A number of dioxolane, dioxane, and dioxepine quinazoline derivatives have been synthetized and evaluated as EGFR inhibitors. Their cytotoxic activity has been tested against two cell lines overexpressing and not expressing EGFR. Most derivatives were able to counteract EGF-induced EGFR phosphorylation, and their potency was comparable to the reference compound PD153035. The size of the fused dioxygenated