Used as an intermediate in the synthesis of pharmaceuticals, particularly in the preparation of bioactive pyrrolidine-containing compounds. Its protected amine group and activated hydroxyl function allow selective transformations in multi-step organic syntheses. Commonly employed in the development of protease inhibitors and central nervous system agents. The tosylate group serves as a good leaving group, enabling nucleophilic substitution reactions, while the tert-butoxycarbonyl (Boc) group provides amine protection under various reaction conditions.