Asymmetric induction and configurational correlations in oxidations at sulphur. Part V. Oxidations of optically active esters of o-(methylthio)benzoic acid by achiral peroxy-acids
作者:G. Barbieri、V. Davoli、I. Moretti、F. Montanari、G. Torre
DOI:10.1039/j39690000731
日期:——
of optically active esters of o-(methylthio)benzoic acid with achiral peroxy-acids (perbenzoic and 2,4,6-trimethylperbenzoic acids) yields mixtures of the corresponding diastereomeric sulphoxides, enriched in one of the components. Hydrolysis affords optically active o-methylsulphinylbenzoic acid. The absolute chirality of the latter depends on the chirality of the inducing alcohol. The optical yields
邻-(甲硫基)苯甲酸的光学活性酯与非手性过氧酸(过苯甲酸和2,4,6-三甲基过苯甲酸)的氧化产生相应的非对映亚砜的混合物,其富含一种组分。水解得到旋光的邻甲基亚磺酰基苯甲酸。后者的绝对手性取决于诱导醇的手性。体积较大的三甲基过苯甲酸的光学收率明显更高。不对称感应是根据小,中和大群体的食相效应来解释的。提出了一个基于非对映体过渡态构象的相关模型,该构象表现出最大的空间压缩差异。