Used as an intermediate in the synthesis of pharmaceuticals, particularly in the preparation of β-lactam antibiotics and other bioactive heterocyclic compounds. Its reactive acyl chloride group allows for easy amide bond formation, making it valuable in constructing drug scaffolds. Commonly employed in medicinal chemistry for modifying isoxazole-based structures to enhance biological activity or pharmacokinetic properties. Also utilized in agrochemical synthesis for developing novel pesticides with improved efficacy.