The invention relates to a method for the preparation of citalopram comprising reaction of a compound of formula (II) with a compound having the formula (III) wherein R is halogen or -O-SO2-X, wherein X is alkyl, alkenyl, alkynyl or optionally alkyl substituted aryl or aralkyl, and R1 is dimethylamino, halogen, -O-SO¿2?-X wherein X is as defined above, provided that R is not halogen when R?1¿ is dimethylamino; and if R1 is dimethylamino followed by isolation of citalopram base or a pharmaceutically acceptable acid addition salt thereof, and if R1 is halogen or -O-SO¿2?-X, wherein X is as defined above, followed by conversion of the resulting compound of formula wherein R?2¿ is halogen or a group of formula -O-SO¿2?-X wherein X is as defined above to citalopram, followed by isolation of citalopram base or a pharmaceutically acceptable acid addition salt thereof.
本发明涉及一种制备
西酞普兰的方法,包括将式(II)的化合物与具有式(III)的化合物反应,其中R是卤素或-O-SO2-X,X是烷基,烯基,炔基或可选的烷基取代的芳基或芳基烷基,R1是二甲基
氨基,卤素,-O-SO2-X,其中X如上所述,前提是当R1为二甲基
氨基时,R不是卤素;如果R1是二甲基
氨基,则随后分离
西酞普兰碱或其药学上可接受的酸加成盐;如果R1是卤素或-O-SO2-X,其中X如上所述,则随后将式的产物转化为
西酞普兰,其中R2是卤素或式-O-SO2-X,其中X如上所述,然后分离
西酞普兰碱或其药学上可接受的酸加成盐。