Aminimines derived in situ from a number of enantiomerically pure binaphthalene-based tertiary amines have been used for the asymmetric aziridination of chalcone, providing N-unprotected aziridines with ee values of up to 43%. A chiral hydrazinium salt has been isolated for the first time and shown to provide similar yield and enantioselectivity to the in situ process in reaction with chalcone.

A number of stable new N‐H oxaziridines have been designed and prepared, and their reactivity as electrophilic sources of nitrogen investigated. 3‐tert‐Butyl‐3‐phenyloxaziridine is the most efficient and stable and has potential for use as a general reagent for this purpose.

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