Fmoc-2,4,6-Trifluoro-L-Phenylalanine is a protected, fluorinated amino acid derivative in which L-phenylalanine bears three fluorine atoms at the 2, 4, and 6 positions of the aromatic ring and the α-amino group is masked with an Fmoc (9-fluorenylmethoxycarbonyl) protecting group. The molecule retains a free carboxylic acid functionality and features an aromatic side chain with electron-withdrawing fluorine substituents that modulate hydrophobicity and steric/electronic characteristics relevant to peptide structure. It is used as an amino acid building block for stepwise peptide synthesis, including solid-phase peptide synthesis workflows where the Fmoc group enables controlled deprotection and incorporation of the trifluorinated phenylalanine residue into peptide sequences for structure-activity and chemical biology studies.
CAT No: CP17006
Fmoc-2,4,6-Trifluoro-L-Phenylalanine is an Fmoc-protected L-phenylalanine derivative bearing three fluorine atoms on the aromatic ring at the 2,4,6-positions, creating a strongly electron-withdrawing, metabolically stable aryl environment. The molecule contains a chiral α-carbon typical of amino acid building blocks, a carbamate-protected amine compatible with standard solid-phase peptide synthesis, and a free carboxyl functionality that can be activated for amide bond formation. The trifluorinated side chain influences conformational preferences and aromatic interaction patterns, while the Fmoc group provides orthogonal protection during peptide assembly and subsequent deprotection. This structure makes the compound a chiral amino acid intermediate and peptide building block suited for incorporation of fluorinated phenylalanine motifs into peptides, peptidomimetics, and structure-defined analog libraries.
1. Peptide Synthesis
Fmoc-2,4,6-Trifluoro-L-Phenylalanine is used in peptide synthesis workflows where Fmoc-based N-protection and a reactive carboxyl group enable controlled peptide coupling. The Fmoc carbamate stabilizes the amino function during chain elongation, while the L-configuration at the α-carbon supports stereochemically defined incorporation into growing peptide sequences. The 2,4,6-trifluorophenyl side chain can participate in hydrophobic packing and modulate aromatic and halogen-bonding interactions that often govern peptide conformation and binding. Fluorinated phenylalanine residues can be introduced for generating peptide analogs for biochemical research and for producing fluorinated peptide intermediates used in downstream derivatization and analytical reference standards. The amino acid backbone and protection pattern align with established peptide assembly logic in both academic synthesis and industrial fine chemical manufacturing.
2. Peptidomimetics And SAR
Fmoc-2,4,6-Trifluoro-L-Phenylalanine supports medicinal chemistry and SAR-oriented library construction by providing a stereodefined, electron-poor aryl side chain that can tune binding-site interactions. The trifluorinated aromatic ring provides a handle for studying how ring electronics and halogen substitution patterns affect target engagement, while the α-amino acid framework preserves the geometry required for peptide-like recognition. Fmoc protection enables stepwise incorporation into peptidomimetic scaffolds where later functional group transformations may be performed on other side chains without disturbing the fluorinated motif. Structure-defined analogs prepared from this building block can be used to evaluate structure-activity relationships in fragment-to-lead and peptide-optimization programs, including the generation of well-characterized intermediates for analytical method development. The compound thereby functions as a chiral fluorinated amino acid unit for systematic molecular design.
3. Chemical Biology Labeling
Fmoc-2,4,6-Trifluoro-L-Phenylalanine is applied in chemical biology research where fluorinated aromatic residues serve as stable tags within peptide or protein fragments. The Fmoc-protected amine allows incorporation at specific positions during peptide synthesis, enabling site-controlled placement of the trifluorinated phenylalanine motif in probes, substrates, or binding partners. The 2,4,6-trifluoro pattern can be leveraged for spectroscopic distinguishability and for modulating local hydrophobicity and electrostatics in recognition events. Downstream, the resulting fluorinated peptides can be used as intermediates for conjugation strategies such as coupling to linkers or attachment handles introduced elsewhere in the molecule. The amino acid derivative thus bridges protected amino acid synthesis with biomolecule-focused probe construction.
4. Protected Amino Acid Chemistry
Fmoc-2,4,6-Trifluoro-L-Phenylalanine is suitable for protected amino acid chemistry and orthogonal protection planning in multi-protection synthetic sequences. The Fmoc group provides a removable N-protection strategy compatible with peptide assembly conditions, while the carboxyl functionality supports activation to form amide bonds under standard coupling logic. The presence of a trifluorinated aromatic ring can influence reactivity during activation and subsequent coupling by altering electron density, which may be relevant when designing robust process chemistry intermediates. The chiral amino acid intermediate format enables selective deprotection and re-protection steps when building longer sequences or when preparing modular fragments for combinatorial synthesis. This protection-and-activation profile makes the compound a practical component for manufacturing routes that require reproducible protected amino acid handling.
5. Pharmaceutical Intermediate Preparation
Fmoc-2,4,6-Trifluoro-L-Phenylalanine is relevant to pharmaceutical intermediate preparation where fluorinated amino acid residues are incorporated into drug-like peptide fragments, peptidomimetics, or biochemical tool compounds. The protected amino acid framework supports scalable peptide fragment construction, with the Fmoc carbamate enabling controlled N-terminal formation and subsequent coupling steps that preserve stereochemistry. The 2,4,6-trifluorophenyl side chain can be used to generate intermediates with improved metabolic stability profiles in structure-defined analog series, while also providing consistent physicochemical properties for downstream purification and formulation screening. The resulting fluorinated peptide building blocks can be carried forward into further functionalization, such as side-chain modification on other residues or conversion into activated derivatives for final assembly. The compound's compatibility with peptide coupling logic and its defined stereochemical identity align with fine chemical synthesis and industrial manufacturing intermediate preparation needs.
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