Synthesis of enantiomerically pure (R)- and (S)-2-ethoxycarbonylmethyl-2-hydroxy-cyclohexanones
作者:José L Garcı́a Ruano、David Barros、M.Carmen Maestro、Ana Alcudia、Inmaculada Fernández
DOI:10.1016/s0957-4166(98)00367-x
日期:1998.10
with thiosulfonates. The in situ aldol reaction of these compounds with ethyl acetate enolate is highly stereoselective (1,2-asymmetric induction) and yields diastereomeric mixtures of β-hydroxyesters (the configuration of the major one being dependent on the sulfenylating agent) that can be readily separated and transformed into the enantiomerically pure title ketones.
2-对甲苯基亚磺酰基环己酮的亚磺酰基化可以在-78°C下用硫代磺酸盐实现。这些化合物与乙酸乙酯的烯醇盐的原位羟醛反应是高度立体选择性的(1,2-不对称诱导),可生成易于分离的β-羟基酯的非对映混合物(主要的构型取决于亚磺酰化剂)。并转化为对映体纯的标题酮。