Abstract The preparation of novel pyrano [3, 2-c] quinolin-2, 5 (6H)-dione and 2H, 5H-pyrano [3, 2-c] chromene-2, 5-dione derivatives starting from 4-hydroxyquinolin-2 (1H)-ones and 4- hydroxy-2H-chromene-2-one with chlorocarbonyl ketenes is described. This method provides a new route to produce fused pyrano derivatives in good to excellent yields in a short experimental time.
