Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs) requiring stereochemical control. Its protected amine group allows for selective reactions in multi-step organic syntheses. Commonly employed in the preparation of protease inhibitors, kinase inhibitors, and other bioactive molecules in medicinal chemistry. Also utilized in the construction of complex natural products and in drug discovery research due to its structural versatility and compatibility with various coupling reactions.