N-Me-D-His-OH · HCl

N-Me-D-His-OH · HCl is a hydrochloride salt of an N-methylated D-histidine amino acid, featuring a stereogenic center at the α-carbon and an imidazole side chain that can participate in acid-base equilibria and coordination chemistry. The N-methylation modifies the backbone amide-forming reactivity and can influence peptide coupling behavior by reducing the availability of the terminal nitrogen for standard protection/deprotection logic. The histidine imidazole ring provides a chemically addressable functionality for derivatization, metal-binding studies, and pH-responsive interactions, while the carboxylic acid enables conversion to activated esters and peptide-grade intermediates. Salt formation with HCl improves handling and defines a defined protonation state that can be leveraged in chiral building block synthesis and downstream coupling chemistry.

1. Peptide Synthesis

N-Me-D-His-OH · HCl supports peptide building block preparation and coupling chemistry for D-histidine-containing sequences where stereochemical inversion relative to L-histidine is required. The carboxylic acid can be converted into peptide-compatible activated derivatives, while the N-methylated backbone constrains amide formation geometry and can be used to tune conformational preferences in peptide analogs. The imidazole side chain can be protected during assembly and later deprotected to restore histidine functionality for subsequent functional studies. Incorporation of the D-configured, N-methylated histidine residue enables construction of stereochemically defined peptide fragments, including peptidomimetics and protease-resistant motifs.

2. Chiral Amino Acid Intermediate

N-Me-D-His-OH · HCl functions as a chiral amino acid intermediate for stereoselective synthesis routes that require a D-configured histidine derivative with a controlled, N-methylated backbone. The defined stereochemistry at the α-carbon allows downstream derivatization to proceed with predictable stereochemical outcomes in fragment coupling and side-chain functional transformations. The N-methyl group can be used to manage backbone reactivity during intermediate preparation, including selection of orthogonal protection strategies for the imidazole and carboxyl groups. The hydrochloride form can be leveraged to standardize salt handling in process chemistry intermediate workflows and to maintain reproducible protonation behavior during conversion to activated coupling partners.

3. Chemical Biology And Labeling

N-Me-D-His-OH · HCl is suitable for chemical biology research where histidine-like coordination and pH-dependent behavior are used to probe molecular recognition, binding interfaces, or metal-mediated assembly. The imidazole side chain can be functionalized to introduce clickable handles, affinity tags, or spectroscopic probes while retaining the residue's ability to participate in coordination or hydrogen-bonding networks. The D-configuration and N-methylated backbone can help modulate proteolytic stability and conformational sampling in labeled peptides and biomolecule conjugates. The resulting derivatives can serve as biochemical research intermediates for studying receptor-ligand interactions, enzyme active-site recognition, or structure-function relationships in histidine-dependent systems.

4. Peptidomimetics And SAR Studies

N-Me-D-His-OH · HCl can be applied in peptidomimetic construction and structure-activity relationship studies that require controlled backbone N-methylation and stereodefined histidine incorporation. The N-methylated amino acid residue influences amide bond polarity and local conformational preferences, while the imidazole side chain provides a functional group for interaction mapping with binding pockets. Side-chain derivatization and controlled deprotection strategies allow generation of analog series where imidazole protonation state and metal-binding capacity are systematically varied. Downstream, the compound supports synthesis of peptide analog libraries used for SAR investigations and for designing stereochemically tuned molecular scaffolds.

5. Pharmaceutical Manufacturing Intermediate

N-Me-D-His-OH · HCl is relevant to pharmaceutical manufacturing and fine chemical synthesis as a defined amino acid building block for producing peptide-like intermediates in controlled synthesis campaigns. The carboxylic acid functionality enables conversion to activated forms compatible with peptide coupling steps used in manufacturing-scale workflows, while the N-methylated backbone supports preparation of analogs with constrained conformational freedom. The imidazole side chain can be managed through protection-group strategies during assembly and then unmasked to generate the intended functional residue for further transformations. The hydrochloride salt form supports practical handling as a chiral intermediate in industrial chemical production where reproducible salt behavior and defined protonation can be important for consistent downstream processing.

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