N-Me-His-OMe · HCl

N-Me-His-OMe · HCl is a hydrochloride salt form of an N-methylated histidine methyl ester, combining an imidazole-containing side chain with a protected-like amino acid functionality where the α-amino group is blocked as an N-methyl amide and the carboxylate is present as a methyl ester. The histidine imidazole ring provides pH-dependent nucleophilicity and can participate in coordination, hydrogen bonding, and selective derivatization chemistry, while the ester group enables downstream conversion to amides or acids under controlled conditions. The chiral center inherent to the histidine backbone supports stereochemically defined incorporation into peptide-related intermediates, and the HCl salt form improves handling by mitigating free-base basicity and promoting water-compatible salt formation. As a compact protected amino acid derivative, N-Me-His-OMe · HCl functions as a chiral building block for constructing histidine-containing sequences and for preparing functionalized histidine analogs used in biochemical and process-oriented synthesis.

1. Peptide Synthesis

N-Me-His-OMe · HCl supports peptide coupling workflows where histidine residues are required with a defined side-chain imidazole functionality. The N-methylated α-amino component and the methyl ester motif allow controlled transformation into peptide-ready derivatives, enabling conversion toward amide-forming partners while preserving the imidazole for subsequent side-chain chemistry. Salt-state handling can improve reproducibility during reagent preparation and intermediate isolation steps in peptide building block preparation. Histidine-containing peptides and peptidomimetic fragments generated from this amino acid ester can be used to probe sequence-dependent properties and to support synthetic libraries in amino acid chemistry.

2. Chemical Biology Probes

N-Me-His-OMe · HCl is suitable for chemical biology research targeting imidazole-mediated recognition and coordination phenomena. The histidine imidazole ring can be leveraged for designing probes that undergo selective derivatization or participate in metal binding motifs, while the ester and N-methyl features can tune reactivity toward conjugation handles and stability in labeling workflows. Hydrochloride salt formation helps maintain a controlled protonation state of the basic imidazole during early-stage synthesis and intermediate handling. Downstream conversion to amide or acid derivatives can enable incorporation into affinity tags, enzyme-interaction studies, or biomolecule-modifying reagents used to interrogate histidine-dependent binding modes.

3. Bioconjugation Chemistry

N-Me-His-OMe · HCl can be employed in bioconjugation strategies where an amino acid-derived fragment bearing a reactive imidazole is needed for linker construction. The methyl ester functionality serves as a synthetic handle for transforming the carboxyl group into activated acyl forms or into stable amide linkages that connect to proteins, peptides, or polymer backbones. The N-methylated α-amino group reduces competing α-amino reactivity, which can help direct coupling chemistry toward the intended acylation or side-chain functionalization steps. Resulting histidine-containing conjugates can be used to generate labeled biomolecules for analytical research and for mapping molecular interactions that depend on imidazole chemistry.

4. Peptidomimetics And SAR

N-Me-His-OMe · HCl enables peptidomimetic construction for structure-activity relationship studies focused on histidine side-chain contributions. The imidazole ring provides a stereochemically consistent functional group that can be retained, masked, or chemically modified to tune hydrogen-bonding and coordination behavior in analog scaffolds. The amino acid ester and N-methyl architecture support iterative derivatization toward analogs with altered backbone amide character and controlled conformational preferences. Histidine-containing mimetics prepared from this chiral intermediate can be applied in SAR workflows and fragment-based design campaigns to evaluate how imidazole presentation affects molecular recognition.

5. Process Chemistry Intermediate

N-Me-His-OMe · HCl is applicable as a manufacturing-oriented chiral intermediate for producing histidine-containing building blocks and downstream acyl derivatives. The combination of an amino acid ester and a side-chain imidazole enables predictable functional group interconversions, including conversion of the ester into amide-forming intermediates and subsequent coupling into larger synthetic targets. Hydrochloride salt handling can support consistent material transfer, storage, and controlled protonation behavior during scale-up-compatible synthesis planning. Produced intermediates derived from N-Me-His-OMe · HCl can feed into fine chemical synthesis routes that require stereodefined histidine fragments for peptide chemistry, specialty reagents, and industrial-scale preparation of amino acid-based compounds.

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