Boc-2,4-Difluoro-L-Phenylalanine is a protected, fluorinated phenylalanine derivative in which the amino group is masked as a Boc carbamate and the side chain is a substituted benzyl bearing two fluorine atoms at the 2- and 4-positions relative to the benzylic linkage. The molecule contains the Boc-protected α-amino functionality and a free carboxylic acid, with the fluorinated aromatic ring providing altered electronic character and steric effects while retaining an L-configuration at the α-carbon as indicated by the name. It is used as a building block for peptide synthesis and structure-activity or chemical biology studies where fluorinated aromatic residues and Boc protection are employed to control chemoselectivity during stepwise coupling and to incorporate a defined difluorophenylalanine motif into peptide analogues.
CAT No: CP12704
Boc-2,4-Difluoro-L-Phenylalanine is an L-phenylalanine derivative bearing two fluorine atoms on the aromatic ring and a Boc protecting group on the amino functionality. The difluoro-substituted side chain provides strong electronic and steric modulation while retaining the amino acid backbone required for peptide assembly. As a Boc-protected, aryl-fluorinated building block, it is commonly used to introduce fluorinated aromatic residues into peptides and peptide-like structures for medicinal chemistry and chemical biology workflows.
1. Peptide Building Block
Boc-2,4-Difluoro-L-Phenylalanine is used as a protected amino acid building block for incorporating a difluorinated phenylalanine residue into custom peptides and peptide libraries. Medicinal chemistry groups and peptide synthesis specialists select this residue to probe how aromatic fluorination affects conformation, local polarity, and physicochemical properties of peptide scaffolds while keeping the peptide coupling workflow aligned with Boc-based strategies. The Boc protection supports controlled stepwise assembly, enabling the preparation of analog series where the fluorinated aromatic side chain is the key structural variable.
2. Medicinal Chemistry Analog Design
Boc-2,4-Difluoro-L-Phenylalanine supports structure-activity relationship (SAR) studies in small-molecule and peptide-drug discovery programs that rely on fluorinated amino acid incorporation to tune properties of lead series. Chemical biology and medicinal chemistry teams use this building block to generate analogs with altered electronic distribution and hydrogen-bonding behavior around the aromatic ring, which can be important when mapping binding-site interactions or optimizing target engagement through iterative design. The difluoro substitution pattern is particularly valuable when researchers want to introduce a chemically stable aromatic modification that remains distinct from standard phenylalanine in downstream characterization.
3. Protein and Peptide Engineering Studies
Boc-2,4-Difluoro-L-Phenylalanine is applied in protein and peptide engineering efforts that require site-specific incorporation of fluorinated aromatic residues into peptide segments used as probes, binders, or structural mimics. Researchers in chemical biology and protein chemistry use fluorinated phenylalanine analogs to create defined perturbations in aromatic microenvironments for mechanistic studies, epitope mapping, or conformational analysis of peptide domains. By using a Boc-protected amino acid building block, teams can prepare well-defined fluorinated peptide constructs for downstream biophysical characterization and comparative studies against non-fluorinated controls.
4. Pharmaceutical Intermediate Development
Boc-2,4-Difluoro-L-Phenylalanine is also used as a specialized intermediate in the development of fluorinated amino acid derivatives and related building blocks for pharmaceutical research. Process development and intermediate manufacturing teams rely on this protected, difluoro-aromatic amino acid to access downstream structures where the difluorinated phenyl ring is retained as a key pharmacophore-like element. In these workflows, the Boc-protected functionality provides a convenient protected handle for further derivatization and controlled conversion into other protected or activated amino acid forms used in synthesis planning.
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