A 24,25-dihydroxycholestane derivatives of the formula ##STR1## wherein A is a steroid residue and R is an aryl group and a process for preparation of the same are disclosed. The derivatives are an intermediate for synthesis of 24,25-dihydroxycholecalciferol having useful physicological activity like that of vitamin D.sub.3. 24,25-Dihydroxycholecalciferol can be produced in an industrially advantageous method via the intermediate which is easily prepared from commercially available starting compounds.
公开了一种公式为##STR1##的24,25-二羟基胆甾烷衍
生物,其中A是类
固醇残基,R是芳基,并公开了其制备方法。这些衍
生物是合成具有类似于
维生素D.sub.3的有用生理活性的24,25-二羟基胆
钙化醇的中间体。24,25-二羟基胆
钙化醇可以通过这种中间体以工业上有利的方法生产,该中间体可以从市售起始化合物轻松制备。