The synthesis of 25-hydroxycholesterol and 25-hydroxycholecalciferol from animal bile starting materials in which hyodeoxycholic acid or an ester thereof is converted to the 3.beta.-hydroxy-5-cholenic acid alkyl ester, and this is converted to 3.beta.-hydroxy-25-cyano-5-cholene by a series of steps by which the sterol nucleus is stabilized by placing a protecting group at the 3 position and then extending the chain from the carbon at the 24 position to a cyanide group at the 25 position. The compound so formed is subjected to a series of reactions by which it is transformed into 25-hydroxy-7-dehydrocholesterol which may then be irradiated with ultraviolet light to 25-hydroxycholecalciferol. The invention discloses new and improved processes for preparing these end products and also new compounds formed as intermediates and processes for preparing these intermediates.
                            从动物胆汁起始材料合成25-羟基
胆固醇和25-羟基胆
钙化醇,其中脱氧
胆酸或其酯转化为3-β-羟基-5-胆烷烯酸烷酯,然后通过一系列步骤将其转化为3-β-羟基-25-
氰基-5-胆烷烯,通过在3位处放置保护基稳定甾体核,然后从24位处的碳延伸链到25位的
氰基来实现。所形成的化合物经过一系列反应,转化为25-羟基-7-脱氢
胆固醇,然后可以用紫外线照射成为25-羟基胆
钙化醇。该发明揭示了制备这些终端产品的新的改进工艺,以及形成的中间体化合物和制备这些中间体的工艺。