New Pd-catalyzed tandem cyclization processes on group 6 bis-carbene complexes

Abstract

The reaction of bis-carbene complexes 1a,b derived from catechol and Pd-catalysts gave product 3 derived from an intramolecular coupling–electrocyclization process, while nucleophilic attack–NH-carbene insertion product 6 was obtained from complexes 1c,d derived from 1,2-diaminobenzene.