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。