DL-DiPhenylalanine is a free amino acid derivative in which two phenyl rings are present on the side chain, classifying it as a di-aryl substituted phenylalanine analogue within the amino acid family. The molecule contains both an amino group and a carboxyl group, and the "DL" designation indicates a racemic mixture of stereoisomers at the α-carbon while maintaining the characteristic benzyl-like connection to the side chain. As a non-proteinogenic or analogue building block, it is used in peptide and peptidomimetic synthesis and in structure-property studies where di-phenyl side-chain character is used to tune aromatic packing, hydrophobicity, and labeling or conjugation chemistry for analytical and chemical biology workflows.
CAT No: CP17103
DL-DiPhenylalanine is a racemic dipeptide composed of two phenylalanine residues linked through an amide bond, providing a defined peptide backbone with two stereocenters that are present as an equimolar mixture of configurations. The molecule presents aromatic side chains with benzylic stereochemical information, along with terminal functional groups that can be engaged in coupling, protection, or selective derivatization depending on the salt form and terminal state. The peptide bond and adjacent amide carbonyls enable predictable reactivity under peptide coupling and deprotection conditions, while the hydrophobic phenyl rings support strong intermolecular interactions relevant to biomolecular materials and analytical behavior. As a chiral-averaged peptide building block, DL-DiPhenylalanine functions as a practical intermediate for peptide synthesis workflows and as a platform for downstream functionalization of peptide analogs.
1. Peptide Synthesis
DL-DiPhenylalanine serves as a peptide synthesis intermediate for assembling short phenylalanine-rich sequences in research and fine chemical workflows. The dipeptide structure contains an amide-linked backbone and phenylalanine side chains that can be further coupled at terminal functionality, enabling stepwise construction of longer peptides or peptidomimetic scaffolds. Racemic stereochemistry can be maintained for screening libraries or can be converted into stereodefined analogs through resolution strategies or by using stereopure building blocks in subsequent steps. Downstream use can include generating protected peptide fragments for iterative coupling chemistry and supporting structure-activity relationship studies where backbone length and aromatic content are key variables.
2. Peptidomimetics And SAR
DL-DiPhenylalanine is applicable to peptidomimetic design and SAR-focused molecular scaffold development where phenylalanine aromaticity and dipeptide geometry drive physicochemical properties. The two phenyl rings and the amide linkage provide a rigid, hydrogen-bonding capable motif that can be transformed into constrained analogs, such as through side-chain functionalization or backbone modifications that preserve aromatic spacing. Terminal functional groups can be used to introduce electrophiles, linkers, or solubilizing groups for analog libraries, supporting comparative evaluation of binding or aggregation tendencies in biochemical assays. The racemic nature supports rapid generation of compound sets for SAR mapping before stereochemical refinement using chiral intermediates.
3. Chemical Biology Probes
DL-DiPhenylalanine can be employed in chemical biology research as a phenylalanine-based peptide module for probe construction and biomolecular interaction studies. The peptide backbone presents multiple hydrogen-bond donors/acceptors and aromatic side chains that can participate in noncovalent recognition, while terminal functionality can be modified to install fluorophores, affinity tags, or clickable handles for downstream conjugation. Peptide coupling compatibility enables attachment to carrier proteins, polymers, or solid supports, supporting studies of peptide-mediated binding, uptake, or surface adsorption mechanisms. The resulting labeled or derivatized peptide probes can serve as practical tools for mechanistic experiments and for mapping how aromatic peptide motifs influence biomolecular interfaces.
4. Biomaterial Building Blocks
DL-DiPhenylalanine is suitable for functional materials research and specialty chemical production where phenylalanine-rich peptide motifs are used to generate self-assembled structures. The two aromatic side chains and amide backbone promote strong intermolecular interactions that can lead to ordered assemblies, and the dipeptide format supports scalable preparation of peptide-based materials precursors. Terminal derivatization can tune solubility, crosslinking behavior, and surface attachment, enabling fabrication of peptide-functional coatings, membranes, or composite additives. Industrial relevance may include producing peptide-derived feedstocks for materials manufacturing routes that require controlled aromatic content and peptide backbone integrity.
5. Pharmaceutical Intermediate Preparation
DL-DiPhenylalanine can be used in pharmaceutical intermediate preparation for generating protected or derivatized peptide fragments used in medicinal chemistry synthesis. The defined dipeptide unit supports conversion into N- and/or C-terminal protected derivatives that are compatible with standard peptide coupling strategies, enabling incorporation into larger sequences or into peptidomimetic intermediates. Amide functionality and terminal groups allow controlled transformations such as esterification, amidation, or selective deprotection to match downstream synthetic steps. The racemic starting material can also be applied in process chemistry contexts where stereochemical purity is addressed later in the route using stereoselective steps or chiral resolution.
6. Analytical Standards and Labeling
DL-DiPhenylalanine is appropriate for analytical research as a reference peptide and as a platform for isotope-labeling or derivatization strategies. The peptide backbone and phenylalanine residues provide characteristic fragmentation patterns for mass spectrometric identification, supporting method development for peptide quantification, degradation studies, or stability-indicating assays. Terminal functional groups can be modified to generate labeled standards, internal calibrants, or derivatized species that improve detectability and chromatographic behavior. Downstream utility includes supporting quality control workflows in peptide manufacturing and enabling robust analytical characterization of phenylalanine-containing peptide intermediates.
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