SYNTHESE POLYCYCLISCHER [C]-ANELLIERTER THIOPHENE

Abstract

A benzene ring substituted with two acyl groups in ortho-position was built from α-dicarbonyl compounds and dibenzyl ketone via Diels-Alder reaction of the intermediate cyclopentadienones with 1,2-diaroyl acetylenes and subsequent decarbonylation. The polycycles which were synthesized in this way formed interesting new c]-annellated thiophenes on reaction with tetraphosphorus decasulfide (P₄S₁₀).