Described is a process for the preparation of compounds of formula (1a) which comprises reacting an isomeric mixture consisting of from 75 to 95% of compound of formula (2a) and from 5 to 25% of a compound of formula (2b) with methylamine, in a suitable solvent, to form a sertraline-imine isomeric mixture consisting of from 75 to 95% of formula (1a) and from 5 to 25% of formula (1b)(A1), or reacting an isomeric mixture consisting of from 75 to 95% of a compound of formula (2a) and from 5 to 25% of a compound of formula (2b) with methylamine, in a suitable solvent, using suitable methods of isolation to form an enriched sertraline-imine isomeric mixture, consisting of >99% of a compound of formula (1a) and <1% of a compound of formula (1b)(A2); and then subjecting the sertraline-imine isomeric mixture obtained according to reaction route (A1) or (A2), in a suitable solvent, to recrystallisation (B), in accordance with scheme (I) wherein in formula (1a), R1, R2 and R3 are each independently of the others hydrogen, halogen, trifluoromethyl or C1-C4alkoxy and formulae (1b), (2a) and (2b) are as defined in the description.
描述了一种制备化合物的过程,其中包括将由75%至95%的式(2a)化合物和由5%至25%的式(2b)化合物组成的异构混合物与
甲胺在适当的溶剂中反应,形成由75%至95%的式(1a)和由5%至25%的式(1b)组成的
盐酸舍曲林亚胺异构混合物(A1),或者将由75%至95%的式(2a)化合物和由5%至25%的式(2b)化合物组成的异构混合物与
甲胺在适当的溶剂中反应,使用适当的分离方法形成富集的
盐酸舍曲林亚胺异构混合物,其中>99%为式(1a)化合物,<1%为式(1b)化合物(A2);然后将根据反应途径(A1)或(A2)获得的
盐酸舍曲林亚胺异构混合物在适当的溶剂中进行再结晶(B),符合方案(I)中的式(1a),其中在式(1a)中,R1、R2和R3分别独立于其他,为
氢、卤素、三
氟甲基或C1-C4烷
氧基,式(1b)、(2a)和(2b)的定义如描述中所述。