H-p-Chloro-DL-Phe-OMe · HCl

H-p-Chloro-DL-Phe-OMe · HCl is a hydrochloride salt of a methyl ester amino acid derivative in which a p-chloro substituent on the phenyl ring modulates aromatic electronics and reactivity. The compound contains an amino functionality that is present as a protonated chloride salt, paired with a C-terminal methyl ester that can participate in peptide coupling after appropriate activation or conversion to an acylating handle. The DL stereochemical designation indicates a racemic mixture at the α-carbon, which supports stereochemical screening workflows and chiral-resolution studies rather than enforcing a single enantiomeric outcome. The aryl chloride and ester groups enable downstream transformations such as electrophilic aromatic substitution, nucleophilic aromatic substitution after activation, and ester-to-amide conversion for peptide building block preparation.

1. Protected Amino Acid Chemistry

H-p-Chloro-DL-Phe-OMe · HCl is applied in protected amino acid synthesis workflows where the amino group is handled under salt-stabilized conditions prior to conversion into a coupling-ready form. The α-amino functionality and methyl ester allow controlled derivatization strategies, including ester activation for amide formation and subsequent introduction of orthogonal N-protection when targeting peptide-grade intermediates. The p-chloro-substituted phenyl side chain provides an aryl handle that can be retained through peptide assembly or selectively transformed afterward to generate halogenated aromatic motifs. The resulting intermediates can be carried into protected amino acid chemistry for stepwise construction of peptide fragments and for preparing downstream analogs used in synthetic methodology development and SAR-oriented libraries.

2. Peptide Synthesis Coupling

H-p-Chloro-DL-Phe-OMe · HCl is utilized in peptide synthesis as a phenylalanine-based building block precursor for generating C-terminally modified peptide segments. The methyl ester can be converted to an activated acyl species or reformatted into an amide-compatible derivative, while the α-amino group supports peptide coupling chemistry after appropriate neutralization and activation. The racemic (DL) stereochemistry can be leveraged for parallel synthesis and coupling condition screening, with later stereochemical separation or conversion to enantiomerically enriched analogs when required. The aryl chloride substituent can survive standard coupling steps depending on conditions, enabling chlorinated aromatic incorporation into peptide backbones or peptide mimetic scaffolds for downstream functionalization.

3. Chemical Biology Labeling

H-p-Chloro-DL-Phe-OMe · HCl serves chemical biology and biomolecule modification pipelines where aromatic amino acid motifs are introduced as recognition elements or linker-bearing handles. The methyl ester and amino group can be transformed into conjugation-ready derivatives, while the p-chloro substituent can participate in substitution or coupling strategies that attach probes, affinity tags, or reactive linkers to peptide-derived constructs. The salt form supports reproducible handling during derivatization steps that precede conjugation, including conversion to amide or activated ester derivatives suitable for controlled attachment to carrier proteins or biomolecular scaffolds. The resulting labeled amino acid or peptide analog intermediates can be applied to mapping studies, probe generation, and structure-function investigations that depend on defined aromatic substitution patterns.

4. Peptidomimetics And SAR Studies

H-p-Chloro-DL-Phe-OMe · HCl is used in peptidomimetic construction and structure-activity relationship studies where a chlorinated phenylalanine motif contributes to hydrophobicity and electronic tuning in amino acid-derived scaffolds. The α-amino and ester functionalities enable conversion into amide-linked analogs, while the aryl chloride provides a chemically addressable site for diversification into substituted aromatic variants. The DL stereochemistry supports rapid generation of racemate-based analog panels for SAR screening, with subsequent chiral refinement when enantioselective behavior becomes a design criterion. The compound can be carried through medicinal chemistry intermediate preparation to produce peptide analogs and non-natural amino acid derivatives that are compatible with iterative scaffold elaboration and SAR-focused library synthesis.

5. Process Chemistry Intermediate

H-p-Chloro-DL-Phe-OMe · HCl is suitable for process chemistry intermediate preparation in fine chemical manufacturing routes that require an amino acid ester platform with a stable, isolable salt form. The hydrochloride salt form can improve handling characteristics during scale-up operations that involve neutralization and conversion to activated coupling derivatives, while the methyl ester provides a straightforward handle for downstream amide formation in continuous or batch synthesis. The p-chloro aryl group can be retained through intermediate stages to reduce late-stage functional group manipulation, supporting manufacturing designs that minimize step count and divergence. The compound's defined functional group set makes it applicable as a chiral synthetic intermediate precursor for stereochemical downstream processing, including resolution strategies or conversion to enantiopure derivatives when manufacturing specifications demand single-enantiomer outputs.

6. Analytical Standards for Derivatization

H-p-Chloro-DL-Phe-OMe · HCl is applied in analytical research as a derivatization and reference material precursor for monitoring amino acid ester and halogenated aromatic motifs. The methyl ester and amino functionality enable conversion into detectable derivatives for chromatographic or spectrometric workflows, including transformation into amide or activated ester forms that enhance signal stability and reproducibility. The presence of the p-chloro substituent provides a distinct aromatic signature that can improve selectivity in method development for amino acid derivative panels. The racemic nature supports method validation across both enantiomeric forms when chiral separation is part of the analytical strategy, enabling robust quantification of derivatization efficiency and intermediate integrity in amino acid chemistry and peptide synthesis process monitoring.

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