申请人:Kotobuki Pharmaceutical Co., Ltd.
公开号:EP1988071A1
公开(公告)日:2008-11-05
This invention relates to a process for producing optically active alcohols using asymmetric reduction of aromatic ketones. This process gives optically active alcohols in high enantioselectivity at large scale production. Aromatic ketones represented by formula (I)
[wherein, R1 are selected from hydrogen atom, halogen atom, lower alkyl group etc. R2 is -(CH2)n-R3 [wherein, n is 1 to 5 integer. R3 are selected from hydrogen atom, halogen atom, lower alkoxycarbonyl group etc. and formula (II) and (III).
wherein, R4 is selected from lower alkyl group (1 to 5 carbon atom) etc. R5 and R6 are the same or different and are selected from hydrogen atom, halogen atom, lower alkyl group etc.}]] are reduced by sodium borohydride, chlorotrimethylsilane and optically active 2-[bis(4-methoxyphenyl)hydroxymethyl]pyrrolidine represented by formula (IV)
to give optically active alcohol represented by formula (V) stereoselectively.
(wherein, R1 and R2 are as defined above.)
本发明涉及一种利用芳香酮的不对称还原生产光学活性醇的工艺。该工艺可大规模生产高对映选择性的光学活性醇。式 (I) 所代表的芳香酮
[其中,R1 选自氢原子、卤素原子、低级烷基等。R2 是-(CH2)n-R3[其中,n 是 1 至 5 的整数。R3 选自氢原子、卤素原子、低级烷氧羰基等以及式 (II) 和 (III)。
其中,R4 选自低级烷基(1 至 5 个碳原子)等。R5 和 R6 相同或不同,选自氢原子、卤素原子、低级烷基等}]]通过硼氢化钠、氯三甲基硅烷和光学活性 2-[双(4-甲氧基苯基)羟甲基]吡咯烷还原,由式(IV)代表
立体选择性地得到由式 (V) 代表的光学活性醇。
(其中,R1 和 R2 如上定义)。