申请人:Wisconsin Alumni Research Foundation
公开号:US04022768A1
公开(公告)日:1977-05-10
1.alpha.,25-dihydroxycholecalciferol is prepared by reacting 1,5,7-trien-3.beta.,25-diol with a 1,2,4-triazoline-dione derivative represented by the formula: ##STR1## wherein R represents an alkyl group or an aryl or substituted-aryl group; reacting the resulting 1,4-cyclic adduct represented by the general formula ##STR2## wherein R is as defined above, with a peroxide to form a 1.alpha.,2.alpha.-epoxide compound represented by the general formula ##STR3## wherein R is as defined above, reducing the so formed compound with a metal hydride to form cholesta-5,7-diene-1.alpha.,3.beta.,25-triol, irradiating the so formed compound with ultraviolet rays to form 1.alpha.,25-dihydroxyprevitamin D.sub.3, isomerizing the so formed previtamin D.sub.3, and recovering 1.alpha.,25-dihydroxycholecalciferol.
1.alpha.,25-二羟基胆钙化醇是通过将1,5,7-三烯-3-β-25-二醇与由以下公式表示的1,2,4-三唑烷二酮衍生物反应制备的:##STR1## 其中R代表烷基或芳基或取代芳基;反应产生的1,4-环加合物表示为通式##STR2##其中R如上所定义,用过氧化物反应形成1α,2α-环氧化合物,通式表示为##STR3##其中R如上所定义,还原所形成的化合物与金属氢化物反应形成胆甾-5,7-二烯-1α,3β,25-三醇,用紫外线照射所形成的化合物形成1α,25-二羟基前维生素D3,异构化所形成的前维生素D3,并回收1α,25-二羟基胆钙化醇。