Boc-4-Methoxyphenylalanine is widely used in peptide synthesis as a protected amino acid derivative. The Boc (tert-butoxycarbonyl) group serves as a protective group for the amine functionality, allowing selective reactions to occur at other sites of the molecule during peptide chain assembly. This compound is particularly valuable in the synthesis of complex peptides and proteins, where precise control over the sequence and structure is essential. It is also employed in the development of pharmaceuticals, especially in the creation of peptide-based drugs, where the methoxyphenyl group can influence the biological activity and stability of the final product. Additionally, it finds applications in research settings for studying enzyme-substrate interactions and designing enzyme inhibitors.