Used as a key intermediate in organic synthesis, particularly in the preparation of sulfonamide derivatives. It is commonly employed in pharmaceutical manufacturing to introduce the 5-methylpyridine-2-sulfonyl group, which can enhance the biological activity, solubility, or metabolic stability of drug candidates. Its reactivity with amines and alcohols makes it valuable for forming sulfonate esters and sulfonamides, important structural motifs in medicinal chemistry. Also utilized in agrochemicals and dyes for modifying molecular properties through sulfonylation reactions.