Boc-2,4,5-Trifluoro-L-Phenylalanine is a protected, fluorinated amino acid derivative in which the phenylalanine backbone bears three fluorine substituents at the 2, 4, and 5 positions of the aromatic ring and the α-amino group is protected as a Boc carbamate. The molecule contains a free carboxylic acid functional group and an L-stereocenter as indicated by the name, with the electron-withdrawing fluorines modulating the aromatic side-chain's polarity and chemical behavior while the Boc group suppresses unprotected amine reactivity during handling and coupling. It is used as a building block for stepwise peptide synthesis and for structure-activity or chemical biology studies where fluorinated aromatic side chains and controlled amine protection are needed to prepare more complex amino acid and peptide derivatives.
CAT No: CP16904
Boc-2,4,5-Trifluoro-L-Phenylalanine is a Boc-protected L-phenylalanine derivative bearing three fluorine atoms on the aromatic ring, creating a strongly electron-withdrawing, metabolically and physicochemically distinctive side chain while retaining the amino acid backbone for peptide assembly. The Boc group provides an N-protected handle commonly used in protected amino acid building-block workflows, where the fluorinated phenyl ring is leveraged to tune aromatic interactions, conformational preferences, and analytical behavior in synthetic peptide and medicinal chemistry programs.
1. Fluorinated Peptide Building Blocks
Boc-2,4,5-Trifluoro-L-Phenylalanine is used as a protected amino acid building block for incorporating a highly fluorinated aromatic residue into peptides during custom peptide synthesis. Medicinal chemistry and peptide research groups select the 2,4,5-trifluoro-phenylalanine side chain to modulate hydrophobicity and aromatic electronics relative to unsubstituted phenylalanine, supporting structure-activity relationship (SAR) studies where subtle changes in aromatic character can influence peptide properties. The Boc-protected amino functionality supports standard protected-amino-acid coupling workflows used to generate defined sequences containing this non-natural aromatic residue.
2. Peptidomimetic SAR Studies
Boc-2,4,5-Trifluoro-L-Phenylalanine serves as a key intermediate for preparing peptidomimetics and fluorinated analog libraries where aromatic fluorination is used as a design element rather than a generic "fluorinated tag." Research teams in chemical biology and medicinal chemistry frequently incorporate this residue to probe how electron-withdrawing fluorines affect local conformation, backbone/side-chain packing, and receptor or binding-site complementarity in model systems. Because the compound is provided as an N-protected amino acid derivative, it fits directly into downstream assembly of analogs that require consistent stereochemistry and a defined fluorinated aromatic pharmacophore.
3. Pharmaceutical Intermediate Development
Boc-2,4,5-Trifluoro-L-Phenylalanine is also used as a specialized pharmaceutical intermediate for the synthesis of fluorinated amino acid derivatives and advanced building blocks that feed into larger molecule construction. Process and development chemists value the trifluorinated aromatic ring for its ability to introduce a robust, chemically stable motif into drug-discovery scaffolds, while the Boc protection supports controlled incorporation into larger synthetic sequences. This makes the reagent practical for preparing defined fluorinated fragments used in lead optimization campaigns and in the manufacture of research quantities of fluorinated compounds for SAR and analytical characterization.
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