Simple Branched Sulfur–Olefins as Chiral Ligands for Rh-Catalyzed Asymmetric Arylation of Cyclic Ketimines: Highly Enantioselective Construction of Tetrasubstituted Carbon Stereocenters
作者:Hui Wang、Tao Jiang、Ming-Hua Xu
DOI:10.1021/ja3110818
日期:2013.1.23
New, simple, sulfinamide-based branched olefin ligands have been developed and successfully used in Rh-catalyzed asymmetric arylations of cyclic ketimines, providing efficient and highly enantioselective access to valuable benzosultams and benzosulfamidates containing a stereogenic quaternary carbon center. This is the first example of applying a sulfur-olefin ligand in catalytic asymmetric addition
A Palladium-Catalyzed Enantioselective Addition of Arylboronic Acids to Cyclic Ketimines
作者:Guoqiang Yang、Wanbin Zhang
DOI:10.1002/anie.201302861
日期:2013.7.15
Nicox: A palladium‐catalyzed addition of arylboronicacids to ketimines has been developed to efficiently provide products in up to 99 % yield and 96 % ee. The reactions could be run under aerobic conditions and with unpurified trifluoroethanol (TFE). A pyrrolidine compound bearing a chiral α‐tertiary amine was synthesized in several steps without loss of enantioselectivity. TFA=trifluoroacetate.