Rhodium-Catalyzed Asymmetric Conjugate Additions of Boronic Acids to Enones Using DIPHONANE: A Novel Chiral Bisphosphine Ligand
作者:Koen Vandyck、Bavo Matthys、Mario Willen、Koen Robeyns、Luc Van Meervelt、Johan Van der Eycken
DOI:10.1021/ol0522788
日期:2006.2.1
[reaction: see text] The synthesis of a novel enantiopure C2-symmetric bisphosphine, DIPHONANE, was accomplished starting from 2,5-norbornadione, utilizing (R,R)- and/or (S,S)-(2,3-O-di[(phenylamino)carbonyl]tartaric acid for the resolution of an intermediate phosphineoxide. The application of this ligand in the rhodium-catalyzed asymmetric conjugate addition of boronic acids to cyclic enones provides
[反应:参见正文]从2,5-降冰片二酮开始,利用(R,R)-和/或(S,S)-(2,3- O-二[((苯基氨基)羰基]酒石酸,用于拆分中间体氧化膦。这种配体在铑催化的硼酸与环烯酮的不对称共轭共轭加成中的应用提供了高产率的1,4-加成产物( 69-98%)和高ee's(78-95%ee),还观察到由连续的1,4-加成和1,2-加成产生的副产物。