The present invention is directed to novel processes for the preparation of citalopram comprising halogenation of a phthalide compound of formula II, wherein R is a suitable group to be changed to CN, to afford an acid halogenide compound of formula III wherein R is as defined above and X is halogen, and thereafter obtaining citalopram through two successive reactions with suitable organometallic halides or organoboranes or by a reaction with organometallic 4-fluorophenylhalide or 4-fluorophenylborane followed by reduction and alkylation, and an exchange of R to cyano to afford citalopram. The order of the reactions can be varied depending e.g. on the starting compound used.
本发明涉及一种用于制备
西酞普兰的新型工艺,包括对式II的邻苯二酮化合物进行卤代作用,其中R是一个适合改变为CN的基团,以得到式III的酸卤化合物,其中R如上定义,X是卤素,然后通过两个连续反应与适当的有机
金属卤化物或有机
硼烷或通过与有机
金属4-
氟苯基卤化物或4-
氟苯基
硼烷反应后进行还原和烷基化,以及将R交换为
氰基以得到
西酞普兰。反应的顺序可以根据使用的起始化合物等因素进行变化。