A process for producing a 1.alpha.,3.beta.,24-trihydroxy-.DELTA..sup.5 -steroid represented by the formula (II): ##STR1## wherein R.sub.1 and R.sub.2, independently, represent a hyrogen atom, or R.sub.1 and R.sub.2 together form a single bond, R.sub.3 represents an unsubstituted or halogen-substituted lower alkyl, and R.sub.4 represents a hydrogen atom, hydroxy or a protected hydroxy, comprising reducing a 1.alpha.,2.alpha.-epoxy-.DELTA..sup.4,6 -3,24-dioxosteroid represented by the formula (I) ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 have the same meanings as defined in formula (II), using an alkaline metal or alkaline earth metal and a proton donor in a solvent comprising ammonia or amine characterized in that at an early stage of the reaction, the 1.alpha.,2.alpha.-epoxy-.DELTA..sup.4,6 -3,24-dioxosteroid is reacted with the alkaline metal or alkaline earth metal in the presence of a proton acceptor, and then at a later stage of the reaction, a resulting intermediate product is reacted with the proton donor.
生产1α,3β,24-三羟基-Δ5-类
固醇的方法,该类
固醇由以下结构式(II)表示:其中R.sub.1和R.sub.2分别代表氢原子,或者R.sub.1和R.sub.2一起形成一个单键,R.sub.3代表未取代或卤素取代的低碳链基,R.sub.4代表氢原子、羟基或保护羟基,包括将由以下结构式(I)表示的1α,2α-环氧-Δ4,6-3,24-二氧类
固醇还原为1α,3β,24-三羟基-Δ5-类
固醇,其中R.sub.1、R.sub.2、R.sub.3和R.sub.4的含义与结构式(II)中定义的含义相同,使用含有
氨或胺的溶剂中的碱
金属或碱土
金属和质子给体,其特征在于在反应的早期阶段,1α,2α-环氧-Δ4,6-3,24-二氧类
固醇在质子受体的存在下与碱
金属或碱土
金属发生反应,然后在反应的后期阶段,将得到的中间产物与质子给体发生反应。