Abstract Two dihydroxybenzofuroquinolinones, 3, 9-dihydroxy-5H-benzofuro [3, 2-c] quinolin- 6-one (V) and 3, 8-dihydroxy-6H-benzofuro [2, 3-b] quinolin-11-one (VI), were obtained by the demethyl-cyclization of 3-(2, 4-dimethoxyphenyl)-4-hydroxy-7-methoxy-1H-quinolin-2- one (IV). By the methylation with diazomethane, V gave a dimethylated compound (VII), while VI gave a trimethylated compound (VIII).
