DL-Thyronine is a free, non-proteinogenic amino acid derivative belonging to the thyronine family, featuring an aromatic ring system bearing a hydroxylated phenolic side chain and a carboxylic acid plus an amino group typical of amino acids. The molecule exists as a racemic mixture (DL), providing both stereochemical forms at the α-carbon, and the phenolic hydroxyl on its aromatic substituent contributes to hydrogen-bonding and acid-base behavior relevant to analytical detection and derivatization. DL-Thyronine is used in chemical biology and peptide-related research contexts where aromatic, hydroxyl-bearing amino acid frameworks are required for substrate studies, structure-activity investigations, or the preparation of labeled and structurally modified amino acid analogues.
CAT No: CP19203
DL-Thyronine is a DL mixture of the amino acid thyronine, corresponding to a chiral amino acid framework bearing a phenolic aromatic ring and an additional side-chain functionality consistent with the thyronine skeleton. The molecule contains both an amino group and a carboxylic acid (or acid-form equivalent), enabling standard amino acid coupling chemistry while the phenolic hydroxyl provides a distinct site for selective protection, oxidation state control, and downstream derivatization. The presence of a stereogenic center gives rise to racemic behavior, which is relevant for experiments requiring defined stereochemistry and for synthetic planning where enantiopure thyronine analogs or stereochemically controlled peptide residues are targeted. The aromatic/phenolic character also supports formation of stable amide and ester derivatives and enables conjugation handles for biochemical research intermediates and analytical standards.
1. Peptide Synthesis
DL-Thyronine is applied in peptide building block workflows where amino acid coupling to form amide bonds is required, and where the phenolic hydroxyl can be managed through protection and later deprotection. The amino acid backbone participates in standard peptide coupling strategies, while the phenolic group can be protected to prevent side reactions such as O-acylation or oxidative transformations during assembly. Racemic stereochemistry can be used for generating mixed stereochemical peptide libraries for structure-activity relationship studies, or as a feedstock for subsequent resolution or conversion to enantiopure derivatives. Downstream, the resulting thyronine-containing peptides and peptide fragments serve as intermediates for studying aromatic/phenolic residue effects on conformation, binding, and proteolytic stability.
2. Amino Acid Derivatization
DL-Thyronine is suitable for amino acid derivatization programs that exploit the carboxylic acid and phenolic hydroxyl to access ester, amide, and ether-linked derivatives. The phenolic hydroxyl enables controlled functional group transformations such as O-alkylation, O-acylation, or conversion to reactive intermediates for conjugation chemistry, while the amino and carboxyl functionalities support formation of stable linkages to scaffolds used in chemical biology. Racemic material supports parallel synthesis of derivative sets where stereochemical effects are assessed alongside functional group changes, including side-chain modification strategies that tune polarity and hydrogen-bonding capacity. Resulting thyronine-based intermediates can be used for method development in amino acid functionalization and for generating chemical probes or analytical reagents.
3. Chemical Biology Probes
DL-Thyronine is used in chemical biology research as an amino acid-derived handle for building molecular probes that incorporate a phenolic aromatic motif and a defined amino acid connectivity. The compound's amino acid functionality enables incorporation into larger constructs through amide formation, while the phenolic hydroxyl can be leveraged for selective labeling chemistries, affinity-tag design, or controlled reactivity under orthogonal protection schemes. Racemic stereochemistry may be applied when probe libraries are screened for binding or recognition patterns without requiring enantiopure control at the residue level. Downstream probe derivatives can function as substrates, competitors, or labeling components in biochemical assays designed to interrogate molecular recognition involving aromatic and hydroxyl-bearing motifs.
4. Analytical Research Standards
DL-Thyronine is applied in analytical research where an amino acid standard is needed to support method validation, chromatographic retention profiling, and mass spectrometric identification of thyronine-related species. The presence of both carboxyl and phenolic hydroxyl groups supports predictable derivatization behavior for improving detectability, while the aromatic/phenolic structure provides characteristic fragmentation patterns useful for LC-MS workflows. Racemic composition is relevant for establishing calibration and for distinguishing enantiomeric species when paired with chiral chromatography or stereospecific derivatization strategies. Thyronine-containing standards and derivative standards derived from DL-Thyronine can also support impurity tracking and stability studies for peptide and small-molecule intermediates.
5. Pharmaceutical Intermediate Preparation
DL-Thyronine is suitable for pharmaceutical intermediate preparation routes that require an amino acid-derived aromatic phenol motif for incorporation into medicinal chemistry scaffolds. The amino acid backbone enables conversion into protected amino acid derivatives or activated intermediates that can be coupled to heteroaryl or carbonyl-containing fragments, while the phenolic hydroxyl can be protected to maintain chemoselectivity during multi-step synthesis. Racemic starting material can be used in process development to generate intermediate sets prior to stereochemical refinement, including downstream resolution to obtain enantiopure thyronine analogs when stereochemistry becomes a critical quality attribute. Resulting derivatives can serve as intermediates for fine chemical synthesis and for producing thyronine-functionalized building blocks used in peptide-like or aromatic hydroxyl-containing molecule classes.
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