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Metal-Free, Acid-Catalyzed ortho-Directed Synthesis of Anthranilic Acid Derivatives Using Carbodiimides.

One-pot syntheses of fluorescent o-aminobenzoates, o-aminopyridine carboxylates, and a 2'-amino-[1,1'-biphenyl]-2-carboxylic acid are described. Carbodiimides are used as the source of the 2-amino function which inserts onto an aromatic ring using S(N)Ar reaction conditions. This method proceeds regiospecifically with a range of 2-fluoroaromatic acids or esters bearing further aryl fluorine, trifluoromethyl, and cyano substituents.