KF-Al2O3 catalyzed One-Pot Synthesis of Benzo[α]xanthene-11-ones

KF-Al2O3 as a recyclable basic catalyst for the one-pot synthesis of benzoxanthenone derivatives by the reaction of aromatic aldehydes, β-naphthol and dimedone in the presence of a catalyst in ethanol under microwave irradiation. The protocol is environmentally benign, offering access to a range of benzoxanthenone derivaties in good to excellent yields.