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 R1, R2, R3 and R4 are as defined in the specification and claims. The compounds of formula (I) and the corresponding salts and/or esters are pharmaceutically active substances.
本发明涉及一种新型的制备公式(I)化合物的方法,包括在
铑和手性二
膦配体或
钌和手性二
膦配体存在的催化剂的存在下,对公式(II)化合物进行催化不对称氢化反应,其中R1,R2,R3和R4如规范和要求中所定义。公式(I)化合物及其相应的盐和/或酯是药物活性物质。