Used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of fluorinated aromatic molecules with enhanced metabolic stability. Commonly employed in peptide coupling reactions and solid-phase synthesis due to the presence of both carboxylic acid and protected amine functional groups. The tert-butoxycarbonyl (Boc) group allows for selective deprotection under mild acidic conditions, enabling stepwise construction of complex molecules. Frequently found in routes to bioactive molecules, including kinase inhibitors and other therapeutic agents where fluorine substitution improves binding affinity or pharmacokinetic properties.