N-Me-His-OH · HCl

N-Me-His-OH · HCl is a hydrochloride salt of N-methylated histidine, retaining the imidazole side chain and the α-carboxylic acid while featuring an N-methylated α-amino functionality that alters peptide coupling behavior relative to canonical histidine. The imidazole ring provides pH-dependent basicity and coordination capacity, enabling metal-binding motifs and site-specific reactivity in biochemical and synthetic studies. The salt form improves handling of the amino acid as a chiral, polar building block while maintaining the stereochemical integrity at the α-center for downstream incorporation. The combination of an imidazole side chain and a carboxylic acid makes N-Me-His-OH · HCl a practical intermediate for amino acid derivatization, protected amino acid synthesis, and controlled generation of histidine-containing peptide analogs.

1. Peptide Synthesis

N-Me-His-OH · HCl supports peptide coupling workflows where N-methylation is used to modulate backbone hydrogen-bonding and proteolytic stability in peptide science. The compound's imidazole side chain can participate in orthogonal protection strategies for histidine-like residues, while the free carboxylic acid enables formation of activated esters or amide coupling partners after appropriate conversion to a protected or activated derivative. N-methylation changes the nucleophilicity of the amino nitrogen, so peptide assembly typically relies on converting the carboxyl group to a coupling-ready form while managing the imidazole with suitable protection or selective deprotection logic. Incorporation of this chiral amino acid derivative into peptide sequences can generate N-methyl histidine motifs for mechanistic studies and peptidomimetic construction, aligning with standard amino acid chemistry practices.

2. Chemical Biology Probes

N-Me-His-OH · HCl is suitable for chemical biology research requiring histidine-like coordination chemistry and pH-responsive behavior from the imidazole side chain. The salt-stabilized amino acid framework facilitates controlled derivatization into conjugation-ready intermediates, while the imidazole can serve as a functional handle for metal-chelation probes, affinity tags, or binding-site mimicry. N-methylation can tune conformational preferences and reduce amide NH participation, which can be relevant when designing probes that probe local microenvironments or receptor-like binding pockets. Downstream labeling reagents and biochemical research intermediates derived from N-Me-His-OH · HCl can be used to build molecular recognition tools that rely on amino acid side-chain chemistry rather than only backbone composition.

3. Protein Engineering

N-Me-His-OH · HCl can be applied in protein engineering contexts where incorporation of N-methylated histidine analogs is used to probe structure-function relationships and local hydrogen-bond networks. The preserved imidazole moiety enables retention of histidine-like metal coordination and protonation-dependent interactions, while the N-methylated α-amino group changes backbone donor/acceptor patterns that influence folding and binding interfaces. The hydrochloride salt form supports reproducible handling when preparing protected amino acid derivatives for stepwise assembly or for incorporation into peptide-based protein mimics. Resulting N-methyl histidine-containing constructs can serve as biochemical research materials for mapping interaction sites, improving interpretability of residue-level modifications, and generating protein analogs compatible with peptide-scaffold workflows.

4. Side-Chain Functionalization

N-Me-His-OH · HCl is relevant to side-chain functionalization strategies that exploit the imidazole ring for targeted chemical transformations. The compound's imidazole can be selectively protected during multi-step synthesis, then deprotected to enable conjugation, crosslinking, or coordination-based attachment to surfaces, nanoparticles, or chelating ligands. The α-carboxylic acid provides a second reactive locus for conversion into amide or ester derivatives, allowing orthogonal attachment schemes that separate backbone linkage from side-chain modification. Synthetic routes that begin with N-Me-His-OH · HCl can generate functionalized amino acid intermediates used in peptidomimetics, affinity ligands, and binding-site scaffolds where imidazole chemistry is central to the final molecular function.

5. Pharmaceutical Intermediate Preparation

N-Me-His-OH · HCl can serve as a chiral amino acid intermediate for manufacturing-oriented synthesis of N-methyl histidine-containing building blocks used in drug discovery programs and medicinal chemistry libraries. The combination of a protected/derivatizable carboxylic acid and an imidazole side chain enables downstream conversion into protected amino acid derivatives, coupling partners, and specification-grade intermediates for peptide-like active candidates. Salt formation supports consistent material handling and can be leveraged when designing process chemistry routes that require stable, isolable amino acid starting materials. Prepared derivatives derived from N-Me-His-OH · HCl can feed into fine chemical synthesis steps that construct amide-rich frameworks and peptidomimetic scaffolds with controlled stereochemistry and side-chain functionality.

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