Fmoc-2-Bromo-D-Phenylalanine

Fmoc-2-Bromo-D-Phenylalanine is an Fmoc-protected D-phenylalanine derivative bearing a stereogenic center at the alpha carbon and a bromine substituent at the 2-position relative to the carboxylate-bearing backbone. The molecule combines an aromatic phenyl side chain with an activated halomethyl-like handle at the alpha position, while the Fmoc group provides base-labile N-protection compatible with solid-phase peptide synthesis. The presence of the Cα-Br bond introduces a reactive electrophilic site that can participate in halogen-based transformations or serve as a controlled leaving group during downstream derivatization. The chiral, N-Fmoc-protected amino acid format makes it suitable for stereochemically defined peptide building block preparation and for generating functionalized amino acid analogs through subsequent chemical modification.

1. Peptide Synthesis

Fmoc-2-Bromo-D-Phenylalanine is used in peptide building block preparation where Fmoc N-protection enables standard peptide coupling chemistries and orthogonal deprotection on resin. The D-configuration at the alpha stereocenter supports incorporation of D-amino acid motifs into peptides, allowing stereodefined backbones for peptide analog construction and stability-focused design. The Cα-bromine substituent can be retained through coupling steps or transformed after assembly to introduce further functionality at the backbone position. Downstream, the resulting peptides and peptide fragments can be applied in research-grade scaffold generation and in synthetic methodology development for halogenated amino acid incorporation.

2. Amino Acid Derivatization

Fmoc-2-Bromo-D-Phenylalanine serves as a chiral amino acid intermediate for amino acid derivatization strategies that exploit the electrophilic Cα-Br bond. The protected amine and carboxyl framework allow selective functional group manipulation while maintaining a defined stereochemical relationship between the side chain and the alpha position. Bromine substitution can enable nucleophilic substitution or related halogen-based transformations to access amino acid analogs bearing modified backbone substituents, including amine, thioether, or other nucleophile-derived functionalities depending on conditions. The Fmoc handle further supports iterative synthesis, where modified derivatives can be reintroduced into peptide sequences or used as standalone chiral building blocks for fine chemical synthesis.

3. Peptidomimetics And SAR

Fmoc-2-Bromo-D-Phenylalanine is applied in peptidomimetic construction and structure-activity relationship studies where backbone-functionalized D-amino acid residues help probe steric and electronic effects. The combination of a phenyl side chain and a reactive alpha-bromine site enables generation of constrained or electronically tuned analogs that can be compared across a series of structure-defined compounds. Fmoc protection supports rapid assembly of analog libraries via parallel peptide synthesis workflows, while post-synthetic conversion of the bromine can diversify backbone substitution patterns. The resulting stereochemically defined analogs can be used as research intermediates for SAR mapping and for developing molecular recognition probes in chemical biology.

4. Chemical Biology Probes

Fmoc-2-Bromo-D-Phenylalanine is suitable for chemical biology research intermediate preparation where a halogenated, chiral amino acid can be converted into labeling-ready motifs. The electrophilic Cα-Br position can be leveraged to install functional groups that support conjugation chemistry, such as nucleophile-derived linkers or reactive handles for subsequent coupling to biomolecular targets. The Fmoc-protected amine allows controlled handling during synthesis and can be removed when integrating the residue into longer constructs or when generating free amino acid derivatives for probe assembly. The D-configuration contributes stereochemical control that can affect binding orientation and probe behavior in biochemical assays, supporting robust molecular design workflows.

5. Pharmaceutical Intermediate Preparation

Fmoc-2-Bromo-D-Phenylalanine is used in pharmaceutical intermediate preparation and process chemistry development for manufacturing routes that require stereodefined, N-protected amino acid derivatives. The Fmoc group provides a protected amine suitable for stepwise synthesis, while the alpha-bromine functionality can serve as a controlled intermediate for converting to alternative backbone substituents used in medicinal chemistry programs. The aromatic side chain and the chiral center support incorporation into larger fragments or peptide-like intermediates used for downstream derivatization. The resulting materials can be employed as well-defined chemical building blocks for fine chemical synthesis and for producing halogenated or backbone-modified amino acid components used in industrial-scale synthesis planning.

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