DL-3-Hydroxykynurenine is a DL (racemic) hydroxylated kynurenine derivative in the amino acid/heteroaromatic amino acid class, featuring a 3-hydroxy-substituted kynurenine skeleton with an amino acid-like framework. The molecule contains a free amino group and a carboxyl group along with a phenolic hydroxyl on the aromatic ring, which can participate in hydrogen bonding and redox-relevant chemistry associated with hydroxyindole/phenol motifs. DL-3-Hydroxykynurenine is used as a defined building block and analytical reference for studies of aromatic amino acid chemistry, isotopic and derivatization-based quantification, and the preparation of further heteroaromatic amino acid derivatives for chemical biology and peptide-related synthesis research.
CAT No: CP22003
DL-3-Hydroxykynurenine is a hydroxy-substituted kynurenine derivative featuring an amino acid-like aromatic side chain with a phenolic hydroxyl at the 3-position and a carboxylic acid functionality consistent with amino acid chemistry. The molecule exists as a DL mixture at the stereogenic center, enabling preparation of both enantiomeric forms of kynurenine-pathway analogs through downstream resolution or stereoselective derivatization strategies. The phenolic OH and the ring nitrogen/amide-like functionality support controlled protection, oxidation-state manipulation, and derivatization to activate carboxyl chemistry for coupling or to generate analytical tags. Reactivity patterns align with peptide and bioconjugation-adjacent workflows, where phenolic groups can be protected for selective transformations and later deprotected to restore native phenolic character for downstream studies.
1. Metabolic Pathway Research
DL-3-Hydroxykynurenine is used in chemical biology and biochemical research to probe kynurenine-pathway chemistry and phenolic redox behavior in vitro. The aromatic heterocycle bearing a phenolic hydroxyl and a carboxylic acid group enables studies of substrate-like reactivity, metabolite interconversion, and derivatization-based detection in complex matrices. DL stereochemistry supports experiments that require racemic standards for method development, while enantiomer-specific workflows can apply resolution or stereoselective downstream conversion to interpret stereochemical effects. Downstream derivative formation can include protected phenol analogs, carboxyl-activated intermediates, or spectroscopic/LC-MS tags that improve metabolite identification and quantitation.
2. Analytical Reference Standards
DL-3-Hydroxykynurenine is suitable for analytical research as a reference material for LC-MS, HPLC, and derivatization-assisted detection of kynurenine metabolites. The combination of phenolic hydroxyl and carboxylic acid provides chemically stable handles for derivatization to enhance chromatographic behavior and ionization characteristics, including esterification or phenol-protecting-group strategies that can be reversed for confirmatory workflows. Racemic composition supports calibration and method validation where enantiomer separation is not required, while chiral analytical methods can use the compound as a starting point for enantiomer-specific standards. Generated labeled or derivatized analogs can serve as internal standards or structural probes for monitoring pathway-related transformations in biochemical assays.
3. Peptidomimetic Building Blocks
DL-3-Hydroxykynurenine can be applied in synthetic organic chemistry to construct peptidomimetic scaffolds that incorporate kynurenine-like aromatic motifs into peptide analogs. The carboxylic acid functionality supports conversion to activated esters or amide-forming intermediates, enabling coupling to amines under peptide-coupling conditions while the phenolic hydroxyl can be temporarily protected to maintain chemoselectivity. DL stereochemistry can be leveraged when the target scaffold tolerates racemic incorporation, or it can guide stereochemical studies by comparing derivatives derived from resolved enantiomers. Phenol deprotection downstream can restore the native hydroxyl for hydrogen-bonding and metal-chelation-like interactions that influence molecular recognition.
4. Side-Chain Functionalization Chemistry
DL-3-Hydroxykynurenine is used for side-chain functionalization strategies in amino acid derivatization and molecular design programs. The phenolic hydroxyl can undergo protection, selective oxidation-state manipulation, or controlled substitution to introduce handles for further conjugation, such as linkers for polymer attachment or affinity reagents. The carboxylic acid enables orthogonal activation relative to the aromatic hydroxyl, supporting stepwise synthesis of derivatives where one functional group is transformed without perturbing the other. Resulting functionalized kynurenine analogs can serve as intermediates for biomolecule labeling, probe synthesis, or fragment-based scaffold elaboration in applied chemical research.
5. Chemical Manufacturing Intermediates
DL-3-Hydroxykynurenine is relevant to process chemistry and specialty chemical production as a kynurenine-pathway intermediate for fine chemical synthesis. The molecule's defined aromatic heterocycle, phenolic hydroxyl, and carboxylic acid allow it to be routed through protection/deprotection sequences and carboxyl activation steps that are compatible with scalable intermediate manufacturing. Racemic supply can simplify procurement for downstream derivatization where stereochemistry is introduced later by enzymatic resolution, chiral derivatization, or selective transformation. Downstream products may include protected amino acid-like derivatives, activated building blocks for amide formation, or analytical-grade kynurenine analogs used across chemical manufacturing workflows.
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