A process for the synthesis of 1.alpha.,3.beta.-dihydroxy-.DELTA..sup.5 -steroids from steroids such as 1.alpha.,2.alpha.-epoxy-cholesta-4,6-dien-3-one, which is reacted with lithium in liquid ammonia in the absence of a proton donator and subsequently reduced by repeated alternative additions of a proton donator, said additions being followed in each case by an equivalent amount of lithium. The final product, a 1.alpha.,3.beta.-dihydorxy-.DELTA..sup.5 -steroid, is useful in the synthesis of derivatives of cholecalciferol.
从类
固醇合成1.alpha.,3.beTA.-二羟基-.DELTA..sup.5 -类
固醇的过程,例如1.alpha.,2.alpha.-环氧
胆甾-4,6-二烯-3-酮与液
氨中的
锂在无质子给体的情况下发生反应,随后通过重复交替添加质子给体来还原,每次添加后都跟着等量的
锂。最终产物,1.alpha.,3.beTA.-二羟基-.DELTA..sup.5 -类
固醇,在胆
钙化醇衍
生物的合成中很有用。