4-Phenyl-D-Phenylalanine is a non-proteinogenic, aromatic amino acid derivative in which the side chain bears an additional phenyl substituent relative to phenylalanine, and the amino acid backbone is configured as D at the alpha carbon. The molecule contains a primary amino group and a carboxyl group on the backbone, while the extended diaryl side chain provides a hydrophobic, π-rich aromatic surface that can participate in stacking and other noncovalent interactions. In peptide and chemical biology workflows, this structure is used as a substrate analogue to introduce a sterically and electronically modified aromatic residue for structure-activity studies, protein engineering experiments, and the preparation of labeled or conformationally perturbed peptide derivatives.
CAT No: CP16302
4-Phenyl-D-Phenylalanine is a D-configured, non-proteinogenic amino acid featuring a stereogenic α-carbon and an additional phenyl-substituted aromatic side chain, giving it a strongly hydrophobic, conformationally informative scaffold. This chiral, bulky aromatic building block is frequently used in peptide and peptidomimetic development where stereochemistry and aromatic sterics are leveraged to probe structure-activity relationships and to tune local geometry in synthetic sequences.
1. Peptidomimetic Building Blocks
4-Phenyl-D-Phenylalanine is used by medicinal chemistry and peptide drug discovery groups to introduce a conformationally and sterically defined aromatic residue into peptidomimetics and non-natural peptide analogs. Its D-configuration helps researchers access stereochemical variants that can be incorporated into custom peptide synthesis workflows, supporting SAR studies where changes in side-chain bulk and chirality are evaluated across analog series. The aromatic-rich character also supports downstream development of hydrophobic interaction patterns in binding assays and structure-function characterization of synthetic ligands.
2. Structure-Activity Relationship Studies
4-Phenyl-D-Phenylalanine serves as a targeted substitution unit for chemical biology teams mapping how aromatic side-chain identity, steric demand, and stereochemistry influence biological readouts in assay-driven campaigns. Researchers commonly employ this scaffold to compare analogs that differ specifically at the aromatic residue position, enabling clearer attribution of effects to side-chain geometry rather than backbone changes. In practice, it is particularly useful when a program requires systematic variation of hydrophobic/aromatic contributions while maintaining a defined D-amino acid stereochemical element.
3. Chiral Synthesis Intermediate
4-Phenyl-D-Phenylalanine is also deployed in pharmaceutical intermediate development as a chiral building block for preparing downstream non-natural amino acid derivatives used in synthetic route scouting and library manufacture. Process and synthesis teams value its defined stereochemistry and robust aromatic functionality when designing intermediates for further functionalization, incorporation into larger fragments, or conversion into protected forms for controlled assembly steps. This makes it a practical choice for custom chemical manufacturing workflows where stereochemical fidelity and aromatic substitution patterns must be preserved through multi-step sequences.
4. Analytical Reference Material
4-Phenyl-D-Phenylalanine can be used as an analytical reference standard in method development and characterization of synthetic mixtures containing D-amino acid motifs. Analytical chemistry groups often rely on well-defined chiral amino acid standards to support LC methods, stereochemical verification workflows, and impurity profiling during peptide intermediate and peptidomimetic synthesis. The compound's distinct aromatic signature and stereochemical definition make it useful for confirming identity and monitoring compositional consistency across synthesis batches and derivative preparations.
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