Used as an intermediate in pharmaceutical synthesis, particularly in the development of active pharmaceutical ingredients (APIs) where the pyrrolidine ring serves as a structural scaffold. The presence of the chloromethyl group allows for further alkylation or nucleophilic substitution reactions, enabling the introduction of various functional groups. The tert-butoxycarbonyl (Boc) protecting group ensures selective reactivity by shielding the nitrogen during multi-step syntheses. Commonly employed in the preparation of protease inhibitors, receptor agonists, and other bioactive molecules requiring a constrained amine moiety. Its versatility makes it valuable in medicinal chemistry for constructing complex nitrogen-containing heterocycles.