Used in peptide synthesis as a protected amino acid building block, particularly in the development of pharmaceuticals where fluorinated analogs enhance metabolic stability and bioavailability. The Boc (tert-butoxycarbonyl) group provides temporary amine protection, allowing selective coupling in solid-phase or solution-phase synthesis. The 3,4-difluoro substitution on the aromatic ring can influence peptide conformation and receptor binding affinity, making it valuable in structure-activity relationship (SAR) studies. Commonly applied in the design of enzyme inhibitors and bioactive peptides targeting central nervous system disorders or cancer pathways.