New 2-alkylidenepseudoxazolones reacted with primary amines to give 1: 2-addition products of alkylidenepseudoxazolones and amines, while by the reaction with secondary amines, the mixtures of 1: 1-and 1: 2-adducts were isolated. A relationship of the structures of pseudoxazolones and amines to the products was discussed.
