One-Pot, Multistep Reactions for the Modular Synthesis of N,N′-Diarylindazol-3-ones

The pot-economic synthesis of N, N'-diarylindazol-3-ones has been developed using readily available isatoic anhydrides, aryl amines, and aryl boronic acids. A Cu-catalyzed oxidative C-N cross-coupling and dehydrogenative N-N formation sequence under an air atmosphere affords indazol-3-one derivatives in good to excellent yields. Such process merges well with the preceding decarboxylative amination reaction, resulting in a more modular and straightforward approach.