Intermolecular cobalt-mediated [2 + 2 + 2]cycloadditions : regiospecific one-step construction of bicyclic dienes from α,ω-enynes and alkynes
Abstract
α,ω-Enynes are co-cyclised with alkynes and stoicheiometric amounts of dicarbonyl(cyclopentadienyl) cobalt to furnish bicyclic-diene cobalt complexes and their free ligands regiospecifically, the former being convertible into the latter by oxidative demetallation.