A novel process for the stereospecific preparation of a 24(R),25- and 24(S),25-dihydroxycholecalciferol. Also provided are novel intermediates used in the above process, being 22-p-toluenesufonyl derivatives of 23,24,25,26,27-pentanorcholecalciferol and of 24(R)- and 24(S),25-dihydroxycholecalciferol.
一种立体特异性制备 24(R),25-和 24(S),25-二羟基胆
钙化醇的新型工艺。 还提供了用于上述工艺的新型中间体,即 23,24,25,26,27-五羟基胆
钙化醇和 24(R)-和 24(S),25-二羟基胆
钙化醇的 22-对
甲苯磺酰基衍
生物。