Studies on Heterocyclic Analogs of Azulene. VIII. Reaction of 2-Alkoxycyclohepta[6]pyrroles with Dimethyl Acetylenedicarboxylate

Abstract
2-Alkoxycyclohepta[b] pyrroles reacted with dimethyl acetylenedicarboxylate to give tetramethyl 2-alkoxy-3H-2a-azacyclopenta[ef]heptalene-3,4,5,6-tetracarboxylates in benzene and dialkyl 2-(2-alkoxycyclohepta[b]pyrrol-1-yl)fumarate in alcoholic solvents