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

Chem Commun (Camb). 2002 Sep 7:(17):1842-3. doi: 10.1039/b204907d.

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.