L-Threonine is a naturally occurring proteinogenic amino acid with a β-hydroxylated alkyl side chain, classifying it as a polar, uncharged residue in peptide contexts. The molecule contains both an amino group and a carboxyl group, and its stereochemistry is specified as L, with the side-chain hydroxyl enabling hydrogen-bonding and participation in chemical derivatization or phosphorylation-mimetic studies when incorporated into peptides. As a free amino acid building block, L-threonine is used in peptide synthesis and protein engineering workflows where incorporation of a hydroxyl-bearing residue is required for structure-property studies, as well as in analytical method development involving amino acid standards and derivatization-based detection.
CAT No: CP01902
CAS No:72-19-5
Synonyms/Alias:L-threonine;threonine;72-19-5;Threonin;(S)-Threonine;(2S,3R)-2-amino-3-hydroxybutanoicacid;L-(-)-Threonine;2-amino-3-hydroxybutyricacid;Threonine,L-;Threonine(VAN);Threoninum[Latin];Treonina[Spanish];(2S,3R)-2-Amino-3-hydroxybutyricacid;H-Thr-OH;L-Threonin;L-thr;(2S)-threonine;L-alpha-Amino-beta-hydroxybutyricacid;(2S,3R)-(-)-Threonine;L-2-Amino-3-hydroxybutyricacid;Threonine[USAN:INN];[R-(R*,S*)]-2-Amino-3-hydroxybutanoicacid;2-Amino-3-hydroxybutanoicacid,(R-(R*,S*))-;2-Amino-3-hydroxybutyrate;2-Amino-3-hydroxybutanoate
L-Threonine is a naturally occurring L-amino acid with a chiral alpha-carbon bearing a primary amino group and a carboxylic acid, plus a side chain containing a β-hydroxyl substituent that enables hydrogen-bonding and polarity tuning. The molecule's stereochemistry fixes the L-configuration, which influences reactivity in peptide coupling and enzymatic recognition pathways. The presence of both an alcohol and an amino acid functionality makes L-threonine a chemically tractable intermediate for protected amino acid synthesis, side-chain derivatization, and downstream conversion into amide, ester, and carbamate derivatives. L-Threonine's functional group pattern supports selective protection strategies for peptide synthesis compatibility and enables controlled transformations that preserve stereochemical integrity.
1. Peptide Synthesis
L-Threonine is used in peptide building block preparation for solid-phase and solution-phase coupling workflows where the alpha-amino and alpha-carboxyl groups participate in amide bond formation. The side-chain hydroxyl can be protected as an O-alkyl or O-acyl group to prevent undesired reactions during N-protection and peptide assembly, while the L-stereocenter maintains stereochemical fidelity in the growing chain. L-Threonine-based coupling partners can be incorporated at defined positions to introduce hydroxyl-bearing residues that influence solubility, hydrogen-bond networks, and conformational preferences in peptide analogs. L-Threonine also serves as a practical starting point for generating C-terminal or N-terminal modified threonine residues that support fragment coupling and iterative peptide construction for biochemical research and fine chemical synthesis.
2. Side-Chain Functionalization
L-Threonine is applied in amino acid derivatization programs that exploit the β-hydroxyl functionality for selective functional group interconversion. The hydroxyl group can be converted into ethers, esters, carbamates, or activated leaving-group derivatives, enabling attachment of linkers for chemical biology tools, immobilization handles for materials processing, or orthogonally addressable groups for sequential modification. The amino acid backbone provides a stable scaffold for maintaining the L-configuration while the side chain is tuned to alter polarity, reactivity, and binding interactions in peptidomimetic construction. L-Threonine-derived intermediates can be further processed into protected threonine derivatives and downstream building blocks for synthetic organic chemistry and specialty chemical production.
3. Chemical Biology And Protein Engineering
L-Threonine is utilized in chemical biology and protein engineering contexts where residue-level hydroxyl chemistry supports controlled labeling, crosslinking, or substrate mimic design. The combination of an L-amino acid core and a side-chain hydroxyl enables incorporation into peptide probes and protein fragments that participate in hydrogen-bonding-driven recognition events. Protected forms of L-threonine can be incorporated into designed sequences to generate hydroxyl-functional sites that can be selectively modified after assembly, supporting studies of phosphorylation-like motifs, glycomimetic interactions, and enzyme-substrate specificity without requiring modification of the backbone stereochemistry. L-Threonine-based constructs also support SAR studies for hydroxyl-dependent binding motifs and enable generation of analytical standards for monitoring derivatization and conjugation states.
4. Protected Amino Acid Derivatives
L-Threonine is employed as a feedstock for protected amino acid synthesis where orthogonal protection strategies govern chemoselectivity during peptide coupling and subsequent deprotection steps. The amino group and carboxylic acid can be protected as N-protected derivatives and esterified or converted to activated acid forms, while the side-chain hydroxyl is protected to suppress side reactions such as ester exchange or intramolecular cyclization. The L-configuration is preserved through protection and activation steps, providing a reliable chiral amino acid intermediate for manufacturing routes that require consistent stereochemical outcomes. L-Threonine protected derivatives can be used to prepare threonine-containing peptide building blocks, process intermediates for fine chemical synthesis, and reproducible reagents for downstream coupling chemistry in industrial peptide production.
5. Pharmaceutical Intermediate Preparation
L-Threonine is applied as a chiral amino acid intermediate in pharmaceutical manufacturing and process chemistry where hydroxyl-bearing stereodefined fragments are required for building complex amide and ester-containing scaffolds. The alpha-amino and alpha-carboxyl functionalities enable conversion into activated intermediates suitable for coupling reactions, while the β-hydroxyl can be protected to control chemoselectivity during multistep synthesis. L-Threonine-derived derivatives can function as precursors to peptidomimetic motifs and polar side-chain elements that influence solubility and conformational behavior in synthetic targets. L-Threonine-based intermediates support controlled downstream transformations that align with industrial fine chemical synthesis and specialty chemical production requirements for chiral, functionalized building blocks.
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