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

Autor: Kruglenko, V. P., Gnidets, V. P., Klyuev, N. A., Povstyanoi, M. V.
Zdroj: Chemistry of Heterocyclic Compounds; August 1989, Vol. 25 Issue: 8 p928-931, 4p
Abstrakt: 2-[(?-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.
Databáze: Supplemental Index
Externí odkaz: