[EN] METHOD FOR THE PREPARATION OF CITALOPRAM<br/>[FR] METHODE DE PREPARATION DU CITALOPRAM
申请人:LUNDBECK & CO AS H
公开号:WO2000023431A1
公开(公告)日:2000-04-27
The present invention relates to a method for the preparation of citalopram or any of its enantiomers and acid addition salts thereof comprising treatment of a compound of formula (IV), wherein X is O or S; R1 - R2 are each independently selected from hydrogen and C¿1-6? alkyl, or R?1 and R2¿ together form a C¿2-5? alkylene chain thereby forming a spiro-ring; R?3¿ is selected from hydrogen and C¿1-6? alkyl, R?4¿ is selected from hydrogen, C¿1-6? alkyl, a carboxy group or a precursor group therefore, or R?3 and R4¿ together form a C¿2-5? alkylene chain thereby forming a spiro-ring, with a dehydration agent or alternatively where X is S, thermally cleavage of the thiazoline ring, or treatment in presence of a radical initiator, to form citalopram. The invention also relates to intermediates used in the new process for the preparation of citalopram, as well as citalopram prepared according to the new process.
本发明涉及一种制备西酞普兰或其任何对映体及其酸盐的方法,包括将式(IV)的化合物处理,其中X为O或S;R1-R2各自独立地选自氢和C1-6烷基,或R1和R2一起形成一个C2-5烷基链,从而形成螺环;R3选自氢和C1-6烷基,R4选自氢、C1-6烷基、羧基或其前体基团,或R3和R4一起形成一个C2-5烷基链,从而形成螺环。使用脱水剂处理或者在X为S的情况下,进行热解开环或者在自由基引发剂的存在下处理,以形成西酞普兰。本发明还涉及用于制备西酞普兰的新工艺中使用的中间体,以及根据新工艺制备的西酞普兰。