Sodium enolates of ketones react with 1-acyl-, 1-aminocarbonyl-, and 1-alkoxycarbonylaziridines to give γ-amidoketones ([N-(4-oxoalkyl)-carboxamides, -ureas, and -carbamic esters]. Twofold amidoethylation in α,α- or α,α′-position can usually be suppressed by using excess enolate, exept for the amidoethylation of 1-indanone.