申请人:Yeda Research & Development Co. Ltd.
公开号:US03966777A1
公开(公告)日:1976-06-29
A process for the production of 1.alpha.-hydroxy provitamin D.sub.3 which comprises treating 1.alpha., 2.alpha.-epoxy-cholesta-4,6-diene-3-one at a low temperature with liquid ammonia; with ammonium chloride and with lithium metal to produce 1.alpha.,3.beta.-dihydroxycholest-6-ene, converting this to the corresponding 1.alpha.,3.beta.-di(lower alkanoyl) derivative, reacting the latter with bromine to give 1.alpha.,3.beta.-di(lower alkanoyloxy) 6.beta.,7.alpha.-dibromocholestane, which is dehydrobrominated to give 1.alpha.,3.beta.-di(lower alkanoyloxy)-cholesta-5,7-diene, which is converted to the desired provitamin. The 1.alpha.,3.beta.-di(lower alkanoyloxy)cholest-6-ene can be oxidized to the corresponding 5-ene-7-one, which is converted to the 7-p-toluenesulfonyl hydrazone derivative, which is converted to the 1.alpha.-hydroxy provitamin D.sub.3 di(lower alkanoyloxy) derivative or to the 1.alpha.-hydroxy provitamin D.sub.3. Novel compounds are 1.alpha.,3.beta.-dihydroxy-cholest-6-ene, its di(lower alkanoyloxy) derivative; 1.alpha.,3.beta.-di(lower alkanoyloxy)-6.beta.,7.alpha.-dibromocholestane; 1.alpha.,3.beta.-diacetoxycholest-5-ene-7-one and the corresponding 7-p-toluenesulfonylhydrazone derivative.
生产1α-羟基原维生素D.sub.3的方法包括将1α,2α-环氧胆甾-4,6-二烯-3-酮在低温下与液氨、氯化铵和锂金属反应,产生1α,3β-二羟基胆甾-6-烯,将其转化为相应的1α,3β-二(较低烷酰)衍生物,将后者与溴反应得到1α,3β-二(较低烷酰氧基)6β,7α-二溴胆甾烷,然后脱溴化得到1α,3β-二(较低烷酰氧基)-胆甾-5,7-二烯,最终转化为所需的原维生素。1α,3β-二(较低烷酰氧基)胆甾-6-烯可以氧化为相应的5-烯-7-酮,再转化为7-对甲苯磺酰肼衍生物,最终转化为1α-羟基原维生素D.sub.3的1α-羟基二(较低烷酰氧基)衍生物或1α-羟基原维生素D.sub.3。新化合物包括1α,3β-二羟基-胆甾-6-烯,其二(较低烷酰氧基)衍生物;1α,3β-二(较低烷酰氧基)-6β,7α-二溴胆甾烷;1α,3β-二乙酰氧基胆甾-5-烯-7-酮及其相应的7-对甲苯磺酰肼衍生物。