A catalyst-free, green and efficient protocol for the synthesis of methyleneisoxazole-5(4H)-ones supported by ultrasonic irradiation

Abstract

A catalyst-free, green and efficient protocol for the one-pot, multi-component, synthesis of Methyleneisoxazole-5(4H)-ones (4a-l) from the reaction of Ethyl acetoacetate, aromatic aldehyde, and hydroxylamine hydrochloride in ethanol as green solvent under ultrasound irradiation at ambient temperature is described. This protocol offers several positive benefits, including simple handling, rapid reaction time period (≤10 mints), easy workup process, waste-free, gentler reaction conditions, ecologically friendly, cleaner reaction, absence of any a laborious purification and excellent yields.