Used as a key chiral intermediate in the synthesis of protease inhibitors, particularly in the development of antiviral drugs such as hepatitis C virus (HCV) NS3/4A protease inhibitors. Its stereochemistry allows for selective binding and improved efficacy in drug candidates. The epoxide group enables further functionalization, while the tert-butoxycarbonyl (Boc) protecting group stabilizes the amine during multi-step syntheses. Commonly employed in pharmaceutical research for constructing complex bioactive molecules requiring high enantiomeric purity.