An ultrasound-accelerated one-pot procedure has been explored for the synthesis of 8-aryl-7,8-dihydro-[1,3]-dioxolo[4,5-g]quinolin-6(5H)-one derivatives using the reaction between 3,4-methylendioxyaniline 1, aldehyde 2 and isopropylidene malonate 3 under catalyst-free and solvent-free conditions. High yields of the products, mild reaction condition, environmentally friendly procedure, catalyst- and solvent-free conditions are the main advantages of this protocol.