H-His(1-Me)-OMe

H-His(1-Me)-OMe is a methylated histidine derivative presented as a methyl ester, bearing an imidazole-containing side chain and a stereodefinable amino acid backbone with N-substitution at the imidazole-proximal position. The structure combines an imidazole ring capable of protonation-state switching with an amino group that is present as a free N-terminus (H-) and a carboxyl functionality masked as a methoxy ester (OMe), which alters both nucleophilicity and peptide-coupling behavior compared with the corresponding free acid. The N-methylation at the 1-position of the imidazole modifies hydrogen-bonding patterns and can influence regioselective interactions in receptor-binding and enzyme-active-site studies. As a chiral amino acid ester, H-His(1-Me)-OMe can function as a protected/activated histidine-related intermediate for downstream conversion to amides, peptide building blocks, and side-chain-functionalized analogs.

1. Peptide Synthesis

H-His(1-Me)-OMe supports peptide coupling workflows where histidine-like residues are required with an N-methylated imidazole side chain, because the amino terminus can participate in amide bond formation after conversion to an appropriate activated form. The methyl ester (OMe) provides a controllable carboxyl surrogate for stepwise assembly, while the substituted imidazole can reduce undesired side reactions during coupling and can tune the local basicity of the residue in the growing peptide. Ester-to-amide derivatization enables incorporation into short peptides and protected peptide fragments used in library synthesis and method development. The resulting histidine analogs can be carried into peptide science as intermediates for further N- or C-terminal modifications and for evaluating how imidazole substitution affects sequence-dependent properties.

2. Chemical Biology

H-His(1-Me)-OMe is applicable to chemical biology research that requires histidine-mimetic residues with altered protonation behavior, since the 1-methyl imidazole can modulate hydrogen-bonding and metal-binding motifs relative to canonical histidine. The free N-terminus and ester functionality enable controlled conversion into amide-linked probes or conjugation-ready fragments, supporting studies of molecular recognition, binding-site microenvironment, and protein-ligand interactions. The imidazole ring's pH-dependent character can be exploited in designing probes that report or perturb local electrostatics in biochemical assays. Downstream transformation of the ester into stable linkages supports generation of labeled analogs and structure-activity relationship (SAR) materials for mechanistic investigations.

3. Side-Chain Functionalization

H-His(1-Me)-OMe is suitable for side-chain functionalization strategies where the imidazole scaffold is retained but reactivity and binding geometry are tuned through N-methyl substitution. The amino acid ester format facilitates derivatization at the backbone carboxyl position during intermediate construction, while the imidazole can serve as a handle for subsequent modifications such as coordination chemistry, nucleophilic substitution on adjacent functional groups after appropriate activation, or incorporation into peptidomimetic frameworks. The stereodefinable backbone helps maintain consistent spatial presentation of the substituted imidazole in downstream analogs. The resulting functionalized amino acid derivatives can be used to build peptide analogs and small-molecule fragments for studying recognition elements and for generating chemical probes with defined side-chain electronics.

4. Protected Amino Acid Chemistry

H-His(1-Me)-OMe functions as a chiral amino acid ester intermediate in protected amino acid synthesis sequences, where ester masking of the carboxyl group supports controlled handling during multi-step assembly. The N-substituted imidazole and the ester group together provide a practical platform for orthogonal protection planning, enabling selective conversion to amides or further elaboration while maintaining the integrity of the imidazole substitution pattern. The free amino functionality allows incorporation into coupling strategies after activation of the carboxyl component or after conversion to a carboxyl-reactive derivative. Downstream, the compound can be used to prepare histidine-derived building blocks for peptide construction, fragment ligation, and intermediate supply in fine chemical synthesis.

5. Pharmaceutical Intermediate Preparation

H-His(1-Me)-OMe can be employed in pharmaceutical intermediate preparation where histidine-like motifs are required in peptidomimetic or constrained scaffold designs, particularly when modulation of imidazole basicity and hydrogen-bonding is desired. The amino acid ester form supports stepwise synthetic routes that convert the carboxyl functionality into amide-linked pharmacophore elements, while the 1-methyl imidazole can influence conformational preferences and interaction patterns in bioactive lead series. The chiral backbone enables consistent stereochemical outcomes in downstream assembly of analogs used for SAR studies and medicinal chemistry optimization. The compound's structure aligns with industrial fine chemical synthesis needs for reproducible intermediate generation and subsequent functional group interconversions into drug-like fragments.

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