Fmoc-N-Me-Thr-OH

Fmoc-N-Me-Thr-OH is an Fmoc-protected, N-methylated threonine derivative featuring a chiral α-carbon and a side-chain hydroxyl group that can participate in hydrogen bonding and selective functional group transformations. The molecule contains an Fmoc carbamate on the nitrogen, a carboxylic acid handle for peptide coupling, and an N-methyl substituent that modulates amide formation kinetics and conformational preferences in the resulting peptide backbone. Stereochemical integrity at the threonine center supports stereodefined peptide assembly, while the unprotected side-chain alcohol enables orthogonal protection or direct derivatization depending on the coupling sequence. As a protected amino acid building block, it behaves as a reactive carboxylic acid for standard peptide bond formation under Fmoc/tBu-compatible strategies, while the N-methyl functionality supports access to N-methylated peptide motifs and peptidomimetic scaffolds.

1. Peptide Synthesis

Fmoc-N-Me-Thr-OH supports Fmoc-based solid-phase peptide synthesis and solution-phase peptide coupling workflows where an N-methylated threonine residue is required. The Fmoc carbamate provides orthogonal N-protection that can be removed under base conditions to expose the secondary amine for amide bond formation, while the carboxylic acid enables coupling to activated amino acid derivatives or resin-bound growing chains. The N-methyl group influences peptide backbone conformation and can be used to tune local sterics and hydrogen-bonding patterns in the assembled sequence, including N-methyl amide formation at the threonine position. The side-chain hydroxyl can be protected or functionalized to control chemoselectivity during subsequent steps, enabling downstream synthesis of N-methylated peptide analogs and sequence-defined peptidomimetics.

2. Peptidomimetics And SAR Studies

Fmoc-N-Me-Thr-OH is suitable for medicinal chemistry research focused on structure-activity relationship studies and peptidomimetic construction where N-methylated amide linkages are used to modulate conformation and proteolytic stability. The chiral threonine stereocenter and the side-chain hydroxyl provide stereodefined spatial features for molecular recognition, while the N-methyl substitution can alter amide rotational freedom and intramolecular hydrogen-bonding potential. Fmoc protection enables incorporation into longer scaffolds with controlled deprotection/coupling cycles, supporting systematic library synthesis of analogs that vary at the threonine position. The resulting N-methyl threonine-containing peptides can serve as defined fragments for SAR mapping, fragment refinement, and conformational studies in amino acid chemistry-driven optimization campaigns.

3. Side-Chain Functionalization

Fmoc-N-Me-Thr-OH can be applied to side-chain functionalization strategies that leverage the free threonine hydroxyl for orthogonal derivatization after peptide assembly or during intermediate preparation. The molecule's protected amine as an Fmoc carbamate allows selective manipulation of the alcohol functionality without disrupting the peptide coupling handle, while the carboxylic acid enables conversion into activated derivatives for subsequent coupling or immobilization. The N-methylated backbone element can be carried through to maintain the desired amide environment while the side-chain hydroxyl is transformed into ethers, esters, or other oxygen-linked motifs to tune polarity and binding interactions. Downstream products can include hydroxyl-functional peptide analogs for chemical biology probes, affinity reagents, or intermediate substrates for further synthetic elaboration.

4. Chemical Biology Probes

Fmoc-N-Me-Thr-OH supports chemical biology workflows that require chemically defined, stereopure amino acid residues for probe construction and biomolecular labeling strategies. The Fmoc-protected amino acid format enables controlled incorporation into peptide tags, enabling attachment of threonine-based motifs that present a hydroxyl handle for conjugation chemistry or for installing reporter groups. The N-methylated amide can improve resistance to enzymatic cleavage in peptide-based probes, while the chiral center preserves stereochemical information relevant to molecular recognition by binding partners. The resulting labeled or conjugatable peptides can be used to generate detection reagents, affinity handles, or mechanistic probes where amino acid derivatization and peptide coupling compatibility are central to reproducible probe synthesis.

5. Pharmaceutical Manufacturing Intermediate

Fmoc-N-Me-Thr-OH is applicable as a process-relevant intermediate for manufacturing of N-methylated peptide building blocks and peptide intermediates used in pharmaceutical-grade fine chemical supply chains. The Fmoc protection pattern aligns with widely used Fmoc/tBu peptide synthesis logic, where predictable deprotection and coupling steps support scalable route design for producing defined amino acid sequences. The presence of a carboxylic acid and an Fmoc-protected, N-methylated amine enables conversion into activated coupling forms or direct incorporation into peptide intermediates during controlled manufacturing campaigns. The side-chain hydroxyl supports orthogonal protection planning for downstream peptide assembly, facilitating consistent formation of sequence-defined N-methyl threonine-containing products and enabling reliable intermediate preparation for industrial peptide production.

6. Analytical Research Standards

Fmoc-N-Me-Thr-OH can be employed in analytical research to generate reference materials for method development in peptide analysis and amino acid derivative characterization. The defined stereochemistry at the threonine α-carbon and the N-methylated amide structure provide a structural signature that can be tracked by chromatographic and mass spectrometric methods when monitoring peptide coupling, deprotection efficiency, or side-chain derivatization outcomes. The Fmoc group enables straightforward incorporation into peptide standards that reflect real synthesis conditions, while the carboxylic acid functionality supports preparation of calibration-related derivatives and coupling controls. Downstream, the compound can serve as a starting point for constructing standard peptides or fragments that reflect N-methyl threonine chemistry, supporting robust analytical verification across peptide synthesis and amino acid derivatization workflows.

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