H-Arg(Me)-OH · HCl

H-Arg(Me)-OH · HCl is a hydrochloride salt form of an arginine-derived amino acid featuring a guanidinium-containing side chain with a methyl substituent on the α-amino framework (N-methylated arginine analog) and a free carboxylic acid, giving a strongly basic, proton-stabilized functionality under typical peptide-synthesis conditions. The salt state increases aqueous handling and ensures the guanidine moiety remains positively charged, which influences coupling selectivity, solubility, and chromatographic behavior of intermediates. The presence of a single stereogenic center at the α-carbon supports use as a chiral building block for stereochemically defined peptide fragments and downstream derivatization. The combination of a protected-or-unprotected amino acid core with a salt-stabilized side-chain functionality makes the compound a practical intermediate for peptide coupling chemistry, amino acid modification, and synthetic method development.

1. Protected Amino Acids

H-Arg(Me)-OH · HCl serves as a chiral precursor for preparing protected arginine analog building blocks used in peptide synthesis workflows. The free α-carboxylic acid and protonated guanidinium group enable conversion into coupling-ready derivatives such as activated esters or protected amino acid forms, while the N-methyl substitution can be leveraged to control amide bond formation patterns and minimize undesired side reactions associated with strongly basic residues. Salt-associated protonation supports handling during derivatization steps and can be managed through base-mediated deprotonation to tune reactivity toward peptide coupling reagents. Downstream protected amino acid synthesis from this hydrochloride salt supports consistent fragment assembly in solid-phase or solution-phase peptide construction and provides a defined stereochemical input for arginine-containing sequences.

2. Peptide Synthesis

H-Arg(Me)-OH · HCl functions as an arginine-derived residue source for constructing peptides and peptidomimetics where a guanidinium-bearing side chain is required for ionic recognition. The methyl-substituted arginine framework provides a distinct side-chain steric and electronic profile compared with canonical arginine, which can be incorporated into peptide coupling chemistry to probe sequence-dependent conformational effects and backbone-side-chain interactions. The carboxylic acid and amino functionality allow formation of amide linkages using standard coupling strategies after appropriate protection and activation of the functional groups to manage the strongly basic guanidine during chain elongation. Resulting peptide analogs can be used to generate residue-specific libraries, support SAR studies, and produce defined peptide fragments for biochemical assays and materials-oriented peptide scaffolds.

3. Chemical Biology Conjugation

H-Arg(Me)-OH · HCl can be applied in chemical biology workflows that require guanidinium-rich motifs for biomolecule binding, uptake, or affinity-based capture. The guanidinium side chain, retained in a protonated state as the hydrochloride salt, can participate in ionic interactions and can be chemically transformed into conjugation handles through derivatization of the amino acid core or side-chain-proximal functional groups. The α-amino acid framework supports installation into linkers, tags, or reactive intermediates that enable coupling to activated esters, isothiocyanates, maleimides, or other electrophiles after conversion to suitably protected or activated derivatives. Downstream conjugate formation from this chiral arginine analog supports biomolecule labeling, affinity reagent construction, and analytical probe development where charge density and stereochemical definition matter.

4. Peptidomimetics And SAR Studies

H-Arg(Me)-OH · HCl is suitable for building peptidomimetic scaffolds that emulate arginine-like binding while modulating hydrogen-bonding geometry and steric environment via the N-methylated α-amino framework. The guanidinium functionality provides a recognizable cationic interaction element for structure-activity relationship studies, while the methyl substitution can influence local conformational preferences and amide rotational freedom in the resulting analogs. Incorporation into peptide-like backbones enables systematic evaluation of how residue electronics and sterics affect target binding interfaces, including studies that rely on defined stereochemistry to interpret structure-function relationships. Synthetic derivatives prepared from this amino acid intermediate can feed fragment-based design campaigns and generate stereochemically consistent analog sets for medicinal chemistry and biochemical research.

5. Process Chemistry Intermediate

H-Arg(Me)-OH · HCl can be used as a manufacturing-relevant intermediate for producing N-methylated arginine derivatives and downstream fine chemical building blocks. The hydrochloride salt form improves handling of the basic guanidinium side chain during scale-up operations and supports controlled conversion into activated or protected forms used in peptide-grade intermediate supply chains. The stable α-amino acid functionality allows integration into process chemistry routes for generating coupling partners, reagent-grade amino acid derivatives, and chiral intermediates for specialty synthesis. Downstream utilization includes preparation of peptide synthesis inputs and industrial intermediate production where consistent stereochemical identity and predictable salt-to-free-base behavior support robust manufacturing and analytical traceability.

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