An iodine-catalyzed methyl azaarene sp C-H functionalization has been developed for the synthesis of a seven-membered -heterocyclic architecture containing three different heterocyclic aromatic hydrocarbons. This method can be applied to a wide range of substituted methyl azaarenes and diverse 2,4-dihydro-3-pyrazol-3-ones, and brings about the efficient preparation of 2,9-dihydrooxepino[2,3-:6,5-']dipyrazol-3(7)-ones in high yields with the merits of low catalyst loading, good functional group tolerance and metal-free conditions.
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