The rhodium­(III)-catalyzed C–H activation followed by intramolecular annulation reactions between arylhydrazines and iodonium ylides under suitable conditions has been described. Tetrahydrocarbazol-4-ones are readily achieved with moderate to excellent yields. The synthetic protocol features a wide range of substrates with high functional group tolerance. The gram-scale reaction and derivatization of the product demonstrate the synthetic practicality and utilization of this method.

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A Rh(III)-catalyzed C−H bond direct alkylation between 2-arylphthalazine-1,4-dione and α-Cl ketones, which is a sp3-carbon synthon, under mild conditions has been disclosed. Corresponding phthalazine derivatives are readily obtained in moderate...