申请人:Teijin Limited
公开号:US04199577A1
公开(公告)日:1980-04-22
Novel 1.alpha.,3.beta.-dihydroxy-24-oxocholesta-5,7-diene and the hydroxyl group-protected derivatives thereof. Said novel 1.alpha.-hydroxy-24-oxovitamin D.sub.3 and said novel intermediates are also useful as the intermediates of 1.alpha.,24-dihydroxyvitamin D.sub.3. 1.alpha.,3.beta.-Dihydroxy-24-oxocholesta-5,7-diene and the hydroxyl group-protected derivatives thereof are prepared from fucosterol via 1.alpha.,3.beta.-diprotected hydroxy-24(24)-ethylenedioxycholest-5-ene. 1.alpha.-hydroxy-24-oxovitamin D.sub.3 is prepared by irradiation with ultraviolet rays to 1.alpha.,3.beta.-dihydroxy-24-oxocholesta-5,7-diene or a hydroxyl group-protected derivatives thereof, isomerization using heat energy, and, when necessary, elimination of the protecting groups.
小说1.alpha.,3.beta.-二羟基-24-氧基胆甾-5,7-二烯及其羟基保护衍生物。所述新型1.alpha.-羟基-24-氧基维生素D.sub.3和所述新型中间体也可作为1.alpha.,24-二羟基维生素D.sub.3的中间体。1.alpha.,3.beta.-二羟基-24-氧基胆甾-5,7-二烯及其羟基保护衍生物是通过从岩藻甾醇经由1.alpha.,3.beta.-二保护羟基-24(24)-乙二氧基胆甾-5-烯制备而成。1.alpha.-羟基-24-氧基维生素D.sub.3是通过紫外线辐射1.alpha.,3.beta.-二羟基-24-氧基胆甾-5,7-二烯或其羟基保护衍生物,利用热能异构化以及必要时消除保护基而制备的。