H-L-MePhe-OH*HCl

H-L-MePhe-OH*HCl is the hydrochloride salt of L-2-(methyl)phenylalanine (MePhe), featuring an L-configured α-amino acid backbone with a benzyl side chain bearing a methyl substituent that modulates hydrophobicity and aromatic packing. The molecule contains a free carboxylic acid functionality and a protonated amino group under hydrochloride conditions, which improves handling and can influence coupling behavior during peptide synthesis. The stereogenic center at the α-carbon enables stereochemically defined incorporation into peptide chains and chiral SAR scaffolds, while the aromatic ring supports electrophilic substitution, halogenation, and derivatization routes used to generate analog libraries. As an amino acid building block and chiral intermediate, H-L-MePhe-OH*HCl participates in standard amino acid coupling chemistry after conversion to an activated carboxyl derivative or after orthogonal protection of the amino group.

1. Peptide Synthesis

H-L-MePhe-OH*HCl is applied in peptide building block preparation and solid-phase or solution-phase peptide coupling workflows where an L-α-amino acid with a carboxylic acid is required. The hydrochloride salt form provides a defined protonation state for amine handling, while the carboxyl group can be activated using peptide coupling reagents to form amide bonds at the desired position. The MePhe side chain contributes hydrophobic and aromatic character that can influence folding, solubility, and conformational preferences of peptide sequences. Downstream, the resulting MePhe-containing peptides can be used for structure-activity relationship studies, enzyme substrate mapping, and peptide analog construction where stereochemical fidelity at the α-center is maintained.

2. Side-Chain Functionalization

H-L-MePhe-OH*HCl supports amino acid derivatization strategies that exploit the methyl-substituted phenyl side chain for chemical modification and scaffold diversification. The aromatic ring can undergo electrophilic aromatic substitution or directed functionalization to introduce substituents that tune polarity, steric bulk, and binding interactions in peptidomimetics. The α-amino and carboxyl functionalities enable conversion into protected intermediates for selective side-chain transformations without disrupting the backbone during multi-step synthesis. The resulting functionalized amino acid derivatives can serve as intermediates for SAR studies, receptor-binding probes, and medicinal chemistry campaigns requiring controlled aromatic substitution patterns.

3. Chiral Amino Acid Intermediate

H-L-MePhe-OH*HCl is suitable for chiral synthesis and process-oriented preparation of stereodefined amino acid derivatives used across fine chemical manufacturing. The L-configuration at the α-carbon provides a stereochemically defined handle for downstream formation of N-protected amino acids, activated esters, or carboxylate derivatives compatible with peptide coupling and chiral auxiliary-free routes. The hydrochloride salt form can be leveraged to standardize feedstock handling in synthetic sequences that require consistent amine protonation prior to protection or activation steps. The compound therefore functions as a chiral amino acid intermediate for producing protected MePhe derivatives, isotope-labeled analogs, and stereochemically consistent building blocks for peptide science and industrial intermediate preparation.

4. Chemical Biology Probes

H-L-MePhe-OH*HCl can be used in chemical biology research to generate aromatic amino acid substitutions within peptides, proteins, or affinity ligands that probe molecular recognition. The MePhe aromatic side chain enables hydrophobic and π-interaction contributions that can be tuned through controlled incorporation into biosynthetic constructs or conjugation-ready peptide fragments. The backbone's carboxylic acid and amino group support transformation into protected forms for selective coupling to linkers, tags, or reactive handles used in biomolecule labeling workflows. Downstream derivatives prepared from H-L-MePhe-OH*HCl may serve as defined stereochemical probes for studying binding determinants, mapping interaction surfaces, and supporting analytical reference standards for amino acid-containing biomolecules.

5. Pharmaceutical Manufacturing Intermediates

H-L-MePhe-OH*HCl is relevant to pharmaceutical intermediate preparation where defined stereochemistry and amino acid functionality are required for upstream synthesis of drug-like peptidomimetics and peptide fragments. The compound's α-amino acid structure allows conversion into N-protected amino acid derivatives and activated carboxyl intermediates that can be incorporated into larger synthetic sequences while maintaining stereochemical integrity. The MePhe side chain can be used to modulate lipophilicity and aromatic character in intermediate scaffolds that later undergo further functional group manipulation. Industrially, the hydrochloride salt can be integrated into manufacturing routes that require stable, weighable chiral feedstocks for producing peptide building blocks and related fine chemicals used in downstream API or intermediate manufacturing pipelines.

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