Used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of active pharmaceutical ingredients (APIs) involving pyrrolidine-based structures. The tert-butoxycarbonyl (Boc) group protects the pyrrolidine nitrogen, enabling selective modifications in multi-step organic syntheses and efficient deprotection under mild acidic conditions. This makes it valuable in medicinal chemistry for building complex molecules, including in peptide synthesis and the preparation of protease inhibitors, CNS-active agents, and other bioactive compounds requiring controlled ring structures and protected functional groups.