Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of protease inhibitors and other bioactive molecules. Its structure allows for selective functionalization, making it valuable in constructing complex organic molecules. The tosylate group acts as a good leaving group, enabling nucleophilic substitution reactions, while the Boc-protected amine provides a handle for further derivatization under mild conditions. Commonly employed in medicinal chemistry for building constrained peptidomimetics and in the preparation of enzyme inhibitors where stereochemistry plays a critical role in biological activity.