Synthesis of Tetra- and Pentaaza Heterocyclic Systems and Benzimidazo[1,2-c]quinazoline Derivatives

摘要

5,6-Dihydropyrimido[5',4':5,6]pyrido[1,2-a]benzimidazole and pyrimido[4',5':4,5]pyrimido[1,6-o]-benzimidazole derivatives were synthesized starting from 3-[4-hydroxy-6-methyl(hydroxy)-2-phenylpyrimidm-5-yl]propanoic and 4-hydroxy-2-phenylpyrirnidine-5-carboxylic acids. New 6-sulfanyl-substituted benzimidazo-[1,2-c]quinazolines were also prepared.