Boc-2,5-Difluoro-L-Phenylalanine is a protected, fluorinated amino acid derivative in the phenylalanine family, featuring an L-phenylalanine backbone bearing two fluorine substituents on the aromatic ring at the 2- and 5-positions. The molecule contains an amino group masked as a Boc (tert-butoxycarbonyl) carbamate and a carboxylic acid functional group, with the aryl side chain providing two electron-withdrawing fluorine atoms that can modulate hydrophobicity and aromatic interactions while remaining chemically stable under typical peptide-coupling conditions. As a Boc-protected amino acid, it is used in stepwise peptide synthesis and related structure-activity studies where incorporation of a difluorinated phenylalanine residue is used to probe effects of fluorination on peptide conformation, binding, and analytical behavior.
CAT No: CP12804
Boc-2,5-Difluoro-L-Phenylalanine is a Boc-protected, fluorinated phenylalanine derivative designed for peptide and peptidomimetic synthesis where side-chain electronics and sterics are tuned through fluorine substitution. The two ring fluorine atoms provide a distinct physicochemical profile relative to non-fluorinated phenylalanine, making this building block useful for structure-activity relationship studies and conformational or interaction modulation in synthetic peptides. As a protected amino acid, it is primarily used as a defined intermediate for assembling modified peptide sequences under standard protected-amino-acid workflows.
1. Peptide Building Block
Boc-2,5-Difluoro-L-Phenylalanine supports the incorporation of difluorinated phenylalanine residues into custom peptides prepared by peptide synthesis groups focused on SAR and interaction mapping. The Boc protection enables controlled coupling chemistry consistent with protected-amino-acid assembly strategies, while the 2,5-difluoro substitution on the aromatic ring helps differentiate hydrophobic, polarizable, and electronic contributions from those of unsubstituted phenylalanine. Medicinal chemistry teams commonly use this type of fluorinated amino acid building block to generate peptide analogs with altered aromatic behavior for downstream biological or biophysical evaluation workflows.
2. Peptidomimetic SAR Studies
Boc-2,5-Difluoro-L-Phenylalanine is frequently selected for systematic SAR campaigns where fluorination is used to probe how aromatic ring electronics influence potency, selectivity, and binding-mode hypotheses in peptide-like scaffolds. Research groups developing peptidomimetics and constrained aromatic pharmacophores use this building block to create analog series that vary only the aromatic substitution pattern, improving interpretability of structure-property relationships. The defined stereochemistry and protected amino acid format streamline the preparation of consistent analog panels for screening, hit-to-lead optimization, and mechanism-of-action studies in chemical biology and medicinal chemistry programs.
3. Pharmaceutical Intermediate Development
Boc-2,5-Difluoro-L-Phenylalanine is also used as a specialty intermediate for downstream synthesis of fluorinated amino acid derivatives and related building blocks that feed into larger medicinal chemistry programs. Process and development chemists value the presence of the Boc-protected amino functionality alongside the difluorinated aromatic motif because it provides a stable, well-defined handle for further functionalization steps in the preparation of more complex fragments. In industrial and contract research settings, this reagent format is commonly leveraged to standardize inputs for library synthesis and to reduce variability when producing fluorinated analogs at scale.
4. Protein Engineering Analog Panels
Boc-2,5-Difluoro-L-Phenylalanine is leveraged by protein and enzyme research groups that prepare chemically defined protein analogs, peptide tags, or binding-domain constructs incorporating non-natural aromatic residues for structure-function studies. While it is not a genetically encoded amino acid, its protected, stereodefined form supports chemical assembly routes used to generate site-specific aromatic variants that probe how fluorinated phenylalanine substitutions affect local interactions and conformational preferences. Such analog panels are typically used in biophysical characterization and chemical biology workflows where chemically synthesized sequences provide controlled comparisons against reference constructs.
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