An Enantioselective Bidentate Auxiliary Directed Palladium-Catalyzed Benzylic C−H Arylation of Amines Using a BINOL Phosphate Ligand
作者:Hao Wang、Hua-Rong Tong、Gang He、Gong Chen
DOI:10.1002/anie.201609337
日期:2016.12.5
A new enantioselective palladium(II)‐catalyzed benzylic C−H arylation reaction of amines is enabled by the bidentate picolinamide (PA) directing group. This reaction provides the first example of enantioselective benzylic γ‐C−H arylations of alkyl amines, and proceeds with up to 97 % ee. The 2,2′‐dihydroxy‐1,1′‐binaphthyl (BINOL) phosphoric acid ligand, Cs2CO3, and solvent‐free conditions are essential
二齿吡啶甲酰胺(PA)导向基团可实现新的对映选择性钯(II)催化的胺的苄基CH芳基化反应。该反应提供了烷基胺对映选择性苄基γ-C-H芳基化的第一个实例,并以高达97%的ee进行。2,2'-二羟基-1,1'-联萘(BINOL)磷酸配体Cs 2 CO 3和无溶剂条件对于高对映选择性至关重要。机理研究表明,多个BINOL配体参与立体确定CH palpalation步骤。