H-D-beta-HPhe-OH*HCl

H-D-beta-HPhe-OH*HCl is a hydrochloride salt of a D-configured β-homologated phenylalanine derivative, featuring a chiral β-amino acid framework with a side-chain phenyl ring and a free carboxylic acid functionality. The D stereochemistry at the β-carbon supports stereochemically defined incorporation into peptide-like structures and enables controlled behavior in coupling and subsequent transformations. The phenyl side chain provides an aromatic handle for hydrophobic and π-interaction-driven structure-function studies, while the acid group can be activated for amide bond formation or converted into protected acid derivatives for synthetic sequencing. Salt formation with HCl improves handling of the amino functionality and supports downstream use as a chiral amino acid intermediate in peptide building block preparation and amino acid derivatization workflows.

1. Peptide Synthesis

H-D-beta-HPhe-OH*HCl is used in peptide synthesis and peptide building block preparation where a D-configured β-amino acid unit is required to modulate backbone geometry and proteolytic stability. The β-amino and carboxylic acid groups enable standard peptide coupling chemistry after appropriate activation of the acid and, when needed, temporary protection or salt management of the amine. The aromatic phenyl side chain participates in hydrophobic packing and can be used to probe sequence effects in short peptides and peptidomimetic scaffolds. Incorporation of this chiral β-amino acid derivative into growing chains supports the construction of β-substituted peptide analogs for structure-function investigations and synthetic methodology development.

2. Peptidomimetics And SAR

H-D-beta-HPhe-OH*HCl supports peptidomimetic construction and structure-activity relationship studies by providing a stereodefined D-β-amino acid motif that can alter conformational preferences relative to α-amino acid analogs. The β-homologated backbone and phenyl side chain can be leveraged to tune side-chain spacing, aromatic interactions, and local steric profiles in molecular design campaigns. Amide bond formation with this building block enables systematic substitution patterns for SAR mapping, including analog libraries where stereochemistry and backbone length are varied. Downstream derivatization of the carboxyl group and amide-forming capacity can be applied to generate constrained or functionalized peptide-like structures for biochemical assay compatibility.

3. Protected Amino Acid Chemistry

H-D-beta-HPhe-OH*HCl is suitable for protected amino acid chemistry as a chiral amino acid intermediate that can be converted into N-protected or C-terminal protected derivatives for controlled multi-step synthesis. The presence of a free carboxylic acid allows formation of activated esters or protected acid forms, while the β-amino functionality can be masked with standard amine-protecting groups to enable selective coupling sequences. The D stereocenter helps maintain stereochemical integrity during protection and deprotection steps that may be required for iterative peptide assembly. Salt handling with HCl supports practical workflows for preparing derivatives that remain compatible with peptide coupling and downstream fine chemical synthesis.

4. Chemical Biology Probes

H-D-beta-HPhe-OH*HCl can be applied in chemical biology research for designing peptide-like probes and biomolecule-interacting ligands where a D-β-amino acid unit improves resistance to enzymatic degradation. The aromatic phenyl side chain can serve as a recognition element for hydrophobic and π-interaction-driven binding, while the carboxyl group enables conversion into functional handles for conjugation strategies. The β-amino acid framework supports incorporation into labeled peptides or affinity probes using peptide coupling chemistry, including routes that require controlled stereochemistry to preserve binding conformations. Resulting derivatives can be used as research intermediates to generate functional molecules for pathway interrogation and molecular recognition studies.

5. Pharmaceutical Intermediate Preparation

H-D-beta-HPhe-OH*HCl is relevant to pharmaceutical intermediate preparation and process chemistry intermediate design where chiral β-amino acid building blocks are required for manufacturing of peptide-based or peptidomimetic candidates. The compound's defined stereochemistry and functional group set (β-amino and carboxylic acid) support scalable conversion into coupling-ready forms such as activated acids or protected amino acid derivatives used in controlled synthetic sequences. The aromatic side chain provides a stable structural element that can be carried through manufacturing steps and later incorporated into larger intermediates. Downstream synthetic utility includes serving as a chiral feedstock for constructing amide-linked intermediates and for enabling stereochemically consistent assembly of complex nitrogen-containing molecules.

6. Analytical Standards and Method Development

H-D-beta-HPhe-OH*HCl is utilized in analytical research as a chiral amino acid reference material for method development, identity confirmation, and impurity profiling in amino acid and peptide workflows. The D-β-homologated structure with a phenyl side chain provides a distinct stereochemical and structural signature that can be tracked by chromatographic and spectrometric methods after derivatization or coupling-related sample preparation. The hydrochloride salt form supports reproducible handling when preparing calibration standards or internal references for quantitative analysis of amino acid building blocks and related peptide fragments. Analytical compatibility with peptide synthesis and amino acid derivatization pipelines makes it suitable for supporting quality-by-design style characterization of chiral intermediates and downstream process streams.

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