The thermolysis of the 2-cyanoaziridines (1), 2-alkoxycarbonylaziridines (2), 2-arylaziridines (3), and 2, 2-dicyano-3-aryloxiranes (4) leads to a rupture of the carbon-carbon bond yielding an azomethine ylide and the ylide of a carbonyl. The reaction of these ylides of azomethine with methyl acetylene dicarboxylate (MADC) leads to the formation of a 3- pyroline, which is transformed, according to the substituants, to a 2-pyrroline or to pyrrole. ...
