REACTION OF 1-AMINOBENZIMIDAZOLES WITH β-DIKETONES. SYNTHESIS OF PYRIDAZINOBENZIMIDAZOLES

Article abstract of DOI:10.1007/BF00513269

The action of acetyl- and benzoylacetone on 1-aminobenzimidazoles in the presence of catalytic amounts of zinc chloride was used to synthesize 1-ylidene derivatives, which at higher temperatures undergo thermal cyclization to 2,4-disubstituted pyridazino<1,6-a>benzimidazoles.