Simple and practical synthesis of pyrano- and furano[3,2-c]-quinoline derivatives under non-Lewis acid catalysis

One-pot synthesis of substituted pyrano- and furano[3,2-c]quinoline derivatives from appropriately substituted anilines, substituted benzaldehydes and dienophiles via Povarov reaction catalyzed by HCl–ethanol were reported. Good to excellent yields with high diastereoselectivity were obtained in all entries tested.