Epoxidation and reduction of cholesterol, 1,4,6-cholestatrien-3-one and 4,6-cholestadien-3β-ol
作者:Eunsook Ma、Haksoon Kim、Eunjeong Kim
DOI:10.1016/j.steroids.2004.11.003
日期:2005.4
Many naturally occurring polyhydroxylated sterols and oxysterols exhibit potent biologic activities. This paper describes reagent and position selectivity of epoxidation and reduction of cholesterol derivatives. Cholesterol was reacted with m-chloroperoxybenzoic acid (m-CPBA) to form 5alpha,6alpha-epoxycholestan-3beta-ol, but in reaction with 30% H(2)O(2), it did not reacted. 1,4,6-cholestatrien-3-one
许多天然存在的多羟基固醇和氧固醇具有强大的生物活性。本文介绍了环氧化和胆固醇衍生物还原的试剂和位置选择性。胆固醇与间氯过氧苯甲酸(m-CPBA)反应形成5alpha,6alpha-epoxycholestan-3beta-ol,但与30%H(2)O(2)反应时,它没有反应。从胆固醇和2,3-二氯-5,6-二氰基-1,4-苯醌在二恶烷中获得1,4,6-胆甾烯三烯-3-酮。1,4,6-cholestatrien-3-one与30%H(2)O(2)和5%NaOH的甲醇溶液反应生成1alpha,2alpha-epoxy-4,6-cholestadien-3-one用NaBH(4)进行立体选择性还原,形成1alpha,2alpha-环氧-4,6-胆甾二烯3beta-ol,并在无水乙醇中用锂金属还原,得到2-乙氧基-1,4,6-胆甾烯三-3-。1,4 用m-CPBA在二氯甲烷中将6-胆甾烯三烯3-1环