Copper-Catalyzed Three-Component Formal [3 + 1 + 2] Benzannulation for Carbazole and Indole Synthesis

Three-component formal [3 + 1 + 2] benzannulation reactions of indole-3-carbaldehydes or 1-methyl-pyrrole-2-carbaldehydes with two different molecules of saturated ketones have been successfully developed under Cu-catalyzed and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated conditions. Variou...

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Published in:Journal of organic chemistry 2020-07, Vol.85 (14), p.9117-9128
Main Authors: Guo, Tenglong, Han, Li, Wang, Tingpeng, Lei, Lan, Zhang, Jian, Xu, Dezhu
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cited_by cdi_FETCH-LOGICAL-a310t-7443a7818ee2f9675d24bf85f211a83413ae9b44282f8b6d0f11fcb91b9a3ba23
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container_end_page 9128
container_issue 14
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container_title Journal of organic chemistry
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creator Guo, Tenglong
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description Three-component formal [3 + 1 + 2] benzannulation reactions of indole-3-carbaldehydes or 1-methyl-pyrrole-2-carbaldehydes with two different molecules of saturated ketones have been successfully developed under Cu-catalyzed and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated conditions. Various unsymmetrically substituted carbazoles and indoles were obtained up to 95% yield. Furthermore, the resulting products exhibit unusual aggregation-induced emission (AIE) properties in the solid state. This method features high atom-economy, cheap catalysts and oxidants, wide substrate scope, and saturated ketones as one-carbon and two-carbon sources, thus providing an efficient approach to polycyclic carbazole and indole compounds.
doi_str_mv 10.1021/acs.joc.0c01056
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title Copper-Catalyzed Three-Component Formal [3 + 1 + 2] Benzannulation for Carbazole and Indole Synthesis
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