Boc-4-Amino-L-phenylalanine is widely used in peptide synthesis as a protected amino acid. The Boc (tert-butyloxycarbonyl) group serves as a protective group for the amino functionality, preventing unwanted reactions during peptide chain assembly. This compound is particularly valuable in solid-phase peptide synthesis (SPPS), where it allows for the controlled and sequential addition of amino acids to build complex peptides. After the peptide chain is assembled, the Boc group can be selectively removed under mild acidic conditions, revealing the free amino group for further reactions. Additionally, it is employed in the synthesis of modified peptides and peptidomimetics, where precise control over amino acid incorporation is essential. Its application extends to the development of pharmaceuticals, bioactive peptides, and research tools in biochemistry and molecular biology.