Fused α-pyrones were obtained in a convenient and green protocol from Baylis–Hillman acetates and various cyclic dicarbonyl compounds in the presence of basic ionic liquid 1-butyl-2,3-dimethylimidazolium hydroxide ([bdmim]OH) under ultrasonic irradiation. This method provided the desired α-pyrones in good to high yields (82–98 %) and lower reaction times (5–15 min).