2-alkoxycarbonyl, 2-cyano, 2-phenylsulfonyl N-alkylaziridines was elaborated via intramolecular nucleophiles substitution of chloride in 1-N-chloro-2-alkoxycarbonyl (cyano, phenylsulfonyl) ethyl amines. These substituted N-chloroamines are readily erasable via N-chlorination of the adducts of primary amines to Michael acceptors.