Used as a key intermediate in the synthesis of biologically active compounds, particularly in pharmaceutical development. Its structure allows for selective modification in drug design, making it valuable in creating protease inhibitors and other therapeutic agents. The sulfonyl chloride group readily reacts with nucleophiles such as amines or alcohols, enabling efficient formation of sulfonamides or sulfonate esters. The Boc-protected azetidine ring offers stability and controlled deprotection, useful in multi-step syntheses. Commonly applied in medicinal chemistry for constructing constrained ring systems that improve metabolic stability and binding affinity in drug candidates.