The structural modification of phthalazinones and indazolones has emerged as a pivotal topic in the catalytic C–H functionalization event. Herein we report the hydrazide-assisted rhodium(III)-catalyzed cross-coupling reactions of N-aryl phthalazinones and N-aryl indazolones with vinylene carbonate. This method provides direct access to tetracyclic hydroxycinnolines. Complete site-selectivity and functional group compatibility were observed.
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