Experiments Directed Towards the Synthesis of Anthracyclinones. XVII. Cyclization Reactions of Some Anthraquinone Conduritol Acetals

Abstract

Lewis acid induced intramolecular cyclization reactions of cyclohexenyl acetals derived from the condensation of the conduritol dimethyl ether (2) with the anthraquinone aldehyde (3) have been shown to give naphthacenediones as the only tetracyclic products.