Fmoc-3,5-Dibromo-D-tyrosine

Fmoc-3,5-Dibromo-D-tyrosine is an Fmoc-protected D-tyrosine derivative bearing two bromine atoms on the aromatic ring at the 3,5-positions, creating a halogenated phenolic side chain that retains an ortho-disubstituted substitution pattern relative to the hydroxyl group. The molecule combines an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group for orthogonally controlled amine deprotection with a chiral amino acid backbone, enabling stereochemically defined peptide coupling. The phenolic hydroxyl and the aryl bromides provide distinct reactivity handles for selective functional group transformations, including O-protection/deprotection strategies and halogen-directed cross-coupling chemistry. The halogenation pattern can influence electronic properties and downstream labeling or scaffold diversification, making the compound a practical chiral building block for peptide synthesis and derivatization workflows.

1. Peptide Synthesis

Fmoc-3,5-Dibromo-D-tyrosine is used in peptide building block preparation for solid-phase peptide synthesis where the Fmoc group supports controlled N-terminal deprotection and subsequent amide bond formation. The D-tyrosine stereocenter and the ortho-disubstituted, brominated aromatic side chain allow incorporation of a defined chiral residue into peptide sequences for structure-encoded studies and peptide analog construction. The phenolic hydroxyl can be managed through compatible protection strategies during coupling, while the aryl bromides remain available for post-assembly diversification. The resulting brominated peptide products can serve as intermediates for further derivatization, including cross-coupling to install aryl substituents or to tune hydrophobicity and electronic character in peptidomimetic scaffolds.

2. Peptidomimetics And SAR

Fmoc-3,5-Dibromo-D-tyrosine is applied in medicinal chemistry research focused on peptidomimetic construction and structure-activity relationship studies where halogenated aromatic residues act as tunable pharmacophore elements. The 3,5-dibromo substitution pattern on the tyrosine ring provides two chemically addressable sites for subsequent functionalization, enabling systematic variation of aromatic substitution patterns without altering the amino acid backbone geometry. The Fmoc-protected amine supports rapid generation of analog libraries via iterative peptide coupling, while the D-configuration can be used to probe stereochemical effects on binding conformations and resistance to proteolysis in non-clinical assay contexts. Downstream transformations can convert the bromides into aryl or heteroaryl substituents, supporting fragment-like diversification on peptide-derived scaffolds.

3. Chemical Biology Labeling

Fmoc-3,5-Dibromo-D-tyrosine is suitable for chemical biology workflows that require site-specific aromatic handles for conjugation or reporter installation. The phenolic hydroxyl provides a functional group that can be protected or derivatized to control chemoselectivity, while the two aryl bromides enable coupling reactions to append tags, linkers, or recognition motifs onto tyrosine-containing biomolecule fragments. The Fmoc-protected form facilitates incorporation into peptide probes, enabling construction of defined labeling peptides with a stereochemically controlled residue. Halogen-directed functionalization supports downstream generation of conjugates for mechanistic studies, binding assays, and biomolecular interaction mapping using amino acid-based reporter scaffolds.

4. Bioconjugation Chemistry

Fmoc-3,5-Dibromo-D-tyrosine is employed as an amino acid intermediate for bioconjugation chemistry where aromatic halogens serve as reactive sites for late-stage coupling onto peptide or protein fragments. The protected N-terminus enables sequential assembly of conjugatable peptides, and the D-tyrosine configuration can be used to control stereochemical presentation of the phenolic side chain within the final conjugate. The brominated aromatic ring can undergo halogen-to-substituent conversion to introduce solubilizing groups, affinity handles, or orthogonal reactive groups compatible with conjugation strategies. The resulting conjugation-ready peptides function as intermediates for constructing labeled biomolecules, immobilized affinity ligands, and modular chemical probes used in biochemical research and applied assay development.

5. Process Chemistry Intermediate

Fmoc-3,5-Dibromo-D-tyrosine is relevant to process chemistry and fine chemical synthesis where robust protection-group logic supports scalable preparation of halogenated amino acid derivatives. The Fmoc group provides a stable N-protection handle during storage and handling, while its deprotection compatibility with standard peptide synthesis conditions supports manufacturing route design for peptide building block production. The presence of bromine substituents and a phenolic hydroxyl enables controlled downstream conversion to alternative arylated derivatives through halogen-directed transformations, supporting flexible intermediate generation for specialty chemical production. The chiral D-tyrosine backbone supports stereospecific incorporation into downstream products, aligning with industrial needs for defined stereochemistry in peptide-derived materials and research-grade chemical intermediates.

6. Analytical Research Standards

Fmoc-3,5-Dibromo-D-tyrosine is used in analytical research settings to prepare reference compounds and method-development standards for monitoring peptide synthesis, derivatization, and purification. The combination of Fmoc protection, a chiral D-tyrosine backbone, and the distinctive 3,5-dibromo aromatic pattern provides characteristic mass and fragmentation behavior that can assist LC-MS or MS/MS identification of tyrosine-containing residues and their substituted analogs. The phenolic hydroxyl and aryl bromides enable conversion into chemically related standards, supporting method validation across multiple derivatization states. The compound therefore functions as an amino acid-based intermediate for analytical characterization workflows that track coupling efficiency, side-chain modifications, and identity of peptide building blocks and final peptide products.

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