Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of protease inhibitors and other bioactive molecules. Its stereochemistry and functional groups make it valuable for constructing complex organic compounds with high enantioselectivity. Commonly employed in peptide mimetics and drug design where side chain branching and stereocontrol are critical. The Boc-protected amine allows for selective deprotection and coupling in multi-step syntheses, especially in the preparation of active pharmaceutical ingredients (APIs).