Abstract
The ZnCl2-catalyzed three-component synthesis of pyrano[3,2-c]quinolin-5(6H)-ones from the domino reactions of 4-hydroxy-1-methylquinolin-2(1H)-one, nitroketene N,S-methylacetal, and aromatic aldehydes in ethanol in good yields is described. This domino transformation leads to the formation of one ring by creation of two C–C bonds and one C–O bond in a single synthetic operation.