The keto group at 7-position of a bile keto acid is stereoselectively reduced to beta-hydroxy group with hydrogen in the presence of nickel, of a base the quantity of which is of at least 0.3 mole to each mole of keto acid, and of an alcohol, having from 3 to 10 C atoms, selected from the group consisting of secondary alcohols, tertiary alcohols and beta-branched alcohols.
在
镍的存在下,使用至少0.3摩尔碱和一个3到10个碳原子的醇,其中包括二级醇、
三级醇和β支链醇,将胆汁
酮酸的7位Keto基立体选择性地还原为β-羟基。