Fmoc-2,4-Difluoro-L-Phenylalanine is an Fmoc-protected, L-phenylalanine-derived amino acid bearing two fluorine atoms at the 2- and 4-positions of the aromatic side chain, placing it in the class of fluorinated, non-natural amino acid building blocks for peptide chemistry. The molecule contains an Fmoc carbamate on the amino group and a free carboxylic acid, while the difluorinated benzyl side chain provides altered electronic and steric properties relative to unsubstituted phenylalanine. In synthesis workflows, this protected amino acid is used as a stepwise coupling component in peptide assembly and as a chemically defined residue for structure-activity studies, protein labeling strategies, or analytical method development where fluorinated aromatic functionality is required.
CAT No: CP12706
Fmoc-2,4-Difluoro-L-Phenylalanine is an Fmoc-protected L-phenylalanine analog bearing two fluorine atoms on the aromatic ring at the 2- and 4-positions. The molecule combines an N-Fmoc protecting group for controlled amine unmasking with a stereodefined α-amino acid backbone, where the L-configuration governs peptide coupling stereochemistry. Aromatic difluorination modulates electronic density, lipophilicity, and hydrogen-bonding patterns relative to unsubstituted phenylalanine, while the side chain remains compatible with standard peptide chemistry conditions. The presence of fluorine substituents also enables downstream functionalization routes and spectroscopically trackable analog development for medicinal chemistry and structure-guided synthesis.
1. Peptide Synthesis
Fmoc-2,4-Difluoro-L-Phenylalanine is used in peptide building and solid-phase peptide synthesis where the Fmoc group enables orthogonal N-protection and stepwise chain elongation. The L-α-amino acid stereocenter and carboxyl functionality support amide-bond formation using standard peptide coupling chemistries, while the difluorinated phenyl side chain provides electronically tuned aromatic character for incorporating fluorinated residues into peptides. Aromatic fluorine substitution can influence conformational preference and side-chain packing, which is useful for generating peptide analogs for binding studies and stability screening. Incorporation into peptide sequences supports downstream deprotection and cleavage workflows typical of protected amino acid derivatives, yielding fluorinated peptide intermediates for chemical biology and materials-oriented peptide design.
2. Drug Discovery
Fmoc-2,4-Difluoro-L-Phenylalanine is applied in medicinal chemistry programs that require fluorinated amino acid residues to modulate physicochemical properties and improve structure-activity relationship mapping. The difluorinated aromatic ring can alter aryl electronics and polar surface interactions without introducing additional heteroatoms, and the Fmoc-protected amino acid form supports rapid assembly of peptidomimetic scaffolds. Incorporation into short peptides, constrained peptidomimetics, or SAR-focused libraries enables systematic evaluation of how aromatic fluorination affects target recognition and metabolic stability proxies through chemical structure control. The stereodefined L-backbone ensures consistent spatial presentation of the side chain during scaffold construction, supporting coherent analog generation for structure-guided design workflows.
3. Side-Chain Functionalization
Fmoc-2,4-Difluoro-L-Phenylalanine is suitable for synthetic organic chemistry routes that leverage aryl fluorine as a handle for further derivatization or for preparing fluorine-containing intermediates. The aromatic difluorination pattern can participate in selective substitution chemistry under appropriate conditions, enabling access to substituted aryl derivatives while maintaining the protected amino acid framework until deprotection is performed. The Fmoc group supports staged synthesis, where side-chain transformations can be planned relative to N-unmasking, allowing controlled construction of C-terminal or side-chain modified amino acid derivatives. Downstream conversion of the difluorinated aryl residue into additional substituents supports fragment expansion, scaffold diversification, and preparation of labeled or probe-like analogs used in biochemical research intermediate preparation.
4. Chemical Biology Probes
Fmoc-2,4-Difluoro-L-Phenylalanine is used in chemical biology workflows that require fluorinated residues for tracking, binding-site interrogation, or incorporation into probe peptides. The Fmoc protection supports reliable peptide assembly, while the difluorinated phenyl ring can serve as a spectroscopically informative element for NMR-based monitoring and comparative studies across analog series. The L-configuration ensures consistent stereochemical placement of the aromatic side chain in peptide constructs used for receptor binding assays, enzyme substrate mapping, or competition experiments. Fluorine substitution can also influence local microenvironment interactions, enabling chemically defined probe generation for studying structure-function relationships in biomolecular recognition.
5. Pharmaceutical Manufacturing
Fmoc-2,4-Difluoro-L-Phenylalanine is relevant to pharmaceutical intermediate preparation for fluorinated peptide-like substances and peptide-derived building blocks used in process chemistry. The Fmoc-protected amino acid format aligns with manufacturing-friendly protection strategies that separate stable storage of the protected amine from later deprotection and coupling steps. The stereodefined L-amino acid and difluorinated aromatic side chain support reproducible incorporation into defined sequences, enabling consistent batch-to-batch molecular identity for downstream purification and analytical characterization. The fluorinated aromatic residue can also function as a controlled structural element in manufacturing routes for fine chemical synthesis of fluorinated intermediates and peptidomimetic precursors.
6. Analytical Research Standards
Fmoc-2,4-Difluoro-L-Phenylalanine is employed as an analytical reference material and calibration component in studies involving fluorinated amino acid derivatives and peptide analog characterization. The combination of an Fmoc tag and a difluorinated aromatic side chain provides distinct chromatographic and spectroscopic signatures that can support method development for LC-MS, NMR, and related analytical research workflows. The defined L-stereochemistry and protected functional groups facilitate consistent derivatization behavior when used to benchmark deprotection, coupling, or peptide cleavage outcomes in analytical method validation. Use of this chiral, fluorinated amino acid intermediate supports reliable identification of fluorinated residues in complex peptide mixtures and supports downstream quality-by-design oriented characterization in applied amino acid chemistry.
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