Optimized Synthetic Route for Enantioselective Preparation of (<i>S</i>)-Metolachlor from Commercially Available (<i>R</i>)-Propylene Oxide
作者:Peng Yang、Xiao Wang、Lin Peng、Feng Chen、Fang Tian、Chao-Zhe Tang、Li-Xin Wang
DOI:10.1021/acs.oprd.7b00216
日期:2017.10.20
An enantioselective preparation of (S)-metolachlor has been accomplished. The synthetic route featured the asymmetric preparation of chiral intermediates and the final (S)-metolachlor from commercially available (R)-propylene oxide and a key Fukuyama’s process. The key steps, control points, separation purifications, and the whole process are optimized, and the target compound has been successfully
(S)甲草胺的对映选择性制备已完成。合成路线的特征是手性中间体的不对称制备和市售的最终(S)-甲虫草胺(R)-环氧丙烷和福山的关键工艺。对关键步骤,控制点,分离纯化和整个过程进行了优化,目标化合物已分五步成功制备,总收率在51%至55%之间,对映体选择性(99%ee)高达30 g。通过明智地选择合成途径以及选择起始原料和中间体,不需要柱色谱法来分离和纯化中间体和最终产物。扩展了相同的策略,将其作为甲霜灵-M和二甲胺磷-P的一系列农药和除草剂类似物的通用方法。