摘要:
                                Atropos phosphoramidites with the D-2-symmetric biphenyl backbone were diastereoselectively prepared with ease from achiral tetrahydroxy biphenyls. This type of ligands is proved to be highly efficient in the Cu-catalyzed conjugate additions of diethylzinc to alpha,beta-unsaturated ketones and nitroalkenes. The unique D-2-symmetric backbone endows the ligands with an excellent chiral environment. (C) 2010 Elsevier Ltd. All rights reserved.