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摘要
A new and efficient cascade synthesis of indazolo[2,1-a]indazole-6,12-diones has been developed. This protocol includes an intermolecular N-acylation followed by a copper-catalyzed intramolecular C-N coupling reaction. The methodology is applied to a wide range of 2-bromo and 2-chloro benzoyl chlorides to yield the indazolo[2,1-a]indazole-6,12-diones in good to excellent yields with high regioselectivities.
