Synthesis of hydroxylated steroid hormones via conjugate addition of a silyl-cuprate reagent
作者:Diana Garside、David N. Kirk、Norman M. Waldron
DOI:10.1016/0039-128x(94)90102-3
日期:1994.12
several hydroxylated steroids via conjugate addition of Fleming's silyl-cuprate reagent, (PhMe2Si)2CuLi, a masked hydroxyl group, to the appropriate enone was studied. By this means 7 alpha-hydroxytestosterone (7) was obtained in good yield from 17 beta-hydroxyandrosta-4,6-dien-3-one (1a), though similar reactions on 17 beta-hydroxyandrosta-1,4-dien-3-one (8) gave a low yield of 1 alpha-hydroxytestosterone
研究了通过将Fleming的甲硅烷基-杯酸酯试剂(PhMe2Si)2CuLi,一种被掩蔽的羟基缀合到适当的烯酮中来合成几种羟基化的类固醇。通过这种方法,从17个β-羟基雄甾烯-4,6-dien-3-one(1a)以良好的收率获得了7个α-羟基睾丸激素(7),尽管对17个β-羟基雄甾烯-1,4-dien-3的反应相似-一(8)产生低产率的1α-羟基睾丸酮(13)的主要原因是苯基甲硅烷基中间体向卤代硅烷的转化率低。以类似的方式从3 beta-hydroxy-5 alpha-pregn-16-en-20-one和5 alpha-cholestane-1获得3 beta,16 alpha-Dihydroxy-5 alpha-pregnan-20-one(18b)。通过共轭加成甲硅烷基,还原羰基官能团,由1-en-3-one(14)生成alpha,3 alpha-diol(17),