Preparative Method for the Quantitative Separation of Methylenic Sterols from Unsaturated Sterol Mixtures by Chemoselective Hydroxymercuration-Deoxymercuration
作者:Laïla El Kihel、Georges Charles
DOI:10.1055/s-2006-942495
日期:2006.8
intermediates were easily purified by flash chromatography on silica gel column and the reactive alkenes were regenerated by deoxymercuration in a biphasic system (ethyl acetate/I M HCl, 2:1 ratio). These conditions leave the ring double bonds of steroids intact. No isomerization of methylene double bonds was observed.
报道了一种前所未有的选择性和定量方法,允许从不饱和甾醇混合物中分离亚甲基甾醇。我们已将改良布朗条件下的羟基汞化反应扩展到对三十种不饱和甾醇作为各种甾醇混合物的系统研究。在甾醇的亚甲基侧链上实现了高产的定向化学选择性羟基汞化。得到的有机汞中间体很容易通过硅胶柱上的快速色谱法纯化,反应性烯烃通过在双相系统(乙酸乙酯/1M HCl,2:1比例)中脱氧汞再生。这些条件使类固醇的环双键完好无损。没有观察到亚甲基双键的异构化。