ON THE REACTION OF N-VINYLIMINOPHOSPHORANES. A NOVEL ROUTE TO 1-AZAAZULENE RING SYSTEM UTILIZING AZA-WITTIG REACTION

Abstract
N-(1-Phenyl)vinyliminotriphenylphosphorane, conveniently prepared from α-azidostyrene and triphenylphosphine, readily undergoes an annelation reaction with tropone derivatives to result in the formation of 1-azaazulene ring system.