Preparation of (25)- and (25)-26-functionalized steroids as tools for biosynthetic studies of cholic acids
作者:V KHRIPACH、V ZHABINSKII、O KONSTANTINOVA、N KHRIPACH、A ANTONCHICK、A ANTONCHICK、B SCHNEIDER
DOI:10.1016/j.steroids.2005.02.014
日期:2005.7
new synthesis of both epimeric forms of 26-cholestanoic acids and 26-alcohols containing a 3beta-hydroxy-Delta(5)- or a Delta(4)-3-keto-functionality in ring A is described starting from stigmasterol or (20S)-3beta-acetoxy-pregn-5-en-20-carboxylic acid. The obtained compounds are useful as standards for studies of cholic acids. Construction of the side chain was achieved by linkage of steroidal 23-iodides
从豆甾醇或 (20S) 开始,描述了在环 A 中含有 3β-羟基-Delta(5)-或 Delta(4)-3-酮基官能团的 26-胆甾烷酸和 26-醇的差向异构形式的新合成)-3β-乙酰氧基-pregn-5-en-20-羧酸。所得化合物可用作研究胆酸的标准品。侧链的构建是通过将甾体 23-碘化物连接到由 (2R)- 和 (2S)-3-羟基-2-甲基丙酸酯制备的砜来实现的。使用由 TEMPO 和漂白剂催化的亚氯酸钠,将中间体 26-醇氧化成相应的羧酸,确保保留 C-25 的立体化学和环状部分的官能团。