Asymmetric synthesis of tertiary vinyl carbinols by highly stereoselective methylation of α-methyl-β-ketosulfoxides with aluminum reagents
作者:José L Garcı́a Ruano、M Mercedes Rodrı́guez-Fernández、M.Carmen Maestro
DOI:10.1016/j.tet.2004.05.016
日期:2004.6
configuration at C-α. The stereochemical pathway seems to be different with both reagents, thus affording a higher stereoselectivity with Me2AlCl. Pyrolytic desulfinylation and hydrogenolysis of the C–S bond allowed the transformation of the resulting hydroxysulfoxides into interesting optically pure tertiary methyl carbinols.
报道了手性无环α-甲基-β-酮亚砜与Me 3 Al和Me 2 AlCl的甲基化。羟基碳上的诱导构型主要受亚磺酰基的构型控制,在大多数情况下,无论C-α上的构型如何,de均高于90%。两种试剂的立体化学途径似乎不同,因此对Me 2 AlCl具有更高的立体选择性。C–S键的热解脱亚甲基化和氢解作用使所生成的羟基亚砜转化为有趣的光学纯叔甲基甲醇。