Methylene Components Exchange in the Reaction of Cyanoacetohydrazide with 2-Amino-4-arylbuta-1,3-diene-1,1,3-tricarbonitriles

Abstract

2-Amino-4-arylbuta-1,3-diene-1,1,3-tricarbonitriles obtained by Knoevenagel condensation between aldehydes and malononitrile dimer reacted with cyanoacetohydrazide in the presence of bases to afford N'-arylidene-2-cyanoacethydrazides instead of the expected heterocyclization products of the pyridine series.