2-Hydroxy-DL-tryptophan is a hydroxy-substituted tryptophan amino acid derivative featuring an indole side chain bearing a 2-hydroxy substituent, with both amino and carboxyl functional groups present in the same molecule. The "DL" designation indicates a racemic mixture of stereochemical forms at the alpha carbon, and the additional hydroxyl group on the aromatic side chain increases polarity and hydrogen-bonding capacity relative to unsubstituted tryptophan. As an amino acid building block, it is used in peptide and amino acid derivative synthesis and in structure-activity or labeling studies where an indole hydroxyl functionality is required to probe effects of side-chain hydrogen bonding, polarity, or altered aromatic reactivity.
CAT No: CP24803
2-Hydroxy-DL-tryptophan is a hydroxy-substituted tryptophan amino acid available as a DL mixture, providing both D- and L-tryptophan stereoisomers for research workflows that require tryptophan-like indole chemistry with an additional secondary hydroxyl group. The indole scaffold supports common tryptophan-reactive analytical strategies, while the extra hydroxyl functionality enables derivatization and downstream conversion into substituted indole-containing building blocks. As a tryptophan analog, it is frequently used where stereochemical mixture is acceptable, such as method development, reference material preparation, and intermediate synthesis for indole-functional targets.
1. Indole-Analog Building Block
2-Hydroxy-DL-tryptophan is used as an amino acid building block for preparing substituted indole-containing intermediates in medicinal chemistry and heteroaromatic synthesis programs. The combination of an indole ring and a side-chain hydroxyl group supports selective functionalization routes that lead to hydroxyindole motifs found in bioactive-scaffold libraries and kinase/GPCR ligand discovery chemistry. Researchers and process development chemists value the DL format when the downstream chemistry tolerates stereochemical mixtures, allowing faster access to hydroxyindole derivatives for SAR screening and parallel synthesis workflows.
2. Peptide Derivative Synthesis
2-Hydroxy-DL-tryptophan is applied in the synthesis of tryptophan-containing peptide derivatives and peptidomimetic structures where an indole with a hydroxyl-bearing side chain is required to probe structure-property relationships. In custom peptide synthesis and chemical biology reagent development, incorporating this analog can help generate peptide standards and analog series for studying how side-chain hydroxyl substitution affects physicochemical behavior, conformational preferences, or chemical reactivity during handling and downstream assays. The DL mixture is particularly useful for preparing mixed-stereochemistry peptide analogs for comparative analytical studies when stereopurity is not the primary requirement.
3. Analytical Standards And Derivatization
2-Hydroxy-DL-tryptophan is commonly used to develop and validate analytical methods that target tryptophan-like metabolites and indole-containing compounds, including LC-MS workflows that benefit from a structurally related reference. The hydroxyl substituent provides an additional chemical handle for derivatization strategies that can improve detectability, chromatographic behavior, or separation from native tryptophan in complex matrices. Analytical chemistry teams use this compound as a calibration or derivatization control when monitoring hydroxyindole species, supporting method transfer and routine quality checks for metabolite-focused assays.
4. Chiral Chemistry Feedstock
2-Hydroxy-DL-tryptophan serves as a practical starting material for chiral chemistry and intermediate development programs that require access to hydroxytryptophan-derived scaffolds without requiring immediate stereopurity. Process chemists and synthetic method developers use the DL mixture to access hydroxyindole-containing intermediates that can later be resolved, converted, or carried through stereoselective steps depending on the target. This makes it useful for exploratory synthesis campaigns, where rapid generation of candidate intermediates is prioritized before committing to a stereochemically defined endpoint.
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