Described herein is the iridium-catalyzed sequential C(2)-arylation reaction and intramolecular C–O bond formation from azulenecarboxylic acids and diaryliodonium salts, leading to the formation of 3-arylazulenofuranones. The sequential reaction proceeded smoothly through generation of 2-arylazulene-1-carboxylic acids derived from the iridium-catalyzed regioselective C(2)-arylation reaction without the decarboxylation reaction.

An iridium(III)-catalyzed regioselective acylmethylation of the cage B(4)−H bond in o-carborane acids with sulfoxonium ylides is demonstrated through B(4)−H activation in ethanol under very mild conditions, affording a number of B(4)acylmethylated o-carboranes. Additionally, the selective sequential B(4)-and B(6)-acylmethylation reactions finally gave B(3,5)diacylmethylated o-carboranes in one pot.

An efficient synthetic method for structurally various isochromenoindolones has been demonstrated through Rh(III)‐catalyzed C−H activation followed by a cyclization reaction of N‐methoxyarylamides with 3‐diazooxindoles. The sequential reaction involves the streamlined formation of C−C and C−O bonds in one pot. The present method provides a broad range of isochromenoindolones as a new privileged scaffold in moderate to good yields with the release of methoxyamine and molecular nitrogen and has the benefits of a broad substrate scope and good functional group tolerance.