Electrophilic Epoxidation of α,β-Unsaturated Oximes with Dioxiranes and Ring Opening of the Epoxides

Abstract

-Unsaturated oximes underwent electrophilic epoxidation with in-situ-generated dimethyldioxirane to give the corresponding epoxides in good yields. This reaction is an example of "carbonyl umpolung" by transformation of -unsaturated ketones to their oximes. Nucleophilic ring-opening reactions of the epoxides afforded -substituted products. Shi asymmetric epoxidation of the oximes proceeded with moderate asymmetric selectivity.