Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs) requiring high enantiomeric purity. Its protected amine and hydroxyl functional groups allow selective reactions in multi-step organic syntheses. Commonly employed in the preparation of bioactive molecules such as neurokinin antagonists, antiviral agents, and enzyme inhibitors. The tert-butyl carbamate (Boc) protection enables easy deprotection under mild acidic conditions, making it ideal for peptide-like and heterocyclic compound assembly. Its rigid pyrrolidine backbone supports conformational control, enhancing stereoselectivity in drug design.