Asymmetric oxaziridination catalyzed by cinchona alkaloid derivatives containing sulfide

A new method has been developed for the asymmetric oxaziridination of aryl aldimines with m-chloroperbenzoic acid, involving the use of cinchona alkaloid derivatives containing a sulfide moiety as a catalyst. The new method provided access to optically active oxaziridines in good yields with high enantiomeric excess (ee) values of up to 95%.