Oxidative Nucleophilic Substitution of Hydrogen in Nitroarenes with Carbanions of Protected Serine and Threonine Esters
作者:Daniel Sulikowski、Mieczysław Mąkosza
DOI:10.1002/ejoc.201000498
日期:2010.8
serine and threonine esters with nitroarenes were studied. The main process involves the addition of the carbanions to the para position of the nitroarenes, which is occupied by a hydrogen atom, to form σ H adducts that are subsequently oxidized by 2,3-dichloro-5,6-dicyanobenzoquinone to give p-nitroaryl derivatives of the protected serine and threonine. Oxidation of the σ H adducts with dimethyldioxirane
研究了受保护的丝氨酸和苏氨酸酯的碳负离子与硝基芳烃的反应。主要过程包括将碳负离子添加到被氢原子占据的硝基芳烃的对位,形成 σ H 加合物,随后被 2,3-二氯-5,6-二氰基苯醌氧化生成对-受保护的丝氨酸和苏氨酸的硝基芳基衍生物。σ H 加合物与二甲基二环氧乙烷的氧化导致这些氨基酸相应对羟基芳基衍生物的形成。受保护的苏氨酸酯的碳负离子的加成是一个高度立体选择性的过程,由苏氨酸的第二手性中心控制。