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- W2973709237 abstract "Abstract NH 4 I promoted three‐component reaction of indoles, cyclic ketones and maleimides in toluene at 140 °C afforded polysubstituted cyclic fused pyrrolo[3,4‐ a ]carbazoles in good yields. The reaction mechanism included sequential Lewis acid catalyzed 3‐alkenylation of indole, Diels‐Alder reaction and aromatization process. More importantly, the similar NH 4 I promoted reaction of indoles and acetophenones with two molecules of maleimides in refluxing toluene resulted in the complex tetrahydro‐4,10 a ‐[3,4]epipyrrolopyrrolo[3,4‐ a ]carbazoles in satisfactory yields via double Diels‐Alder reaction. On the other hand, tetrahydropyrrolo[3,4‐ a ]carbazoles can be easily prepared in high yields by conc. HCl catalyzed three‐component reaction of indole and acetophenone and one molecules of maleimide in refluxing ethanol." @default.
- W2973709237 created "2019-09-26" @default.
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- W2973709237 date "2019-09-19" @default.
- W2973709237 modified "2023-09-26" @default.
- W2973709237 title "Efficient Synthesis of Fused and Bridged Cyclic Pyrrolo[3,4‐a]carbazoles via NH <sub>4</sub> I Promoted Three‐component Reaction" @default.
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- W2973709237 doi "https://doi.org/10.1002/slct.201902407" @default.
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