Concentrated Solar Radiation Aided Green Approach for Preparative Scale and Solvent‐Free Synthesis of 3‐Methyl‐4‐(hetero)arylmethylene Isoxazole‐5(4H)‐ones

An efficient, clean, and environmentally benign approach for the synthesis of 3‐methyl‐4‐arylmethylene isoxazole‐5(4H)‐ones has been developed using concentrated solar radiations (CSR). One pot, multicomponent synthesis from aromatic / heteroaromatic aldehydes, ethyl acetoacetate and hydroxylamine hydrochloride leads to title compounds in high yields. Notably the reaction has been carried out in under solvent and catalyst‐free conditions within a very short time (3 min). Further, the reaction was scaled up to 50 mmol. The present method is also energy efficient and saves almost more than 87 % of energy as compared to the conventional method.