A novel C2-symmetric bisphosphane ligand with a chiral cyclopropane backbone: synthesis and application in the Rh(I)-catalyzed asymmetric 1,4-addition of arylboronic acids
作者:Yaşar Gök、Timothy Noël、Johan Van der Eycken
DOI:10.1016/j.tetasy.2010.10.027
日期:2010.12
The synthesis of a novel C-2-symmetric bisphosphane ligand was accomplished starting from trans(2R,3R)-bis(3',5'-diphenylphenyl)cyclopropane-1,1-dimethanol as a key intermediate. This ligand was tested in the asymmetric rhodium(I)-catalyzed 1,4-addition to cyclic enones. We also compared the new ligand with a similar phosphane ligand with a less bulky cyclopropane backbone. Good yields (up to 99%) and enantioselectivities (up to 89% ee) were observed. We demonstrated that the presence of a more bulky cyclopropane backbone resulted in a less effective ligand. (C) 2010 Elsevier Ltd. All rights reserved.