申请人:H. Lundbeck A/S
公开号:US06365747B1
公开(公告)日:2002-04-02
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 C1-6 alkyl, or R1 and R2 together form a C2-5 alkylene chain thereby forming a spiro-ring; R3 is selected from hydrogen and C1-6 alkyl, R4 is selected from hydrogen, C1-6 alkyl, a carboxy group or a precursor group therefore, or R3 and R4 together form a C2-5 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一对映体及其酸盐的方法,包括处理化合物(IV)的步骤,其中X为O或S;R1-R2分别独立地选自氢和C1-6烷基,或者R1和R2共同形成一个C2-5烷基链从而形成一个螺环;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,或者R3和R4共同形成一个C2-5烷基链从而形成一个螺环,与脱水剂处理,或者在X为S时,热解噻唑环,或者在存在自由基引发剂的情况下处理,从而形成西酞普兰。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。