Boc-3,5-dibromo-Tyr-OH is a protected tyrosine derivative in which the amino group of a 3,5-dibrominated aromatic amino acid is masked as a Boc carbamate, while the carboxyl group remains in the free acid form. The side chain retains the phenolic hydroxyl of the tyrosine scaffold and bears bromine substituents at the 3- and 5-positions, creating a halogenated, electron-withdrawing aromatic environment that can influence reactivity and labeling behavior. This Boc-protected amino acid is used as a building block for stepwise peptide synthesis and for preparing halogenated peptide analogues or bioconjugation reagents where the dibromo-phenyl motif provides a chemically distinct handle for structure-activity studies and analytical method development.
Boc-3,5-dibromo-Tyr-OH is a Boc-protected tyrosine derivative bearing two bromine atoms on the aromatic ring, providing a halogenated phenolic side chain suitable for downstream peptide assembly and electrophile/halogen-driven chemistry. The Boc group on the amino functionality supports use as a protected amino acid building block in protected-residue workflows, while the 3,5-dibromo substitution pattern is commonly leveraged to introduce distinct isotopic/elemental signatures and to tune reactivity and labeling strategies in chemical biology and analytical development.
1. Protected Peptide Building Block
Boc-3,5-dibromo-Tyr-OH is used as an amino acid building block for constructing tyrosine-containing peptides where a Boc-protected residue is required for controlled coupling and subsequent deprotection steps in peptide synthesis workflows. Research groups and custom peptide manufacturers select the 3,5-dibromo substitution pattern to introduce a chemically distinctive aromatic motif that can be tracked by elemental analysis or mass spectrometry, and to support downstream derivatization strategies that depend on the halogenated ring. This reagent is particularly relevant for preparing peptide segments that will later be modified at the tyrosine position or used as reference materials in analytical method development.
2. Halogen-Tagged Peptide Probes
Boc-3,5-dibromo-Tyr-OH is frequently incorporated into peptide probes and chemical biology reagents where the dibrominated aromatic ring provides a strong "tag" for detection and differentiation in complex mixtures. Chemical biology teams use these halogenated tyrosine-containing peptides to build probe libraries for studying peptide interactions, mapping binding or processing events, and generating standards for LC-MS workflows where the bromine pattern yields a characteristic mass signature. The Boc-protected form supports consistent incorporation during peptide synthesis, enabling researchers to produce probe-grade materials with defined residue composition for downstream labeling, affinity experiments, or analytical characterization.
3. Pharmaceutical Intermediate Development
Boc-3,5-dibromo-Tyr-OH is also used as a protected amino acid intermediate in medicinal chemistry and pharmaceutical intermediate development programs that require a halogenated tyrosine motif for structure-activity relationship studies and analog synthesis. Process and R&D chemists value the defined substitution pattern on the phenyl ring because it can serve as a handle for later functional group transformations or for preparing defined analog sets with controlled aromatic electronics and sterics. The protected amino functionality helps integrate the building block into multi-step synthesis sequences that ultimately generate tyrosine-derived fragments, peptide-like scaffolds, or related aromatic intermediates used in lead optimization chemistry.
4. Analytical Standards And Tracers
Boc-3,5-dibromo-Tyr-OH is applied to prepare analytical standards and reference peptides that require robust elemental and mass spectral discrimination. Analytical method developers and proteomics/metabolomics workflow teams use dibrominated tyrosine-containing constructs to create calibration or qualification materials that show clear bromine-associated isotopic patterns, improving traceability in LC-MS-based quantitation and identification workflows. By starting from a protected, well-defined amino acid building block, researchers can generate repeatable peptide standards with consistent residue composition for instrument tuning, method validation, and comparative studies across batches.
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