Boc-β-homoarginine(Tos) is primarily used in peptide synthesis as a protected amino acid derivative. It serves as a building block for constructing peptides with specific sequences, particularly those requiring homoarginine residues. The Boc (tert-butyloxycarbonyl) group protects the amino group, while the Tos (tosyl) group safeguards the guanidine functionality during the synthesis process. This ensures selective reactions and prevents unwanted side reactions. It is especially valuable in research and development of bioactive peptides, pharmaceuticals, and compounds targeting enzyme inhibition or receptor binding. Its stability and compatibility with solid-phase peptide synthesis make it a crucial reagent in medicinal chemistry and biochemistry studies.