L-Thyronine is a proteinogenic amino acid of the tyrosine-derived class, featuring a side chain bearing a phenolic ring substituted with iodine atoms and a hydroxyl group, attached to the α-carbon of the amino acid backbone. The molecule contains a free α-amino group and a free α-carboxyl group, with the aromatic side chain providing a polar phenolic functionality that can participate in hydrogen bonding and electrophilic aromatic substitution under appropriate conditions, while the "L" designation specifies the stereochemical form at the α-carbon. L-Thyronine is used as a defined amino acid building block for peptide synthesis and for preparing labeled or modified peptide analogues in structure-activity and binding studies where aromatic, halogenated side-chain chemistry is relevant.
CAT No: CP19201
CAS No:1596-67-4
Synonyms/Alias:L-thyronine;thyronine;1596-67-4;Desiodothyroxine;O-(4-Hydroxyphenyl)tyrosine;(2S)-2-amino-3-[4-(4-hydroxyphenoxy)phenyl]propanoicacid;b-(p-Hydroxyphenoxy)phenylalanine;beta-(p-Hydroxyphenoxy)phenylalanine;4-(4-hydroxyphenoxy)-L-phenylalanine;O-(4-Hydroxyphenyl)-L-tyrosine;3-(p-[p-Hydroxyphenoxy]phenyl)-L-alanine;AC1NUU6M;UNII-E4QN8G00CV;E4QN8G00CV;SCHEMBL285217;CHEBI:30662;CTK4D0174;HMDB00667;KKCIOUWDFWQUBT-AWEZNQCLSA-N;H-4-(4-Htdroxyphenoxy)-Phe-OH;L-Tyrosine,O-(4-hydroxyphenyl)-;ZINC403598;CT-524;AM83591;NCGC00018260-01
L-Thyronine is an L-configured amino acid with a chiral α-carbon bearing an amino group and a carboxylic acid, and it features a thyroid-mimetic side chain with an iodinated aromatic ring. The molecule's phenolic and carboxylic acid functionalities provide distinct hydrogen-bonding and acid-base behavior that can be tuned through esterification, amide formation, or phenol protection during protected amino acid synthesis. The aromatic iodide and phenol enable chemoselective transformations relevant to side-chain functionalization, while the stereochemical integrity of the L-configuration supports stereodefined incorporation into peptide-like architectures. As a biochemical research intermediate and chiral building block, L-thyronine can be converted into coupling-ready derivatives that participate in peptide coupling chemistry and downstream derivatization for structure-focused studies.
1. Peptide Synthesis
L-Thyronine can be applied in peptide synthesis workflows where amino acid building blocks must couple cleanly under standard peptide coupling conditions, and its α-amino and α-carboxyl groups enable formation of amide linkages. The phenolic hydroxyl and carboxylic acid can be managed through protection-group strategies to prevent side reactions during N-protection, C-terminal activation, and iterative chain assembly. The iodinated aromatic motif can be retained through appropriately mild protecting-group choices, supporting the preparation of thyronine-containing peptide fragments and peptide analogs. L-Thyronine derivatives prepared for coupling can serve as defined stereochemical inputs for peptide building block preparation and for generating peptide libraries used in biochemical research.
2. Chemical Biology Probes
L-Thyronine is suitable for chemical biology research that relies on aromatic, phenolic, and iodine-bearing motifs for molecular recognition and probe design. The phenolic group can be derivatized for linker installation or for controlled conjugation chemistry, while the amino acid backbone supports attachment to carriers through stable amide or ester linkages. The L stereochemistry and side-chain functionality can be leveraged to generate thyronine-like chemical probes for studying binding preferences, receptor interactions, or enzyme processing pathways in vitro. Downstream derivatization from protected amino acid intermediates enables access to labeled or tagged analogs used as biochemical research intermediates in targeted molecular investigations.
3. Side-Chain Functionalization
L-Thyronine can be utilized for side-chain functionalization strategies that exploit the iodinated aromatic ring and phenolic hydroxyl to access diverse thyronine-derived scaffolds. The presence of the phenol enables selective protection/deprotection cycles and subsequent transformations such as ether formation, acylation, or linker attachment for conjugation-ready intermediates. The aromatic iodide can participate in cross-coupling-type synthetic routes to introduce aryl substituents or handleable handles for fragment assembly in peptidomimetic construction. Functionalized L-thyronine derivatives can then feed into fine chemical synthesis programs that require chiral amino acid intermediates with preserved stereochemistry.
4. SAR Studies And Molecular Design
L-Thyronine supports structure-activity relationship studies and molecular design efforts where systematic modification of the aromatic substituent pattern and phenolic functionality is needed while maintaining the L-amino acid core. The α-amino and α-carboxyl groups can be converted into protected amino acid derivatives for controlled incorporation into peptide-like frameworks or for generating defined fragments used in SAR workflows. The iodinated aromatic ring provides a chemically informative handle for tuning electronic character and steric profile, while the phenolic hydroxyl can be modulated to probe hydrogen-bonding contributions. L-Thyronine-based analogs prepared through stereodefined chiral intermediate routes can serve as inputs for fragment-based molecular design and for iterative optimization of amino acid-derived scaffolds.
5. Pharmaceutical Intermediate Preparation
L-Thyronine is applicable to pharmaceutical intermediate preparation where chiral amino acid derivatives are required for downstream synthesis of peptide-like or aromatic functional molecules. The amino acid backbone enables conversion into N-protected and C-activated intermediates that participate in amide bond formation under process chemistry conditions, while the phenolic hydroxyl can be protected to ensure chemoselective coupling. The iodinated aromatic motif can be preserved or transformed depending on the target synthetic route, supporting intermediate construction for complex heteroaromatic and aromatic substitutions. L-Thyronine thus functions as a chiral building block for specialty chemical production and for manufacturing-oriented synthesis of thyronine-containing intermediates used in applied product development.
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