First planar chiral bidentate ligand based on a (η~5-cyclopentadienyl)(η~4-cyclobutadiene) cobalt backbone: high efficiency in enantioselective palladium-catalyzed allylic substitutions

摘要

The synthesis of the planar chiral (R)-[η~5-(1-diphenylphosphino-2-tert-butylsulfenyl)cyclopentadienyl](η~4-tetraphenylcyclobutadiene) cobalt and its high efficiency as P,S-bidentate ligand in Pd-catalyzed allylic substitutions is described.