Used primarily as a reactive intermediate in organic synthesis, this compound is valuable for introducing the 3,4-dihydroisoquinoline moiety into more complex molecules. It is commonly employed in the preparation of pharmaceuticals, particularly in the development of compounds with potential therapeutic effects on the central nervous system. Additionally, it serves as a key building block in the synthesis of sulfonamide derivatives, which are widely explored for their antibacterial and enzyme inhibitory properties. Its sulfonyl chloride group makes it highly reactive, facilitating efficient coupling reactions with amines or alcohols to form sulfonamides or sulfonate esters, respectively. This versatility makes it a useful tool in medicinal chemistry and drug discovery research.