Journal of the American Chemical Society, Vol.132, No.11, 3676-3676, 2010
Palladium-Catalyzed Amination of Aromatic C-H Bonds with Oxime Esters
We report a Conceptually new approach to the direct amination of aromatic C-H bonds. In this process, an oxime ester function reacts with an aromatic C-H bond under redox-neutral conditions to Form, in the case Studied, an indole product. These reactions Occur with relatively low catalyst loading (1 mol %) by a mechanism that appears to involve an unusual initial oxidative addition of an N-O bond to a Pd(O) species. The Pd(II) complex from oxidative addition of the N-X bond has been isolated for the first time, and evidence for the intermediacy of such oxidative addition products in the catalytic reaction has been gained.