Fmoc-2,3-Dichloro-L-Phenylalanine is an Fmoc-protected, L-phenylalanine-derived amino acid bearing two chlorine substituents at the 2- and 3-positions of the aromatic ring. The molecule contains an Fmoc carbamate protecting group on the amino functionality and an unprotected carboxylic acid, while the dichloro-substituted phenyl side chain provides increased hydrophobicity and halogen-based electronic effects relative to unsubstituted phenylalanine. In peptide chemistry, the protected amino acid is used as a building block for stepwise incorporation into peptide sequences, including solid-phase peptide synthesis, where the Fmoc group supports controlled coupling and the carboxyl group participates in amide bond formation.
CAT No: CP12006
Fmoc-2,3-Dichloro-L-Phenylalanine is an Fmoc-protected L-phenylalanine derivative bearing two chlorine atoms at the 2,3-positions of the aromatic ring, creating a halogenated, sterically and electronically modified side chain while retaining the chiral amino acid backbone for peptide coupling. The molecule contains an N-terminal Fmoc carbamate that supports solid-phase peptide synthesis compatibility and an α-carboxyl-derived functionality suitable for forming amide bonds after activation. The dichloro substitution pattern increases hydrophobic character and alters aromatic reactivity, enabling downstream transformations such as selective dehalogenation or cross-coupling chemistry on the side-chain aryl unit. The stereogenic center at the α-carbon is fixed in the L-configuration, supporting stereochemically defined incorporation into peptide sequences and chiral structure-property studies.
1. Peptide Synthesis
Fmoc-2,3-Dichloro-L-Phenylalanine is applied in peptide building workflows where Fmoc protection enables stepwise N-terminal deprotection and amide bond formation. The protected amino group and the carboxyl functionality allow standard peptide coupling chemistry, while the L-stereocenter ensures stereodefined incorporation into growing peptide chains. The 2,3-dichloro substituted phenyl side chain functions as a robust aryl handle that can influence conformational preferences, hydrophobic packing, and local electronic environment within peptide scaffolds. The resulting dichloro-phenylalanine-containing peptides can be used as research materials for studying sequence effects, receptor binding motifs, and halogen-driven structure-activity relationship trends, as well as for generating defined peptide intermediates for further derivatization.
2. Peptidomimetics And SAR
Fmoc-2,3-Dichloro-L-Phenylalanine serves in peptidomimetic and SAR-oriented molecular design where halogenated aromatic side chains provide tunable lipophilicity and electronic modulation. The aryl dichloro pattern at the phenylalanine side chain can participate in structure-property investigations by systematically varying substitution patterns while maintaining the same amino acid stereochemistry. The Fmoc-protected backbone supports incorporation into constrained peptide analogs, enabling comparative studies of binding-site interactions and conformational effects across closely related analog series. Downstream, the aryl chlorides can be leveraged for late-stage diversification via cross-coupling or dehalogenation strategies, supporting iterative fine chemical synthesis of analog libraries for medicinal chemistry and chemical biology research.
3. Side-Chain Functionalization
Fmoc-2,3-Dichloro-L-Phenylalanine is suitable for synthetic organic chemistry routes that exploit aryl chloride reactivity for controlled functional group installation. The compound's dichloro-substituted aromatic ring provides electrophilic sites for coupling reactions, while the Fmoc group supports orthogonal protection logic during multi-step synthesis. The preserved amino acid framework enables conversion into peptide-ready intermediates when the Fmoc group is removed under peptide-compatible conditions, allowing the aryl chloride functionality to remain available for subsequent derivatization. The resulting functionalized derivatives can be used to prepare labeled or scaffold-modified amino acid building blocks, generate halogenated aryl-containing peptide analogs, and support downstream synthesis of complex intermediates used in applied chemical development.
4. Chemical Biology Probes
Fmoc-2,3-Dichloro-L-Phenylalanine is utilized in chemical biology contexts where defined amino acid incorporation into peptides supports probe construction and molecular recognition studies. The Fmoc-protected amino acid enables controlled placement of the halogenated aromatic side chain into peptide probes, supporting reproducible physicochemical properties that affect binding and stability in assay-relevant environments. The dichloro phenyl group can be retained as a structural element to modulate hydrophobic interactions or can be transformed into additional functionalities for conjugation-ready handles after peptide assembly. The stereochemically defined L-configuration and the peptide-compatible protection strategy help generate probe molecules for studying protein-peptide interactions, binding-site mapping, and mechanistic interrogation through sequence-defined analogs.
5. Pharmaceutical Intermediate Preparation
Fmoc-2,3-Dichloro-L-Phenylalanine is applied as a defined chiral intermediate in pharmaceutical and fine chemical manufacturing workflows that require halogenated amino acid derivatives. The Fmoc-protected form supports reproducible solid-phase or solution-phase peptide intermediate preparation, where N-terminal protection and orthogonal deprotection enable controlled assembly of complex intermediates. The dichloro-substituted aromatic side chain can function as a chemically stable motif through manufacturing steps and can later be converted into diversified aryl substituents depending on the target scaffold requirements. The resulting peptide building blocks and downstream modified derivatives can serve as process chemistry intermediates for generating structured small-molecule precursors, peptidomimetic fragments, or intermediate materials used in specialty chemical production.
6. Analytical Research Standards
Fmoc-2,3-Dichloro-L-Phenylalanine supports analytical method development and reference material preparation where defined halogenated amino acid structures improve traceability in LC-MS and related characterization workflows. The Fmoc group and the fixed L-stereochemistry provide a consistent molecular signature that can be used to monitor derivatization, coupling efficiency, and identity of peptide building blocks during synthesis. The dichloro aromatic side chain increases mass and distinctive fragmentation patterns, which can facilitate targeted detection in complex reaction mixtures and peptide analysis. The compound can therefore be employed to prepare standards for peptide synthesis QA/QC, to benchmark analytical separation of halogenated amino acid-containing species, and to support structural confirmation for amino acid derivative and peptide analog characterization in research and industrial analytical laboratories.
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