申请人:Alfa Chemicals Italiana S.p.A.
公开号:US05808156A1
公开(公告)日:1998-09-15
Process for the production of the isomers (R) and (S)-.alpha.-methyl-3-(trifluoromethyl)benzeneethanamine, the second being useful as intermediate in the synthesis of the anorexic drug dexfenfluramine (INN), which comprises carrying out a stereospecific reductive amination of 1-(3-trifluoromethyl)phenyl-2-propanone with (R) or (S)-.alpha.-methylbenzylamine under a hydrogen atmosphere in the presence of a catalyst and debenzylating the resulting diastereoisomer (R),(R) or (S),(S)-N-(1-phenylethyl)-.alpha.-methyl-3-(trifluoromethyl)benzeneethanam ine by treatment with hydrogen and a catalyst.
生产(R)和(S)-α-甲基-3-(三氟甲基)苯乙胺的异构体的过程,其中第二个在合成压抑食欲药物地芬氟拉明(INN)的中间体中有用,包括在氢气氛下在催化剂存在下进行1-(3-三氟甲基)苯基-2-丙酮与(R)或(S)-α-甲基苄胺的立体特异性还原胺化反应,并通过用氢气和催化剂处理从而脱苄基化产生的顺异构体(R),(R)或(S),(S)-N-(1-苯乙基)-α-甲基-3-(三氟甲基)苯乙胺。