申请人:Mallela Sambhu Prasad Sarma
公开号:US20120157683A1
公开(公告)日:2012-06-21
The present invention provides an improved process for the preparation of Dutasteride (I) which comprises: (i) reacting 4-aza-5α-androst-1-en-3-one-17β-carboxylic acid (VII), Formula VII with sulfonic acid anhydride (RSO
2
)
2
O in presence of base to produce an intermediate compound of Formula (XIII), wherein R represents C
1-6
alkyl, C
1-6
halo alkyl, C
6-10
aryl, halo aryl; (ii) condensing compound of Formula (XIII) with 2,5-bis(trifluoromethyl)aniline (III), Formula (III) in the presence or absence of a base to produce Dutasteride (I).
本发明提供一种改进的Dutasteride(I)制备方法,其包括:(i)在碱存在下,将4-aza-5α-androst-1-en-3-one-17β-carboxylic acid(VII)(式VII)与磺酸酐(RSO2)2O反应,以产生中间化合物(XIII)(式XIII),其中R代表C1-6烷基,C1-6卤代烷基,C6-10芳基,卤代芳基;(ii)在存在或缺乏碱的情况下,将化合物(XIII)与2,5-双(三氟甲基)苯胺(III)(式III)缩合,以产生Dutasteride(I)。