Used primarily as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs) where stereochemistry plays a critical role. The aminooxy group enables formation of oxime derivatives, making it valuable in bioconjugation, prodrug strategies, and the preparation of enzyme inhibitors. Its tert-butyloxycarbonyl (Boc) protection allows for selective deprotection and coupling in peptide-like synthesis, facilitating use in multi-step organic transformations. Commonly applied in medicinal chemistry for constructing nitrogen-containing heterocycles and in the design of protease inhibitors.