申请人:Puentener Kurt
公开号:US20050070714A1
公开(公告)日:2005-03-31
The present invention is concerned with a novel process for the preparation of compounds of formula I
comprising catalytic asymmetric hydrogenation of a compound of formula (II)
in the presence of a catalyst comprising ruthenium and a chiral diphosphine ligand or comprising rhodium and a chiral diphosphine ligand, wherein R
1
, R
2
, R
3
and R
4
are as defined in the specification and claims. The compounds of formula I and the corresponding salts and/or esters are pharmaceutically active substances.
本发明涉及一种新颖的方法,用于制备化合物I的过程,包括在催化不对称氢化的条件下,以包含钌和手性二膦配体或包含铑和手性二膦配体的催化剂的存在下,对式(II)化合物进行氢化,其中R1、R2、R3和R4如规范和声明中定义。化合物I及其相应的盐和/或酯是具有药理活性的物质。