Used as an intermediate in the synthesis of biologically active compounds, particularly in the development of pharmaceuticals. Its chiral structure makes it valuable in asymmetric synthesis, where stereochemistry is critical, such as in the production of protease inhibitors or receptor agonists. The tosyl group acts as a leaving group, enabling nucleophilic substitution reactions, while the Boc-protected amine allows for selective deprotection and further functionalization. Commonly employed in medicinal chemistry for constructing complex nitrogen-containing molecules.