3-formylbenzoyl chloride | C8H5ClO2 | 详情 | 详情 | |
| (XVI) | 20702 | N-(3-fluorophenyl)-3-formyl-N-methylbenzamide | C15H12FNO2 | 详情 | 详情 | |
| (XVII) | 20703 | 3-[[(2S,5R)-4-allyl-2,5-dimethylpiperazinyl](1H-1,2,3-benzotriazol-1-yl)methyl]-N-(3-fluorophenyl)-N-methylbenzamide | C30H33FN6O | 详情 | 详情 | |
| (XVIII) | 20704 | 3-bromophenol | 591-20-8 | C6H5BrO | 详情 | 详情 |
| (XIX) | 20705 | (3-bromophenoxy)(tert-butyl)dimethylsilane; 3-bromophenyl tert-butyl(dimethyl)silyl ether | 65423-56-5 | C12H19BrOSi | 详情 | 详情 |
| (XX) | 20706 | bromo(3-[[tert-butyl(dimethyl)silyl]oxy]phenyl)magnesium | C12H19BrMgOSi | 详情 | 详情 | |
| (XXI) | 20707 | 3-[[(2S,5R)-4-allyl-2,5-dimethylpiperazinyl](3-[[tert-butyl(dimethyl)silyl]oxy]phenyl)methyl]-N-(3-fluorophenyl)-N-methylbenzamide | C36H48FN3O2Si | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(XIV)In an alternative procedure, the silylether of 3-bromophenol (XIX) was converted to the organolithium compound (XXII) and then coupled to 3-bromobenzaldehyde (XXIII) in THF at -78 C. The resulting benzhydrol (XXIV) was treated with SOCl2 to give chloride (XXV), which was subsequently condensed with piperazine (V) in refluxing acetonitrile. The diastereomeric mixture of benzhydryl piperazines (XXVI) was desilylated with tetraethylammonium fluoride, and the major isomer (XXVII) was isolated by recrystallization from acetonitrile. The bromo substituent of (XXVII) was then substituted for a cyano group upon treatment with CuCN in N-methylpyrrolidinone at 170 C. Basic hydrolysis of nitrile (XXVIII) gave acid (XXIX), which was protected as the tert-butyldimethylsilyl ether and further converted to acid chloride (XXX) by reaction with oxalyl chloride and a catalytic amount of DMF. Finally, acid chloride (XXX) was condensed with N-methyl-3-fluoroaniline (XIV), and the silyl protecting group was removed by treatment with tetraethylammonium fluoride in acetonitrile.
| 【1】 Chang, K.-J.; Bishop, M.J.; Bubacz, D.G.; McNutt, R.W. Jr. (Glaxo Wellcome plc); Piperazine cpds. used in therapy. EP 0711289; JP 1997501156; WO 9504051 . |
| 【2】 Chang, K.; Boswell, G.E.; Bubacz, D.G.; Collins, M.A.; Davis, A.O.; McNutt, R.W. (Delta Pharmaceuticals, Inc.); Opioid diarylmethylpiperazines and piperidines. JP 1995503247; US 5658908; US 5681830; WO 9315062 . |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (V) | 20690 | (2R,5S)-1-allyl-2,5-dimethylpiperazine | C9H18N2 | 详情 | 详情 | |
| (XIV) | 20700 | 3-fluoro-N-methylaniline; N-(3-fluorophenyl)-N-methylamine | C7H8FN | 详情 | 详情 | |
| (XIX) | 20705 | (3-bromophenoxy)(tert-butyl)dimethylsilane; 3-bromophenyl tert-butyl(dimethyl)silyl ether | 65423-56-5 | C12H19BrOSi | 详情 | 详情 |
| (XXII) | 20708 | (3-[[tert-butyl(dimethyl)silyl]oxy]phenyl)lithium | C12H19LiOSi | 详情 | 详情 | |
| (XXIII) | 10477 | 3-Bromobenzaldehyde; m-Bromobenzaldehyde | 3132-99-8 | C7H5BrO | 详情 | 详情 |
| (XXIV) | 20710 | (3-bromophenyl)(3-[[tert-butyl(dimethyl)silyl]oxy]phenyl)methanol | C19H25BrO2Si | 详情 | 详情 | |
| (XXV) | 20711 | 3-[(3-bromophenyl)(chloro)methyl]phenyl tert-butyl(dimethyl)silyl ether; [3-[(3-bromophenyl)(chloro)methyl]phenoxy](tert-butyl)dimethylsilane | C19H24BrClOSi | 详情 | 详情 | |
