Organocatalytic Stereoselective Aziridination of Imines via Ammonium Ylides

Tertiary amine catalyzed reaction of imines with phenacyl bromide derivatives expeditiously affords functionalized aziridines in high yields and stereoselectivities in a one-pot process. Advantageously, the protocol precludes the preparation and isolation of ylides and their precursors in a separate step as they are formed ill situ.