A process for the preparation of citalopram of formula (I)
1
in which a compound of formula (II)
2
wherein Z is iodo, bromo, chloro or CF
3
—(CF
2
)
n
—SO
2
—O— n being 0, 1, 2, 3, 4, 5, 6, 7 or 8, is subjected to a cyanide exchange reaction in which the group Z is exchanged with cyanide by reaction with a cyanide source; the resultant crude citalopram product is optionally subjected to some initial purification and the crude citalopram base is subsequently subjected to a film distillation process; the resulting citalopram product is then optionally further purified and worked up and isolated as the base or a pharmaceutically acceptable salt thereof.
一种制备化合物citalopram的方法,其中化合物具有式(I)1,其中化合物具有式(II)2,其中Z为
碘、
溴、
氯或
CF3—(
CF2)n—SO2—O—,n为0、1、2、3、4、5、6、7或8,经过
氰化物交换反应,其中Z基团通过与
氰化物源反应被
氰化物交换;所得的粗citalopram产品可选择性地经过一些初步纯化处理,随后将粗citalopram碱经过薄膜蒸馏过程;然后将得到的citalopram产品可选择性地进一步纯化、加工并作为其碱或药用可接受的盐隔离。