Synthesis and Heteroannulation of 3,4-Dibenzoyl-1-phenyl-2a,5-diazabenz[cd]azulene

Abstract 3,4-Dibenzoyl-1-phenyl-2a,5-diazabenz[cd]azulene (2b) was synthesized by cycloaddition of 8-amino3-phenyl-1-azaazulene with dibenzoylacetylene. Heteroannulation to 2b has been achieved by reactions with hydrazine and phosphorus pentasulfide.