Enantioselective oxidation of β-hydroxythioethers. Synthesis of optically active alcohols and epoxides
作者:V. Conte、F. Di Furia、G. Licini、G. Modena、G. Sbampato、G. Valle
DOI:10.1016/s0957-4166(00)80048-8
日期:1991.1
using S-methyl derivatives. Examples referring to the oxidation of various S-methyl-β-hydroxythioethers, characterized by e.e. values up to 80%, which may be further increased (⪢98%) by crystallization, are presented. Results concerning the synthesis of optically active epoxides and alcohols starting from β-hydroxysulfoxides are also presented which, in some cases, allows the absolute configuration of the
光学纯的β-羟基亚砜可通过用我们实验室开发的改性Sharpless试剂直接氧化母体硫醚获得。成功进行不对称氧化的必要条件是保护OH功能以及与硫醚硫连接的两个基团的最大尺寸差异。通过使用S-甲基衍生物可以满足后一种条件。涉及各种S氧化的例子提出了特征为ee值高达80%的-甲基-β-羟基硫醚,通过结晶可进一步提高(⪢98%)。还给出了关于从β-羟基亚砜开始合成旋光性环氧化物和醇的结果,在某些情况下,可以建立母体亚砜的绝对构型。