Process for the preparation of pure citalopram

Details Process for the preparation of pure citalopram Process for the preparation of pure citalopram

2005-02-15

2005-02-15

Dentz, Bernard (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

06855834

ABSTRACT:
A process for the preparation of citalopram of formula (I)in which a compound of formula (II)wherein Z is iodo, bromo, chloro or CF3—(CF2)n—SO2—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.

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