An efficient method for synthesis of anthranilic acids by Pd-catalyzed ortho-C-H amidation of benzoic acids is disclosed. The amidation is proposed to proceed by carboxylate-assisted ortho-C-H palladation to form an arylpalladium(II) complex, followed by nitrene insertion to the Pd-C bond.
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Ng et al. (2012) studied this question.
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