Used in peptide synthesis as a protected intermediate, enabling selective coupling reactions without side-chain interference. Its lactone structure facilitates ring-opening aminolysis, allowing for efficient incorporation into complex peptide sequences. Commonly employed in the preparation of modified peptides and peptidomimetics for pharmaceutical research, particularly in the development of enzyme inhibitors and bioactive molecules. The Boc group provides acid-labile protection, permitting deprotection under mild conditions compatible with sensitive substrates.