Bzl-His-OMe · 2 HCl

Bzl-His-OMe · 2 HCl is a benzyl-protected histidine methyl ester hydrochloride salt in which the imidazole side chain of the histidine residue is present as a nucleophilic, pH-responsive functional group, while the α-amino functionality is protected as a benzyl (Bzl) carbamate/benzyl-protected amine derivative and the carboxyl group is masked as a methyl ester (OMe). The double hydrochloride salt form provides defined protonation states for handling and can influence solubility and imidazole reactivity during peptide coupling and side-chain transformations. The stereochemical integrity of the histidine α-center enables incorporation as a chiral amino acid building block, and the combination of protected amine plus ester functionality supports downstream conversion to amide-linked peptide bonds. The salt-stabilized, protected amino acid ester format makes it suitable as a peptide synthesis intermediate and as a chiral precursor for histidine-containing analogs where imidazole chemistry and controlled deprotection are central.

1. Peptide Synthesis

Bzl-His-OMe · 2 HCl is used in peptide coupling workflows as a protected histidine methyl ester building block, where the benzyl-protected amino group and the esterified carboxylate enable controlled formation of peptide bonds under standard amide coupling conditions. The imidazole side chain provides a functional handle that can participate in orthogonal protection strategies, allowing selective side-chain modification or preservation during chain assembly. The hydrochloride salt form can be leveraged to manage protonation during activation and coupling steps, supporting reproducible behavior in synthesis planning. Downstream, the methyl ester can be converted to carboxylic acid derivatives or directly used as a route to histidine-containing peptide segments and protected peptide intermediates for further assembly.

2. Side-Chain Functionalization

Bzl-His-OMe · 2 HCl is suitable for histidine side-chain derivatization and chemical biology probe construction because the imidazole ring can undergo targeted transformations while the α-amino and carboxyl functionalities are masked for chemoselective manipulation. Benzyl protection on the amino functionality and ester masking reduce competing reactivity, enabling selective functionalization of the imidazole through alkylation, acylation, or coordination-driven chemistry depending on the chosen conditions. The double HCl salt state can help tune imidazole protonation, which is relevant for reproducible functional group installation and for subsequent deprotection sequencing. The resulting histidine-modified intermediates can feed into peptidomimetics, enzyme substrate analogs, or molecular recognition scaffolds where imidazole identity and stereochemical context are preserved.

3. Chemical Biology Probes

Bzl-His-OMe · 2 HCl supports chemical biology research and biomolecular interaction studies by providing a protected histidine residue that can be incorporated into peptides and peptidomimetics used as binding or labeling elements. The imidazole side chain serves as a chemically addressable motif for constructing pH-sensitive or metal-interacting probes, while the protected amino/ester pattern helps maintain compatibility with peptide assembly and subsequent conjugation steps. The defined salt form facilitates handling and can improve reproducibility when generating labeled derivatives that depend on imidazole protonation behavior. Downstream utilization includes preparation of histidine-containing probe fragments for structure-activity relationship studies, receptor-binding investigations, and mechanistic assays that rely on well-defined amino acid stereochemistry.

4. Protected Amino Acid Chemistry

Bzl-His-OMe · 2 HCl is applied as a chiral protected amino acid intermediate for manufacturing-grade peptide building blocks and for synthetic route development requiring orthogonal protection logic. The benzyl-protected amino component and methyl ester masking allow staged deprotection and functional group interconversion, supporting conversion to carboxylic acid forms, activation as coupling partners, or transformation into alternative protected derivatives. The imidazole side chain remains present throughout as a reactive, stereochemically defined substituent that can be retained, protected further, or selectively modified depending on the target peptide or analog. This protection strategy aligns with peptide science workflows that require predictable reactivity profiles during intermediate preparation and downstream assembly into longer sequences.

5. Pharmaceutical Manufacturing Intermediates

Bzl-His-OMe · 2 HCl can be incorporated into industrial fine chemical synthesis for producing histidine-containing peptide intermediates used in process development for peptide-based active ingredients and research-grade reference materials. The protected amino acid ester format supports controlled chain extension steps, while the imidazole functionality enables incorporation into defined sequence contexts that may require later side-chain handling during purification or final deprotection. The hydrochloride salt form improves storage and handling consistency for scale-up logistics, and the chiral α-center ensures stereochemical fidelity across manufacturing steps. Downstream processing can convert the ester to the corresponding acid or activate it for coupling, enabling preparation of standardized intermediates for peptide manufacturing and analytical method development.

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