| (XXVI) | 20712 | (2R,5S)-1-allyl-4-[(3-bromophenyl)(3-[[tert-butyl(dimethyl)silyl]oxy]phenyl)methyl]-2,5-dimethylpiperazine; 3-[[(2S,5R)-4-allyl-2,5-dimethylpiperazinyl](3-bromophenyl)methyl]phenyl tert-butyl(dimethyl)silyl ether | C28H41BrN2OSi | 详情 | 详情 | |
| (XXVII) | 20713 | 3-[(S)-[(2S,5R)-4-allyl-2,5-dimethylpiperazinyl](3-bromophenyl)methyl]phenol | C22H27BrN2O | 详情 | 详情 | |
| (XXVIII) | 20714 | 3-[(R)-[(2S,5R)-4-allyl-2,5-dimethylpiperazinyl](3-hydroxyphenyl)methyl]benzonitrile | C23H27N3O | 详情 | 详情 | |
| (XXIX) | 20715 | 3-[(R)-[(2S,5R)-4-allyl-2,5-dimethylpiperazinyl](3-hydroxyphenyl)methyl]benzoic acid | C23H28N2O3 | 详情 | 详情 | |
| (XXX) | 20716 | 3-[(R)-[(2S,5R)-4-allyl-2,5-dimethylpiperazinyl](3-[[tert-butyl(dimethyl)silyl]oxy]phenyl)methyl]benzoyl chloride | C29H41ClN2O2Si | 详情 | 详情 |
合成路线3
该中间体在本合成路线中的序号：(III)Reaction of 3-fluoroaniline (I) with formic acid gave formanilide (II), which was reduced by means of LiAlH4 to afford 3-fluoro-N-methylaniline (III). Further alkylation of (III) with benzyl chloride provided the tertiary amine (IV). Vilsmeier-Haack formylation of (IV) with POCl3 and DMF yielded aldehyde (V), which was condensed with nitroethane in the presence of ammonium acetate to give the 2-nitropropene derivative (VI). After reduction of (VI) to the amine (VII) with LiAlH4, condensation with chloroacetyl chloride afforded chloracetamide (VIII). Subsequent displacement of the chlorine of (VIII) with dibenzylamine yielded the tertiary amine (IX). Finally, hydrogenolytic debenzylation of (IX) in the presence of Pd/C furnished the title compound.
| 【1】 Larsson, L.-G.; Florvall, L.; Ross, S.B.; Fagervall, I.; Prodrugs of neuron-selective monoamine oxidase inhibitors: Amino acid derivatives of 1-(4-aminophenyl)-2-aminopropanes. Eur J Med Chem 1999, 34, 2, 137. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| 11296 | 2-Chloroacetyl chloride; Chloroacetic chloride | 79-04-9 | C2H2Cl2O | 详情 | 详情 | |
| 12117 | Nitroethane; 1-Nitroethane | 79-24-3 | C2H5NO2 | 详情 | 详情 | |
| 19171 | 1-(Chloromethyl)benzene; Benzyl chloride | 100-44-7 | C7H7Cl | 详情 | 详情 | |
| (I) | 20697 | 3-fluoroaniline; 3-fluorophenylamine | 372-19-0 | C6H6FN | 详情 | 详情 |
| (II) | 29575 | 3-fluorophenylformamide | C7H6FNO | 详情 | 详情 | |
| (III) | 20700 | 3-fluoro-N-methylaniline; N-(3-fluorophenyl)-N-methylamine | C7H8FN | 详情 | 详情 | |
| (IV) | 29576 | N-benzyl-3-fluoro-N-methylaniline; N-benzyl-N-(3-fluorophenyl)-N-methylamine | C14H14FN | 详情 | 详情 | |
| (V) | 29577 | 4-[benzyl(methyl)amino]-2-fluorobenzaldehyde | C15H14FNO | 详情 | 详情 | |
| (VI) | 29578 | N-benzyl-N-[3-fluoro-4-[(E)-2-nitro-1-propenyl]phenyl]-N-methylamine; N-benzyl-3-fluoro-N-methyl-4-[(E)-2-nitro-1-propenyl]aniline | C17H17FN2O2 | 详情 | 详情 | |
| (VII) | 29579 | N-[4-(2-aminopropyl)-3-fluorophenyl]-N-benzyl-N-methylamine; 4-(2-aminopropyl)-N-benzyl-3-fluoro-N-methylaniline | C17H21FN2 | 详情 | 详情 | |
| (VIII) | 29580 | N-(2-[4-[benzyl(methyl)amino]-2-fluorophenyl]-1-methylethyl)-2-chloroacetamide | C19H22ClFN2O | 详情 | 详情 | |
| (IX) | 29581 | N-(2-[4-[benzyl(methyl)amino]-2-fluorophenyl]-1-methylethyl)-2-(dibenzylamino)acetamide | C33H36FN3O | 详情 | 详情 |