Ruthenium‐Catalyzed Regioselective Direct Ortho‐Acyloxylation of Azoarenes with Carboxylic Acids via C–H Bond Activation

A Ru II ‐catalyzed highly regioselective C–H acyloxylation of azoarenes with inexpensive alkyl and aryl carboxylic acids as an acyloxylation agent is described. The reaction demonstrates a broad substrate scope and good functional group tolerance. This method provides a facile procedure to synthesize ortho ‐acyloxylated azoarene derivatives.