CYCLOCONDENSATIONS OF CHALCONES WITH 2-AMINO- AND 1,2-DIAMINOBENZIMIDAZOLES

Article abstract of DOI:10.1007/BF00479608

2,4-Diaryl-1,4-dihydropyrimido<1,2-a>benzimidazoles were obtained by the reaction of 2-aminobenzimidazole with chalcones, and their heteroaromatization was accomplished.The condensation of 1,2-diaminobenzimidazole with unsymmetrically substituted chalcones, which leads to substituted pyrimido<1,2-a>benzimidazoles, was studied.The specificity of this reaction was ascertained by means of alternative synthesis.