24,25-DIHYDROXYCHOLESTANS AND PROCESS FOR PREPARING THE SAME

摘要

A 24,25-dihydroxycholestane derivatives of the formula 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 24,25dihydroxycholecalciferol having useful physicological activity like that of vitamin D3. 24,25-Dihydroxycholecalci-ferol can be produced in an industrially advantageous method via the intermediate which ls easily prepared from commercially available starting compounds.