IBiox[(-)-menthyl]: a sterically demanding chiral NHC ligand

J Am Chem Soc. 2009 Jun 24;131(24):8344-5. doi: 10.1021/ja901018g.

Abstract

An exceedingly sterically demanding, rigid, and chiral NHC ligand, IBiox[(-)-menthyl] (1), was prepared and structurally characterized. With a buried volume of approximately 50%, this ligand arguably represents one of the most sterically demanding monodentate ligands. The ability to use aryl chloride substrates in intramolecular palladium-catalyzed alpha-arylations reveals its unique reactivity. Moreover, C(2)-symmetric 1 allows the highly enantioselective formation of oxindoles with up to 99% ee.