D-Kynurenine is the D-enantiomer of kynurenine, a non-proteinogenic aromatic amino acid derivative featuring a fused bicyclic ring system and a side chain that bears an amino group and a carboxyl group. The molecule contains an anilide-like aromatic framework with a heteroaromatic nitrogen in the kynurenine core, and its stereochemistry is specified by the D-configuration at the chiral center associated with the amino acid side chain. D-Kynurenine is used as a substrate or reference material in amino acid and metabolite profiling, isotopic labeling studies, and structure-activity or enzyme-substrate investigations where aromatic amino acid scaffolds and their stereochemical forms are examined.
CAT No: CP22102
D-Kynurenine is the D-stereoisomer of kynurenic acid precursor, an aromatic amino acid derivative characterized by a chiral center at the α-carbon, a ring-conjugated heteroaromatic system, and a side-chain bearing both an amino and a carboxyl functionality. The molecule contains a conjugated indole-like framework with multiple heteroatoms that influence acidity, hydrogen-bonding capacity, and redox/complexation behavior in aqueous and mixed-solvent media. As a chiral amino acid metabolite analog, D-Kynurenine can participate in nucleophilic and electrophilic transformations at the amino group and can undergo carboxyl-directed activation for amide formation. The stereochemical configuration and functional group pattern make it a practical chiral building block and biochemical research intermediate for downstream derivatization, labeling, and heterocycle-adjacent scaffold construction.
1. Peptide Coupling Intermediate
D-Kynurenine serves as a chiral amino acid derivative for peptide coupling chemistry and side-chain incorporation into constrained peptide-like motifs. The α-amino and carboxyl groups enable activation of the acid (or protection of the amine) to form amide bonds under standard peptide coupling conditions, while the aromatic heterocycle can act as a recognition element in peptide analogs. Stereochemical integrity at the D-α-center can be maintained through appropriate protection-group strategies and mild coupling workflows, supporting stereodefined peptide building block preparation. Downstream, D-Kynurenine-derived amides can be used to generate peptidomimetic libraries and to probe how chiral aromatic residues influence backbone conformation and binding-site interactions in structure-activity relationship studies.
2. Chemical Biology Probes
D-Kynurenine is suitable for chemical biology research where metabolite-like chiral aromatic amino acid derivatives are used to interrogate enzyme specificity and binding interactions. The molecule's conjugated heteroaromatic core and amino/carboxyl functionality support derivatization into tagged analogs, including N-functionalized derivatives for affinity probes or carboxyl-activated conjugates for immobilization. Protecting-group control of the amino group and selective activation of the carboxyl group can guide synthesis toward biophysical study formats such as immobilized ligands, pull-down reagents, or assay-compatible standards. Resulting D-Kynurenine conjugates can be applied as biochemical research intermediates to generate molecular tools for pathway mapping, ligand competition experiments, and stereochemical dependence assessments in enzyme-substrate or inhibitor-design workflows.
3. Bioconjugation And Labeling
D-Kynurenine can be employed in bioconjugation chemistry as a chiral scaffold for attaching aromatic amino acid motifs to biomolecules or solid supports. The presence of a primary amino group and a carboxyl group enables orthogonal functionalization strategies, such as converting the carboxyl into an activated ester for coupling to amines on proteins or polymers, while protecting the amino group to avoid uncontrolled crosslinking. The heteroaromatic ring can contribute to fluorescence/UV absorbance readouts or serve as a stable chromophore handle when designing analytical or imaging-compatible conjugates. Labeled D-Kynurenine derivatives can then function as analytical research reagents, calibration standards, or biomolecule modification intermediates for downstream detection and quantification workflows.
4. Chiral Building Block Synthesis
D-Kynurenine is a chiral amino acid intermediate for stereoselective synthesis of functionalized aromatic derivatives and heterocycle-adjacent scaffolds. The D-configuration at the α-carbon provides a defined stereochemical element that can be carried through to downstream transformations, including N-protection followed by selective functional group interconversions and carboxyl activation steps. The amino and carboxyl groups can be strategically masked to enable chemistry on the aromatic system while preserving the chiral center, supporting the preparation of D-configured analogs for SAR studies and stereochemical reference materials. Downstream synthetic utility includes use as a starting material for fine chemical synthesis routes that require a defined chiral aromatic amino acid motif and predictable functional group reactivity.
5. Pharmaceutical Intermediate Preparation
D-Kynurenine can be applied as a chiral biochemical intermediate in pharmaceutical intermediate preparation where metabolite-like scaffolds are transformed into structure-defined analogs. The compound's amino and carboxyl functionalities support conversion into amide derivatives, N-substituted intermediates, and activated carboxyl intermediates used to assemble larger medicinal chemistry fragments. The conjugated heteroaromatic core can participate in medicinal chemistry design as a rigid, hydrogen-bonding-capable moiety, enabling incorporation into fragment libraries and stereodefined candidate scaffolds. Industrially relevant downstream use includes process chemistry intermediate generation for specialty chemical production, where controlled protection/deprotection and functional group activation steps are compatible with scalable synthetic planning.
6. Analytical Research Standards
D-Kynurenine is suitable for analytical research as a stereodefined reference compound for method development, chiral separation validation, and metabolite profiling workflows. The distinct D-stereochemistry combined with the aromatic heteroaromatic structure provides a measurable signal in common chromatographic and spectrometric detection modes, and the functional groups enable derivatization when enhanced detectability or derivatization-based quantification is required. Carboxyl and amino reactivity can be leveraged to prepare labeled or derivatized standards that support calibration and identity confirmation in complex matrices. Resulting D-Kynurenine-based analytical materials can serve as biochemical research intermediates for routine QA/QC-style analytical method establishment in synthetic and analytical laboratories engaged in amino acid derivative characterization.
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