DL-2-Hydroxykynurenine is a hydroxy-substituted kynurenine derivative classified as an aromatic amino acid analogue, featuring a ring system with a hydroxyl group at the 2-position relative to the side chain and an amino-acid backbone bearing an amino group and a carboxyl group. The molecule is provided as a DL mixture, and its side-chain functionality includes a phenolic hydroxyl capable of participating in hydrogen bonding and redox-relevant chemistry, while the amino and carboxyl groups define its zwitterionic character in aqueous media. DL-2-Hydroxykynurenine is used in chemical biology and analytical method development as a substrate or reference compound for studies of aromatic amino acid metabolism, enzyme-substrate assays, and LC-MS-based quantification or isotopic-tracing workflows when appropriate.
CAT No: CP22006
DL-2-Hydroxykynurenine is a hydroxy-substituted kynurenine-derived amino acid metabolite featuring a heteroaromatic quinazolinone-like scaffold with a phenolic secondary alcohol at the 2-position and a carboxylic acid functionality that can be present as a free acid or converted to an ester or protected form for synthesis. The molecule contains multiple heteroatom sites capable of hydrogen bonding and metal coordination, while the phenolic hydroxyl and carboxylate enable controlled derivatization, oxidation-state manipulation, and selective protection strategies during multi-step sequences. The DL designation indicates racemic stereochemistry at the chiral center associated with the 2-hydroxy substituent, which is relevant for studies requiring stereochemical resolution, chiral intermediate preparation, or comparison of enantiomer-specific reactivity. The conjugated aromatic system and polar functional groups make DL-2-Hydroxykynurenine a practical biochemical research intermediate and a chemically tractable precursor for downstream functionalization and analytical standards.
1. Chemical Biology Metabolite Studies
DL-2-Hydroxykynurenine is applied in chemical biology research to model kynurenine-pathway metabolite chemistry and to support experiments that probe enzyme tolerance toward polar, phenolic amino acid derivatives. The phenolic hydroxyl and carboxylic acid groups provide defined handles for derivatization into esters, amides, or protected intermediates, enabling controlled handling under peptide-coupling or coupling-adjacent conditions. The racemic stereocenter can be leveraged for method development in stereoselective assays, including comparative substrate profiling and chromatographic separation workflows. Downstream conversion into labeled or derivatized analogs can support metabolite tracking, reaction monitoring, and mechanistic studies of hydroxylated heteroaromatic intermediates within amino acid metabolism research.
2. Enzyme Substrate Profiling
DL-2-Hydroxykynurenine is suitable for enzyme studies that evaluate substrate recognition and catalytic competence for hydroxylated kynurenine-like scaffolds. The heteroaromatic ring system and the 2-hydroxy substituent together create a substrate surface with hydrogen-bonding patterns that can interact with active-site residues, while the carboxylate can participate in ionic binding or be masked as an ester during synthetic manipulations. Protecting-group strategies such as phenolic protection and carboxyl activation can be employed to generate analogs that isolate specific binding determinants or to prepare intermediates for inhibitor screening libraries. The resulting derivatives can serve as defined biochemical research intermediates for kinetic studies, structure-function comparisons, and substrate analog generation in enzymology workflows.
3. Analytical Standards And LC-MS Methods
DL-2-Hydroxykynurenine is used as an analytical reference material for developing and validating LC-MS and HPLC methods targeting hydroxylated kynurenine metabolites. The presence of a phenolic hydroxyl and a carboxylic acid enables predictable ionization behavior and derivatization options that can improve detection sensitivity or chromatographic retention for polar metabolite panels. Racemic composition supports method robustness testing across stereochemical mixtures, while optional conversion to protected esters or derivatized forms can help optimize sample preparation and reduce adsorption losses. Downstream preparation of stable derivatives supports routine quantitation workflows, metabolite identification, and comparative profiling in biochemical research intermediate analysis.
4. Peptidomimetic And Conjugation Building Blocks
DL-2-Hydroxykynurenine can be applied in peptidomimetic and bioconjugation chemistry where a polar, heteroaromatic amino acid-like core is incorporated into larger molecular scaffolds. The carboxylic acid functionality can be activated for amide or ester formation, while the phenolic hydroxyl can be protected, selectively deprotected, or transformed into leaving-group-bearing derivatives for controlled coupling. The stereogenic 2-hydroxy center enables design of stereochemically defined conjugates when paired with enantiomeric separation or stereospecific downstream transformations. The resulting conjugation-ready intermediates can be used to generate molecular probes, affinity reagents, or scaffold fragments for structure-activity relationship studies in amino acid derivative chemistry.
5. Process Chemistry Intermediate Synthesis
DL-2-Hydroxykynurenine is relevant to process chemistry intermediate preparation for manufacturing workflows that require hydroxylated heteroaromatic amino acid derivatives as feedstocks. The compound's functional group set supports scalable protection/deprotection logic, including phenolic protection and carboxyl activation to enable downstream conversion into esters, amides, or activated intermediates used in multi-step syntheses. Racemic availability can simplify early-stage material supply for library synthesis, analytical method development, or derivative screening, with stereochemical resolution introduced only when required by downstream specifications. The heteroaromatic scaffold and polar groups can be carried through controlled reaction sequences, supporting the generation of fine chemical synthesis intermediates and specialty chemical production targets derived from amino acid chemistry.
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