Fmoc-4-Bromo-D-Phenylalanin

Fmoc-4-Bromo-D-Phenylalanin is an Fmoc-protected, D-configured phenylalanine derivative bearing a para-bromine substituent on the aromatic side chain. The molecule combines a chiral α-carbon with a benzyl aromatic ring that contains an electrophilic aryl bromide handle, while the Fmoc group masks the amino functionality for orthogonal peptide coupling workflows. The presence of the aryl bromide enables cross-coupling and other halogen-directed transformations without altering the protected amine, supporting downstream conversion into diversified aromatic motifs. The overall structure functions as a stable chiral amino acid intermediate and peptide building block whose stereochemistry and protected N-terminus can be carried into peptide and peptidomimetic synthesis.

1. Peptide Synthesis

Fmoc-4-Bromo-D-Phenylalanin is used in peptide building workflows where the Fmoc-protected amine supports standard N-Fmoc deprotection and subsequent amide bond formation at the α-carboxyl group. The D-configuration provides stereochemical control for incorporating the chiral residue into peptide sequences, including frameworks that require non-proteinogenic stereochemistry for conformational bias. The para-brominated phenyl side chain can be retained through peptide assembly and later transformed to introduce aryl substituents via coupling chemistry, enabling late-stage side-chain diversification. The resulting brominated peptide analogs can be applied in structure-activity relationship studies and scaffold generation for medicinal chemistry programs that rely on controlled aromatic substitution patterns.

2. Side-Chain Functionalization

Fmoc-4-Bromo-D-Phenylalanin is suitable for side-chain functionalization strategies that leverage the aryl bromide as a reactive synthetic handle. The protected amino acid format allows the molecule to be carried through peptide coupling or intermediate preparation while preserving the bromine for subsequent derivatization such as aryl-aryl bond formation or heteroaryl installation. The para position on the phenyl ring provides a defined substitution site that can be used to tune sterics and electronics in downstream analogs. The ability to convert the brominated aromatic residue into substituted phenyl or heteroaryl motifs makes this compound relevant to peptidomimetic construction and chemical biology probes requiring controlled aromatic substitution.

3. Chiral Building Block Development

Fmoc-4-Bromo-D-Phenylalanin is applied as a chiral amino acid intermediate for stereoselective synthesis planning and non-natural residue incorporation. The D-configuration at the α-carbon is preserved by the Fmoc protection strategy, enabling reproducible incorporation into peptide building blocks and minimization of stereochemical scrambling during protected-amino handling. The combination of an Fmoc-protected N-terminus and an unprotected aromatic bromide handle supports orthogonal functional group management, where peptide-compatible chemistry can proceed without consuming the side-chain electrophile. The resulting chiral intermediate can be employed to prepare libraries of D-amino acid-containing analogs for SAR studies, fragment elaboration, and stereochemical mapping in synthetic organic chemistry.

4. Bioconjugation Chemistry

Fmoc-4-Bromo-D-Phenylalanin can serve as a precursor for bioconjugation workflows that require controlled aromatic reactivity after peptide or linker assembly. The aryl bromide functionality enables subsequent coupling to install functional groups that may be needed for conjugation handles, such as arylated linkers or customized aromatic moieties that improve binding or stability in biomolecule-targeting constructs. The Fmoc-protected amino acid format supports incorporation into peptide tags or linker peptides, allowing the conjugation chemistry to be positioned at a defined residue within a larger scaffold. The stereodefined D-amino acid character can contribute to resistance against proteolysis in peptide-based conjugates, supporting the generation of stable biomolecule labeling reagents and chemical biology tools.

5. Pharmaceutical Manufacturing

Fmoc-4-Bromo-D-Phenylalanin is relevant to pharmaceutical intermediate preparation where protected amino acid building blocks are manufactured and then converted into defined peptide fragments or peptidomimetic intermediates. The Fmoc protecting group enables process-compatible handling of the amino functionality, while the carboxyl functionality supports conversion into activated coupling forms during peptide fragment assembly. The para-brominated aromatic side chain can be carried through manufacturing steps as a protected intermediate and later transformed into substituted aromatic variants needed for final API-related analogs or process-specific impurity management. The chiral, protected amino acid structure aligns with industrial synthesis routes that require stereochemical fidelity, orthogonal functional group control, and downstream derivatization capability for fine chemical production.

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