Boc-2,3-Difluoro-L-Phenylalanine is a protected, fluorinated amino acid derivative in which the α-amino group is masked as a Boc carbamate and the α-carboxyl group is present as the corresponding free acid functionality for peptide-coupling chemistry. The side chain is a benzyl group bearing two fluorine atoms at the 2 and 3 positions relative to the α-carbon, creating a difluorinated stereodefining environment consistent with the L-phenylalanine backbone and providing increased electron-withdrawing character and altered hydrogen-bonding behavior. This molecule is used in peptide synthesis and structure-activity or chemical biology studies where incorporation of a difluorinated phenylalanine analogue enables controlled modulation of sterics, polarity, and conformational preferences in peptide or protein mimetics.
CAT No: CP12604
Boc-2,3-Difluoro-L-Phenylalanine is a Boc-protected, fluorinated L-phenylalanine building block designed for incorporation of a geminally adjacent difluoro motif into peptide and peptidomimetic structures. The difluoro substitution on the alpha-carbon region introduces distinct steric and electronic properties relative to standard phenylalanine, while the Boc group provides a protected amino functionality compatible with common peptide-assembly workflows. This reagent is frequently selected in medicinal chemistry and peptide chemistry programs aiming to probe structure-activity relationships, conformational effects, and metabolic stability trends associated with fluorinated amino acid analogs.
1. Peptide And Peptidomimetic Building
Boc-2,3-Difluoro-L-Phenylalanine is used as an amino acid building block for constructing peptides and peptidomimetic sequences where the 2,3-difluoro substitution is required at a defined position. Researchers in peptide drug discovery and chemical biology use the Boc-protected format to streamline protected-amino acid handling during segment assembly and downstream coupling steps, enabling systematic replacement of phenylalanine residues with a fluorinated analog. The difluoro motif is particularly valuable when teams want to evaluate how alpha-region fluorination influences backbone electronics and local stereochemical preferences in bioactive peptide scaffolds.
2. Medicinal Chemistry SAR Studies
Boc-2,3-Difluoro-L-Phenylalanine supports structure-activity relationship (SAR) campaigns that explore the impact of fluorinated amino acid incorporation on lead optimization. Medicinal chemistry groups commonly employ this building block to generate analog series in which the side-chain identity remains phenyl while the alpha-carbon region is electronically tuned by the adjacent fluorines. Such analog panels are used to correlate structural changes with observed trends in potency, selectivity, and developability readouts during hit-to-lead and lead-optimization stages, while keeping the synthetic variation localized to a single stereodefined residue.
3. Fluorinated Residue Analog Libraries
Boc-2,3-Difluoro-L-Phenylalanine is well suited for preparing fluorinated residue analog libraries for screening and mechanistic studies of peptide-like molecules. Chemical and process development teams use this reagent to standardize the introduction of a difluoro-L-phenylalanine unit across multiple constructs, supporting parallel synthesis of analogs that differ only in neighboring residues or overall scaffold architecture. The Boc protection helps maintain compatibility with protected-residue workflows, while the fluorinated alpha-region provides a chemically distinct handle for comparing outcomes across otherwise matched series.
4. Pharmaceutical Intermediate Development
Boc-2,3-Difluoro-L-Phenylalanine is also used as a defined, stereochemically controlled intermediate for manufacturing fluorinated amino acid derivatives and peptide fragments in pharmaceutical intermediate development. Process chemists and custom synthesis groups leverage the protected amino functionality to integrate this building block into larger synthetic sequences that require precise incorporation of the difluoro motif. This application is especially relevant when downstream targets are assembled from amino acid fragments where the fluorinated residue must be introduced late in the synthesis with minimized variability in stereochemistry and substitution pattern.
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