Bis(aminoalkyl)cyclopropenylidene (BAC)-Catalyzed Intramolecular Annulation of 2-(2-Formylaryl)-aryl-Substituted -Quinone Methides to 9-Phenanthrol Derivatives.

This article describes a bis(aminoalkyl)cyclopropenylidene (BAC)-catalyzed intramolecular annulation of strategically designed 2-(2-formylaryl)-phenyl-substituted -quinone methides (QMs) to access 9-phenanthrol derivatives and related carbocycles. In addition, the synthetic utility of this methodology has been demonstrated in the synthesis of the seven-membered carbocyclic core of resveratrol-based natural products (±)-shoreaphenol and (±)-malibatol A.