Used as a key chiral intermediate in the synthesis of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs) requiring stereochemical control. Its protected amine and reactive chlorine functionality allow selective coupling and ring-forming reactions, making it valuable in constructing complex nitrogen-containing heterocycles. Commonly employed in the production of antiviral agents, central nervous system drugs, and kinase inhibitors. The Boc group ensures stability during multi-step syntheses and can be easily removed under mild acidic conditions, enabling further functionalization.