Solvent-modulated chemoselective deprotections of trialkylsilyl esters and chemoselective esterifications
作者:Adam Shih-Yuan Lee、Feng-Yih Su
DOI:10.1016/j.tetlet.2005.07.049
日期:2005.9
A series of trialkylsilyl esters were deprotected or transesterificated into their corresponding carboxylic acids or methyl esters under a catalytic amount of CBr4 in alcohol reaction system. This method enables to desilylate secondary sp3-carbon, sp2-carbon, sp-carbon and aryl tethered trialkylsilyl esters to carboxylic acids, whereas primary sp3-carbon tethered trialkylsilyl esters were further converted
在醇反应体系中,在催化量的CBr 4下,将一系列的三烷基甲硅烷基酯脱保护或酯交换成它们相应的羧酸或甲酯。该方法使得能够将仲sp 3-碳,sp 2-碳,sp-碳和芳基系链的三烷基甲硅烷基酯脱甲硅烷基化为羧酸,而将sp 3-碳系链的三烷基甲硅烷基酯进一步在CBr 4 / MeOH反应下转化为它们的甲酯。情况。在这种光化学诱导的反应条件下,可以通过引入的保护三烷基甲硅烷基和所用的醇如MeOH和EtOH来调节和实现高度化学选择性的脱保护。