H-D-MeAla-OH*HCl

H-D-MeAla-OH*HCl is a hydrochloride salt form of N-unsubstituted, deuterium-labeled alanine derivative bearing a methyl-substituted amino acid framework (D-MeAla) with a free carboxylic acid and an N-H functionality. The molecule contains a chiral center at the amino acid carbon, and the deuterium incorporation enables isotopic tracking while preserving the stereochemical identity relevant to alanine-like residue recognition. The carboxylic acid can participate in standard amino acid coupling chemistry, whereas the amino group can be temporarily masked with common peptide-protecting groups to control reactivity during stepwise synthesis. Salt formation with HCl improves handling of the amino acid hydrochloride in synthesis and analytical workflows, while the small, aliphatic side chain supports incorporation into peptide sequences and downstream derivatization.

1. Isotope-Labeled Peptide Synthesis

H-D-MeAla-OH*HCl is applied in peptide synthesis workflows that require deuterium labeling for MS-based quantitation and mechanistic studies. The amino acid ester or protected acid forms derived from this deuterated alanine can undergo peptide coupling through standard amide bond-forming strategies after appropriate N-protection and activation of the carboxyl group. The small aliphatic side chain and stereogenic center support clean incorporation at alanine positions within peptides, enabling residue-specific mass shifts without introducing bulky functional groups. Deuterium retention through coupling and deprotection steps supports downstream peptide analog construction, isotope dilution experiments, and comparative studies of peptide stability and fragmentation patterns.

2. Chemical Biology Tracer Chemistry

H-D-MeAla-OH*HCl serves as a chemically defined isotope tracer for chemical biology research targeting amino acid metabolism, peptide turnover, and labeling-based detection. The deuterated alanine motif can be incorporated into peptide substrates or probe scaffolds where the amino acid backbone governs recognition by enzymes and binding partners. The carboxylic acid and amino functionality allow conversion into protected intermediates for controlled conjugation or for generation of labeled building blocks used in cell-free or in vitro biochemical assays. Isotopic substitution supports tracking of incorporation, exchange, and degradation pathways by mass spectrometry, while the hydrochloride salt form supports reproducible intermediate preparation for tracer studies.

3. Protected Amino Acid Intermediate

H-D-MeAla-OH*HCl is suitable for protected amino acid synthesis routes that require a deuterated chiral building block compatible with peptide coupling cycles. The free carboxylic acid enables formation of activated derivatives or ester intermediates, while the amino group can be protected with acid-stable or orthogonally removable groups to tune chemoselectivity during multi-step assembly. The stereochemical integrity of the D-MeAla residue supports stereocontrolled incorporation into peptide chains where epimerization control is required. Downstream deprotection and coupling compatibility allows preparation of labeled peptide fragments for combinatorial library construction, SAR-focused analog generation, and isotope-resolved structure elucidation.

4. Enzyme Substrate And Inhibitor Design

H-D-MeAla-OH*HCl is used in enzyme studies where alanine-like residues are embedded in substrates or inhibitor scaffolds to probe catalytic specificity and kinetic isotope effects. The amino acid backbone supports incorporation into peptidic or peptidomimetic constructs via amide linkages, while the deuterium label can be positioned to influence vibrational properties relevant to mechanistic interpretation. The hydrochloride salt form can facilitate reproducible conversion into N-protected, carboxyl-activated intermediates for scaffold assembly under controlled synthetic conditions. Labeled substrates generated from this compound can support structure-function investigations, mapping of cleavage sites, and comparative analyses of enzyme processing across residue variants.

5. Analytical Method Development

H-D-MeAla-OH*HCl functions as an analytical reference material precursor for developing deuterium-resolved quantitation methods for amino acid and peptide workflows. The deuterated stereochemical framework and carboxylic acid enable preparation of labeled standards that behave similarly to native residues during derivatization and chromatographic separation. Conversion to protected forms and subsequent deprotection can generate isotope-matched peptide standards for calibration, retention-time confirmation, and fragmentation pattern benchmarking in LC-MS/MS. The salt form supports consistent handling and can streamline preparation of isotope-labeled internal standards used in method validation and routine analytical monitoring of peptide synthesis or degradation products.

6. Pharmaceutical Intermediate Preparation

H-D-MeAla-OH*HCl is applicable to industrial fine chemical synthesis as a deuterated chiral amino acid intermediate for labeled peptidic intermediates and process development studies. The amino acid functionality enables integration into manufacturing routes for protected amino acid derivatives, including N-protected intermediates and activated carboxyl derivatives used in stepwise assembly. Deuterium labeling supports downstream analytical tracking of intermediates, impurity profiling, and route scouting where isotope-resolved measurements help distinguish closely related species. The small alanine-like structure supports scalable peptide-building-block preparation, enabling incorporation into labeled reference materials, process monitoring reagents, and deuterium-tagged scaffold intermediates for applied research and industrial chemical development.

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