(5-(1H-benzo [d] imidazol-2-yl)-1H-pyrrol-3-yl)(6-hydroxy-4, 7-dimethoxybenzofuran-5-yl) methanone (4) and 3-(6-hydroxy-4, 7-dimethoxybenzofuran-5-carbonyl)-6H-pyrimido [1, 6-a] pyrimidine-6, 8 (7H)-dione (5) were synthesized by the reaction of 4, 7-dimethoxy-5-oxo-5H- furo [3, 2-g] chromene-6-carbaldehyde (1) with (1H-benzo [d] imidazol-2-yl) methanamine dihydrochloride and 4-amino-2, 6-dihydroxypyrimidine, respectively, via ROR in the ...