1-Tetrazolyl-substituted tetrahydro-β-carbolines undergo a reaction with activated alkynes (acetylacetylene, methyl propiolate, and dimethyl acetylenedicarboxylate) over 4–8 days in MeOH or 1 day in CF3CH2OH with the formation of multicomponent mixtures, from which spiro[indole-3,4'-pyridines] were isolated chromatographically. Additionally, two azocino[5,4-b]indoles were isolated from methyl propiolate and acetylacetylene reactions.
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The publication was financially supported by the Ministry of Education and Science of the Russian Federation (Agreement № 02.A03.21.0008), the Russian Foundation for Basic Research (grants 15-33-20187, 16-53-540004, 17-53-540001), and Vietnam (VAST.HTQT.NGA.06/16-17).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2017, 53(5), 575–581
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Vosskresensky, L.G., Titov, A.A., Samavati, R. et al. Synthesis of 1-tetrazolyl-substituted 2,3,4,9-tetrahydro-1H-β-carbolines and their transformations involving activated alkynes. Chem Heterocycl Comp 53, 575–581 (2017). https://doi.org/10.1007/s10593-017-2094-9
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DOI: https://doi.org/10.1007/s10593-017-2094-9