Boc-D-His(3-Bom)-OH is a protected, D-configured histidine amino acid derivative in which the imidazole-containing side chain of histidine bears a 3-bromomethyl (3-Bom) substituent at the 3-position. The molecule contains a Boc-protected α-amino group and a free carboxylic acid, while the substituted imidazole provides a heteroaromatic ring that can participate in acid-base behavior and the bromomethyl substituent provides a chemically addressable handle for nucleophilic substitution or further functionalization. As a stepwise peptide-synthesis intermediate, it supports controlled coupling of the protected amino acid building block and enables incorporation of a side-chain functional group for subsequent derivatization in peptide and chemical biology workflows.
Boc-D-His(3-Bom)-OH is a D-configured histidine derivative supplied as a Boc-protected amino acid building block with a substituted histidine side chain bearing a 3-bromomethyl (3-Bom) functionality. This combination of stereochemical control, N-terminal protection, and a reactive benzyl-like bromomethyl handle makes it useful for assembling modified peptide segments and for preparing side-chain-functionalized intermediates that can be carried through downstream derivatization steps.
1. Peptide Segment Building
Boc-D-His(3-Bom)-OH is used by peptide synthesis groups to introduce a D-histidine residue with a side-chain bromomethyl group into custom peptide sequences. The Boc protection supports standard amino acid coupling workflows for protected building blocks, enabling incorporation into peptide intermediates where the histidine side chain must remain available for later functionalization rather than being fully derivatized at the time of residue assembly. Research teams developing stereochemically defined peptides, including D-amino acid-containing sequences for stability-focused structure studies, rely on this reagent to maintain the D-configuration during segment construction.
2. Side-Chain Derivatization Intermediates
Boc-D-His(3-Bom)-OH serves as a practical precursor for generating histidine-based derivatives through the bromomethyl functionality on the side chain. Synthetic chemists and medicinal chemistry teams commonly use this handle to install additional substituents on the imidazole-bearing side chain after peptide assembly or at the intermediate stage, supporting workflows such as tether installation for conjugation, preparing electrophile-bearing intermediates for subsequent substitution, or generating protected/functionalized variants used in SAR campaigns. The bromomethyl group provides a direct chemical handle that can be carried into later steps without requiring redesigning the core amino acid stereochemistry.
3. Medicinal Chemistry Peptidomimetic Development
Boc-D-His(3-Bom)-OH is frequently selected in peptidomimetic and peptide-drug-adjacent development programs where D-amino acid content and side-chain functionalization are used to tune chemical properties of candidate scaffolds. Medicinal chemistry groups use the protected D-histidine building block to construct defined analogs that incorporate an electrophilic side-chain motif, supporting iterative synthesis of analog series where the side-chain substitution pattern is varied while keeping the backbone stereochemistry constant. This reagent is particularly useful when the development plan includes late-stage diversification of the histidine side chain from a bromomethyl precursor rather than introducing the final substituent during the initial residue coupling stage.
4. Chemical Biology Conjugation Precursors
Boc-D-His(3-Bom)-OH is applied as a chemical biology building block for preparing conjugation-ready peptide components and labeling intermediates that require a reactive bromomethyl group for subsequent attachment chemistry. Teams working on bioconjugate libraries or probe precursor synthesis use this reagent to generate histidine-containing constructs that can be functionalized after peptide assembly, supporting controlled installation of linkers or capture groups onto the side chain. The combination of N-terminal Boc protection and the 3-bromomethyl handle helps maintain a defined reactive site for downstream conjugation workflows while enabling D-histidine placement for stereochemical control in the resulting probes or conjugates.
2. SERS spectrum of the peptide thymosin‐β4 obtained with Ag nanorod substrate
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