Condensed imidazo-1,2,4-azines. 13. Reaction of 1,2-diaminobenzimidazole with 3-benzoyl-2-propanonic acids

Refluxing 1,2-diaminobenzimidazole with 3-benzoyl-2-propanonic acids in methanol gives the corresponding salts, viz., 1,2-diaminobenzimidazole 3-benzoyl-2-propanonates, which are converted to 2-benzoylmethyl-1,2,4-triazino[2,3-]-benzimidazol-4H-3-ones upon heating in high-boiling organic solvents.See [1] for communication 12.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1402–1405, October, 1985.