申请人:Aurobindo Pharma Limited
公开号:EP2017271A1
公开(公告)日:2009-01-21
The present invention relates to a novel process for the preparation of Escitalopram, which comprises:
(ii) de-methylating (±)-1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-5-isobenzofurancarbonitrile (Formula II) (Citalopram)
to produce (±)-1-[3-(methylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-5-isobenzofurancarbonitrile (desmethyl Citalopram) (XII),
(iii) isolating the pure desmethyl Citalopram (XII),
(iv) separating the enantiomers from the pure desmethyl Citalopram (XII) with an optically active acid to obtain (S)-(+)-1-[3-(methylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-5-isobenzofurancarbonitrile ((S)-(+)-desmethyl Citalopram) (XIII),
(v) methylating an enantiomerically pure compound (XIII) using suitable methylating agent to produce Escitalopram (I).
该发明涉及一种用于制备艾司西酞普兰的新工艺,包括:(ii)去甲基化(±)-1-[3-(二甲氨基)丙基]-1-(4-氟苯基)-1,3-二氢-5-异苯并呋喃碳腈(式II)(西酞普兰)以产生(±)-1-[3-(甲基氨基)丙基]-1-(4-氟苯基)-1,3-二氢-5-异苯并呋喃碳腈(去甲基西酞普兰)(XII),(iii)分离纯的去甲基西酞普兰(XII),(iv)用旋光酸将对映体从纯的去甲基西酞普兰(XII)中分离出来,得到(S)-(+)-1-[3-(甲基氨基)丙基]-1-(4-氟苯基)-1,3-二氢-5-异苯并呋喃碳腈((S)-(+)-去甲基西酞普兰)(XIII),(v)使用适当的甲基化剂对对映体纯化合物(XIII)进行甲基化,以产生艾司西酞普兰(I)。