with the anhydride or the lactone, (γbenzylidene-y-butyrolactone), of 4-oxo-5-phenylpentanoic acid or with its amides, and with aangelicalactone and 4-oxopentanoic acid amides, resulted to the corresponding 2-aminopyrrolidin-5ones, the cyclic tautomers of the Schiff bases of γ-keto amides.