The present report describes the synthesis and anticancer evaluation of certain 11- substituted 6H-indolo [2, 3-b] quinolines and their methylated derivatives. These 6H-indolo [2, 3-b] quinoline derivatives 11–13 were prepared from the commercially available 1, 4- dihydroxyquinoline through alkylation, chlorination, nucleophilic reaction, and ring cyclization. Depending on the ratio of 11,(MeO) 2SO2, and K2CO3, alkylation occurred ...