Used in peptide synthesis as a protected amino acid building block, enabling selective coupling in solid-phase and solution-phase peptide assembly. The Boc (tert-butoxycarbonyl) group provides temporary N-terminal protection, while the methyl ester protects the C-terminus, allowing controlled deprotection and chain elongation. The homoallylglycine moiety introduces a non-natural amino acid side chain with an alkene functionality, useful for post-synthetic modifications such as olefin metathesis or functionalization via epoxidation and dihydroxylation. Commonly employed in the synthesis of bioactive peptides and peptidomimetics where structural diversity and side-chain engineering are required.