D-Phenylglycine is a D-configured, non-proteinogenic amino acid featuring a benzyl-like phenyl side chain attached to the alpha carbon bearing both an amino group and a carboxyl group. The molecule exists as a zwitterionic amino acid under aqueous conditions and presents a stereogenic center at the alpha position, with the phenyl side chain providing hydrophobic character and potential for aromatic interactions in peptide or small-molecule frameworks. D-Phenylglycine is used in peptide synthesis and structure-activity studies as a stereodefined phenylglycine building block to probe how aromatic side-chain placement and chirality influence conformational preferences and binding behavior in synthetic analogues.
D-Phenylglycine is a chiral amino acid with a benzyl-substituted backbone, where the stereogenic center at the alpha-carbon is defined as the D-configuration. The molecule contains a primary amino group and a carboxylic acid, enabling salt formation and standard amino-acid coupling chemistry, while the phenyl side chain provides hydrophobic and aromatic interaction motifs useful in molecular recognition. As an unprotected amino acid, D-Phenylglycine can participate in peptide bond formation after conversion to an activated derivative or protection of the amino and/or carboxyl functionality. The aromatic substituent and chiral stereochemistry make it a practical chiral building block for constructing enantioenriched intermediates and stereodefined peptide or peptidomimetic analogs.
1. Chiral Building Block
D-Phenylglycine is used in chiral synthesis programs where the D-stereocenter serves as a stereochemical anchor for downstream derivatization. The amino and carboxyl groups can be selectively protected to control chemoselective transformations, while the phenyl side chain can be retained to maintain aromatic recognition features. Conversion to protected forms or activated carboxyl derivatives supports stereospecific incorporation into larger chiral frameworks, including unnatural amino acid intermediates. D-Phenylglycine thus functions as a reliable chiral amino acid intermediate for fine chemical synthesis and stereodefined scaffold construction.
2. Peptide Coupling Chemistry
D-Phenylglycine is applied as an amino acid component in peptide synthesis workflows that require incorporation of a phenylglycine residue with defined D-configuration. The presence of both an amino nucleophile and a carboxylic acid enables peptide coupling after appropriate protection strategies, such as N-protection and carboxyl activation, to suppress side reactions. The aromatic side chain can influence local conformational preferences and can be leveraged in peptide analog construction for structure-activity relationship studies. D-Phenylglycine therefore supports the preparation of stereodefined peptide building blocks and peptidomimetic sequences compatible with standard coupling chemistries.
3. Peptidomimetics And SAR
D-Phenylglycine is suitable for peptidomimetic design where aromatic side-chain presentation and alpha-chirality are used to tune binding interactions. The amino acid backbone can be transformed into amide-linked analogs, while the phenyl substituent can be maintained or further functionalized after incorporation into a larger structure. Protecting-group strategies allow controlled elaboration of the nitrogen and carboxyl-derived functionalities, enabling sequential synthesis of SAR libraries. D-Phenylglycine can be employed as a stereodefined fragment in molecular design efforts that map how D-amino acid incorporation affects structure-function relationships.
4. Amino Acid Derivatization
D-Phenylglycine is utilized for amino acid derivatization routes that generate downstream intermediates for specialty chemical production. The free amino and carboxylic acid groups can be converted into esters, amides, or protected derivatives to enable controlled reactivity in multi-step syntheses. The aromatic side chain can participate in further functional group transformations on the phenyl ring or serve as a stable hydrophobic handle during derivatization of the backbone. D-Phenylglycine thereby supports process chemistry intermediate preparation and the manufacture of enantioenriched chiral building blocks used across synthetic organic chemistry.
5. Analytical And Reference Standards
D-Phenylglycine is applied in analytical research where enantiopure amino acid standards are required for method development and stereochemical verification. The D-configuration and aromatic phenyl side chain provide distinct chromatographic and spectrometric signatures when analyzed as the native amino acid or as derivatized forms. Conversion to protected or derivatized analogs can improve detectability and support chiral separation workflows used in peptide chemistry and amino acid profiling. D-Phenylglycine can therefore serve as a reference material for analytical research and quality-oriented characterization of amino acid derivatives and peptide building blocks.
6. Pharmaceutical Intermediate Synthesis
D-Phenylglycine is used as an amino acid-based intermediate in pharmaceutical and specialty fine chemical manufacturing contexts where chiral fragments are assembled into larger bioactive scaffolds. The stereogenic alpha-carbon enables incorporation of D-phenylglycine motifs into peptidic or peptidomimetic structures, while the functional groups support conversion to protected amino acid derivatives for controlled coupling steps. Protecting-group manipulation and activation of the carboxyl functionality can be integrated into manufacturing routes that require reproducible stereochemical outcomes. D-Phenylglycine thus functions as a practical chiral intermediate for downstream synthesis of complex, stereodefined molecules used in applied product development.
3. SERS spectrum of the peptide thymosin‐β4 obtained with Ag nanorod substrate
5. Cationic cell-penetrating peptides are potent furin inhibitors
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