Abstract
Consecutive Knoevenagel condensation, Michael addition, cyclization, and Ullmann Csp2-N coupling reactions took place in the Domino reaction of o-halogenated benzaldehydes, tert-butyl 2,4-dioxopiperidine-1-carboxylate, and 1H-indazol-6-amine or 3H-benzo[d]imidazol-5-amine catalyzed by CuI. It gave series of fused hexacyclic heterocycles containing naphthyridine, acridine, and pyrazole (imidazole) moieties in one-pot under ligand-free conditions.
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We are grateful to the Major Natural Science Foundation of Jiangsu Province (14KJA150004) and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions for financial support.
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Ma, YG., Qiang, WW., Li, C. et al. Copper-catalyzed Ullmann reaction for the synthesis of fused hexacyclic heterocycles containing naphthyridine, acridine, and pyrazole (imidazole) moieties. Monatsh Chem 147, 1233–1242 (2016). https://doi.org/10.1007/s00706-015-1625-2
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DOI: https://doi.org/10.1007/s00706-015-1625-2