Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors and other biologically active compounds. Its sulfonyl chloride group readily reacts with amines and alcohols, making it valuable for introducing the benzo[b]thiophene moiety into larger molecules. Commonly employed in medicinal chemistry for constructing drug candidates targeting cancer, inflammation, and central nervous system disorders. Also utilized in agrochemical research for designing novel pesticides and herbicides due to its stability and reactivity profile.