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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(0) 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.
Tan et al. (Fri,) studied this question.
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