Efficient and practical protocol for silylation of hydroxyl groups using reusable lithium perchlorate dispread in silica gel under neutral condition
作者:Najmedin Azizi、Rozbeh Yousefi、Mohammad R. Saidi
DOI:10.1016/j.jorganchem.2005.11.005
日期:2006.2
for the trimethylsilylation of a wide variety of alcohols, including primary, allylic, benzylic, secondary, hindered secondary, tertiary, and phenols with hexamethyldisilazane on the surface of silica gel dispersed with LiClO4 in room temperature at few minutes in excellent yields under neutral conditions is reported. This procedure also allows the excellent selectivity under LP-SiO2 system for silylation
在室温下几分钟内,用六甲基二硅氮烷在六氯二硅氮烷上分散含有LiClO 4的硅胶表面上的多种醇,包括伯,烯丙基,苄基,仲,受阻仲,叔和苯酚的三甲基甲硅烷基化反应,非常高效,温和据报道在中性条件下产量极高。该方法还允许在存在胺和酚羟基的情况下在LP-SiO 2系统下对醇进行甲硅烷基化具有优异的选择性。