Abstract
2-[(Β-Ethyl-, arylimino)phenethyl]-1,2,4-triazino[2,3-a]benzimidazoles were obtained by reaction of 2-aroylmethyl-1,2,4-triazino[2,3-a]benzimidazol-4H-3-ones with ethyl(aryl)amines or urea. By the action of phosphorus oxychloride, these benzimidazoles cyclize into substituted pyrrolo[2,3-e]-1,2,4-triazino[2,3-a]benzimidazoles, heating of which in polyphosphoric acid leads to the formation of furo[2,3-e]-1,2,4-triazino[2,3-a]benzimidazoles, while by the action of P4S10, they are transformed into thieno[2,3-e]-1,2,4-triazino[2,3-a]benzimidazoles.
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For Communication 20, see [1].
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1109–1113, August, 1989.
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Kruglenko, V.P., Gnidets, V.P., Klyuev, N.A. et al. Condensed imidazo-1,2,4-azines. 21. Synthesis of 2-arylfuro(pyrrolo-, thieno-)[2,3-e]-1,2,4-triazino[2,3-a]benzimidazoles by cyclization of 2-aroyl-1,2,4-triazino[2,3-a]benzimidazol-4H-3-ones. Chem Heterocycl Compd 25, 928–931 (1989). https://doi.org/10.1007/BF00479615
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DOI: https://doi.org/10.1007/BF00479615