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Facile synthesis of indole- or benzofuran-fused benzo[a]carbazole-1,4-diones using a tandem two-step reaction sequence

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Abstract

An efficient three-step approach was developed to assemble indole- or benzofuran-fused benzocarbazole-1,4-diones in 42–53% overall yield. This approach includes AgOAc-promoted oxidative cyclization of 2,6-di-bromocyclohexene-1,4-dione with indol-3-ylpropanoid acid, condensation of the resulting bromocarbazole intermediates with phenols or anilines, followed by Pd(OAc)-catalyzed cyclization. Such convenient synthetic protocol and the novelty of the corresponding products will largely assist our drug design and development program.

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Correspondence to Ao Zhang.

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Part of this study has been presented in the 2nd International Symposium on Combinatorial Sciences in Biology, Chemistry, Catalysts and Materials in Beijing on September 19–23, 2009.

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Tu, S., Ding, C., Hu, W. et al. Facile synthesis of indole- or benzofuran-fused benzo[a]carbazole-1,4-diones using a tandem two-step reaction sequence. Mol Divers 15, 91–99 (2011). https://doi.org/10.1007/s11030-010-9241-x

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