Used as a chiral intermediate in the synthesis of pharmaceuticals, particularly in the development of protease inhibitors and other biologically active molecules. Its protected amine and activated alcohol functionalities allow selective coupling and ring-forming reactions. Commonly employed in asymmetric synthesis due to the stereochemical purity of the (R)-enantiomer. The tosylate group serves as a good leaving group for nucleophilic substitution, while the benzyl carbamate (Cbz) protects the nitrogen during multi-step syntheses. Frequently found in routes to drugs targeting viral infections and central nervous system disorders.