A new process is clescribed for obtaining 5-cyanophthalide, which is an intermediate used for the synthesis of citalopram and its active enantiomer S(+) citalopram, both of which are known active ingredients commonly used for treating depression. The process starts from 5-carboxyphthalide which is converted into the corresponding acylochloride. The latter is reacted with hydroxylamine to give the corresponding hydroxamyl phthalide which is subsequently subjected to a dehydration reaction to give 5-cyanophthalide.
一种新的制备5-
氰基
邻苯二甲酸酰亚胺的工艺被描述,该化合物是合成
舒必利和其活性对映体S(+)
舒必利的中间体,两者均为治疗抑郁症常用的活性成分。该工艺从5-羧基
邻苯二甲酸开始,将其转化为相应的酰
氯化合物。然后将酰
氯化合物与
羟胺反应,得到相应的羟
肟基
邻苯二甲酸酰亚胺,随后进行脱
水反应,得到5-
氰基
邻苯二甲酸酰亚胺。