A process for the preparation of citalopram and the pharmaceutically acceptable salts therof is disclosed by reacting 5-cyanophthalide with a 4-fluorophenyl magnesium halide, reducing the 3-hydroxymethyl-4-(4-fluorobenzoyl)benzonitrile with an agent reducing ketones to alcohols, submitting the thus-obtained 3-hydroxymethyl-4-[(4-fluorophenyl)hydroxymethyl) benzonitrile to a cyclization reaction to give 1-(4-fluorophenyl)-1,3-dihydro-5isobenzofurancarbonitrile without 1,1-bis(4-fluorophenyl)-1,3-dihydro-5-isobenzofurancarbonitrile and treating 1,1-bis(4 fluorophenyl)-1,3-dihydro-5-isobenzofurancarbonitrile with a 3-(dimetylamino)propyl halide in the presence of a base.
本发明公开了一种制备
西酞普兰及其药学上可接受的盐的方法,包括将5-
氰基
邻苯二酚与4-
氟苯基
镁卤化物反应,将3-羟甲基-4-(4-
氟苯甲酰)
苯甲腈还原为醇的酮还原剂,将得到的3-羟甲基-4-[(4-
氟苯基)羟甲基]
苯甲腈提交环化反应,得到1-(4-
氟苯基)-1,3-二氢-5-
异苯并呋喃碳腈,没有1,1-双(4-
氟苯基)-1,3-二氢-5-
异苯并呋喃碳腈,并在碱存在下用3-(
二甲氨基)丙基卤化物处理1,1-双(4-
氟苯基)-1,3-二氢-5-
异苯并呋喃碳腈。