H-D-Phg-NH2 · HCl

H-D-Phg-NH2 · HCl is the hydrochloride salt of the D-enantiomer of 2-amino-3-(phenyl)glycinamide-like amino acid derivative (Phg) presented as a free amine at the alpha position and a terminal primary amine at the carboxamide-equivalent end, with chloride counterion stabilizing the protonated form for handling. The D stereochemistry at the chiral center supports stereochemically defined incorporation into peptide-like frameworks and chiral recognition studies. The phenyl-substituted backbone provides a hydrophobic/aromatic side-chain handle, while the salt form enhances aqueous solubility and can influence coupling and derivatization conditions. The compound's amino functionality enables formation of amide bonds, urea/guanidine-type derivatives, and protected amino acid intermediates that feed directly into peptide synthesis and downstream heterocycle or peptidomimetic construction.

1. Peptide Synthesis

H-D-Phg-NH2 · HCl supports peptide building-block workflows in peptide coupling chemistry where the D-configuration can be retained to generate stereodefined analogs. The presence of an amino acid-derived amine functionality and a phenyl-bearing side chain enables conversion into N-protected forms and subsequent amide bond formation at the desired coupling site. Salt-state protonation can be managed through base-mediated deprotonation during coupling, allowing compatibility with common peptide coupling strategies and protecting-group schedules. The resulting D-phenylglycine-containing peptides and peptide segments can be used to probe backbone stereochemical effects, stability, and conformational preferences in peptide science and synthetic methodology development.

2. Peptidomimetics And SAR

H-D-Phg-NH2 · HCl is suitable for peptidomimetic construction and structure-activity relationship studies because the D stereocenter and aromatic side chain can be introduced as a defined chiral element within constrained scaffolds. The amino functionalities can be transformed into protected intermediates for iterative scaffold assembly, including incorporation into longer sequences or cyclized peptidomimetic motifs. Phenyl substitution supports hydrophobic contacts and can influence aromatic stacking interactions in molecular recognition models. Downstream derivatives generated from this amino acid analog can serve as SAR-ready fragments for mapping stereochemical and side-chain contributions to binding profiles in medicinal chemistry and chemical biology programs.

3. Chemical Biology Labeling

H-D-Phg-NH2 · HCl can be applied to chemical biology labeling and biomolecule modification workflows where an amino acid-derived amine serves as a conjugation handle. The free amine(s) can be protected and later selectively deprotected to enable controlled attachment to activated linkers, electrophiles, or bifunctional reagents used for bioconjugation. The D-phenylglycine motif can be embedded into peptides or peptidomimetic probes to tune stability against proteolysis and to maintain stereochemical integrity during labeling. Labeled conjugates derived from this building block can then be used for target engagement studies, probe development, and analytical tracking of biomolecular interactions.

4. Protected Amino Acid Intermediates

H-D-Phg-NH2 · HCl functions as a chiral amino acid intermediate for preparing N-protected derivatives used in protected amino acid synthesis. The hydrochloride salt form can be leveraged for reproducible handling prior to installation of orthogonal protecting groups that control chemoselective coupling at each amino site. The D stereocenter and phenyl side chain remain intact through protection/deprotection sequences, enabling consistent stereochemical outcomes in downstream peptide building-block preparation. Protected derivatives derived from this compound can feed into fine chemical synthesis routes that require stereodefined chiral inputs for manufacturing-grade peptide fragments and research intermediates.

5. Process Chemistry Intermediate

H-D-Phg-NH2 · HCl is applicable in process chemistry intermediate preparation where salt formation supports solid handling, controlled dissolution, and reproducible feedstock behavior in multistep syntheses. The amino acid-derived structure can be converted into activated coupling-ready forms through protection and functional group interconversions that align with scalable peptide intermediate manufacturing. The phenyl-bearing chiral scaffold can be maintained through controlled reaction sequences, aiding stereochemical fidelity in production of D-phenylglycine-containing intermediates. Downstream use includes supplying chiral inputs for peptide analog manufacturing, peptidomimetic fragment production, and stereochemically defined specialty chemical synthesis.

6. Analytical Standards and Method Development

H-D-Phg-NH2 · HCl can serve as an analytical reference material for method development in amino acid analysis, chiral separation, and peptide hydrolysate profiling. The D-configuration and phenylglycine identity provide a distinct stereochemical and structural signature for LC-MS, chiral HPLC, or derivatization-based quantitation workflows. Salt-state composition can improve reproducibility of sample preparation and calibration behavior when comparing protonation-sensitive signals. Analytical standards derived from this compound can support verification of stereochemical incorporation in peptide synthesis and quality control of D-phenylglycine-containing intermediates used in research and industrial chemical manufacturing.

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