Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of neurologically active compounds. Its protected amine group and alkyne functionality allow for selective reactions in multi-step organic syntheses. The ethynyl group enables click chemistry applications, such as Huisgen cycloaddition, useful in drug discovery and bioconjugation. Commonly employed in the preparation of protease inhibitors and central nervous system agents due to its rigid pyrrolidine scaffold and stereochemical purity.