Novel 1.alpha., 24-dihydroxycholecalciferol and derivatives thereof which are useful with reduced side-effects for the treatment of abnormal metabolism of calcium and phosphorus caused by liver failure, renal failure, gastrointestinal tract failure and parathyroid failure, and related bone diseases. Preparation of the novel 1.alpha., 24-dihydroxycholecalciferol and their derivatives starts from 1.alpha., 24-dihydroxycholesterol prepared by reacting 1.alpha., 2.alpha.-epoxy-24-keto-cholesta-4,6-dien-3-one with an alkali metal and a proton donor in the presence of liquid ammonia or a liquid amine. Reaction of the 1.alpha., 24-dihydroxycholesterol with an allylic brominating agent, followed by contacting with a dehydrobrominating agent, affords 1.alpha.,3.beta., 24-trihydroxycholesta-5,7-diene derivative, which can then be converted to 1.alpha., 24-dihydroxycholocalciferol by ultraviolet irradiation in a organic solvent, followed by isomerization. Processes are also provided for separating 1.alpha., 24-dihydroxycholesterol into an (S)-epimer and an (R)-epimer, and also for separating at least one of 1.alpha., 3.beta., 24(S)-and 1.alpha., 3.beta., 24(R)-trihydroxycholesta-5,7-dienes from trihydroxycholesta-4,6-diene.
Novel 1.alpha., 24-dihydroxycholecalciferol及其衍
生物可用于治疗因肝功能衰竭、肾功能衰竭、胃肠道功能衰竭和甲状旁腺功能衰竭引起的
钙和
磷代谢异常以及相关的骨病,其副作用较少。制备新型1.alpha.,24-二羟基胆
钙化醇及其衍
生物的方法是从1.alpha.,24-二羟基
胆甾醇开始,该
胆甾醇是通过在液
氨或液胺存在下,在碱
金属和质子供体的存在下,将1.alpha.,2.alpha.-环氧-24-酮-
胆甾-4,6-二烯-3-酮反应制备而成。将1.alpha.,24-二羟基
胆甾醇与烯丙基
溴化剂反应,然后与脱
溴化剂接触,得到1.alpha.,3.beta.,24-三羟基胆甾-5,7-二烯衍
生物,然后通过在有机溶剂中进行紫外线照射,随后进行异构化,即可得到1.alpha.,24-二羟基胆
钙化醇。还提供了将1.alpha.,24-二羟基
胆甾醇分离为(S)-表异构体和(R)-表异构体的方法,以及从三羟基
胆甾-4,6-二烯中分离至少1.alpha.,3.beta.,24(S)-和1.alpha.,3.beta.,24(R)-三羟基胆甾-5,7-二烯的方法。