The novel 25-hydroxy-24-oxocholestane derivatives of this invention can easily be converted to 24,25-dihydroxycholecalciferol or 1α,24,25-trihydroxycholecalciferol which is known as useful for medicine controlling the calcium metabolism of warm-blooded animals. Moreover, 25-hydroxy-24-oxocholestane derivatives can be converted to novel 25-hydroxy-24- oxocholecalciferol expressed by the following formula
and novel 1 α,25-dihydroxy-24-oxocholecalciferol of the formula
本发明的新型 25-hydroxy-24-oxocholestane 衍
生物可以很容易地转化为 24,25-二羟基胆
钙化醇或 1α,24,25-三羟基胆
钙化醇,后者是众所周知的用于控制温血动物
钙代谢的药物。此外,25-羟基-24-氧代胆甾烷衍
生物可转化为新型 25-羟基-24-氧代胆
钙化醇,如下式所示
和新型 1 α,25-二羟基-24-氧代胆
钙化醇,其式为