Chiral 6,6′‐Bis(oxazolyl)‐1,1′‐biphenyls as Ligands for Copper(I)‐Catalyzed Asymmetric Cyclopropanation

Abstract A series of chiral bis(oxazoline)s with biphenyl backbones were synthesized from enantiomerically pure (S)‐ and (R)‐hexabenzyloxydiphenic acid (1) and their utility in copper(I)‐catalyzed asymmetric cyclopropanation was investigated. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)