N-Me-D-Tyr-OH is an N-methylated D-form tyrosine derivative bearing a phenolic side chain (4-hydroxybenzyl) and a carboxylic acid functional group, classifiable as a modified, non-proteinogenic amino acid analogue with an N-substituted amino terminus. The molecule contains an amide-forming N-methyl substituent on the amino group, a free phenol on the aromatic ring, and a stereogenic center consistent with the D configuration as indicated by the name. N-Me-D-Tyr-OH is used in peptide chemistry and chemical biology workflows to introduce a tyrosine-like aromatic hydroxyl side chain while modulating backbone nitrogen reactivity and conformational properties, including studies of structure-activity relationships and the preparation of labeled or substituted peptide intermediates.
N-Me-D-Tyr-OH is a D-configured, N-methylated tyrosine derivative that retains the phenolic side chain characteristic of tyrosine while presenting a carboxylic acid suitable for peptide coupling chemistry. The stereogenic center at the amino-acid backbone provides defined D-chirality, which can be used to control conformational preferences and protease recognition patterns in peptide and peptidomimetic scaffolds. N-methylation converts the α-amino functionality into a secondary amide-like nucleophile during coupling workflows and can influence hydrogen-bonding capacity and reaction selectivity. The free carboxylic acid and phenolic hydroxyl enable downstream transformations such as esterification, protection/deprotection, and side-chain derivatization for synthetic intermediate preparation and structure-function studies.
1. Peptide Synthesis
N-Me-D-Tyr-OH supports peptide building workflows where D-tyrosine incorporation is required to tune backbone stereochemistry and peptide stability. The N-methylated amino acid form participates in amide bond formation while the phenolic hydroxyl can be managed through protection strategies to prevent competing side reactions during coupling. The defined D-configuration enables stereochemical control in sequential peptide assembly, including fragment coupling and late-stage incorporation of the tyrosine residue. The resulting peptide products can be used as research-grade substrates for biochemical assays and as peptidomimetic scaffolds where altered proteolytic susceptibility is a synthetic design target.
2. Side-Chain Functionalization
N-Me-D-Tyr-OH is suitable for side-chain functionalization strategies that exploit the tyrosine phenolic hydroxyl for selective derivatization. Phenolic reactivity can be directed toward O-alkylation, O-acylation, or conversion into handles for further conjugation while the carboxylic acid enables controlled activation for intermediate formation. N-methylation helps modulate amide hydrogen-bonding and can affect the stability of activated derivatives during downstream transformations. Functionalized tyrosine derivatives derived from N-Me-D-Tyr-OH can serve as intermediates for molecular probes, enzyme-binding studies, and scaffold diversification in fine chemical synthesis.
3. Chemical Biology Probes
N-Me-D-Tyr-OH can be applied in chemical biology research to generate D-amino-acid-containing probes that probe binding-site interactions involving aromatic and phenolic recognition. The phenyl ring and phenolic hydroxyl provide a platform for aromatic stacking and hydrogen-bonding interactions, while D-chirality can be used to modulate cellular processing and protease susceptibility in probe design. N-methylation changes local conformational behavior and reduces donor capacity at the backbone nitrogen, which can be leveraged when designing ligands for receptor mapping or enzyme interaction studies. Probe derivatives prepared from this amino acid can be advanced into labeled or functionalized molecular tools for mechanistic investigations and SAR-oriented optimization.
4. Peptidomimetics And SAR
N-Me-D-Tyr-OH is relevant to peptidomimetic construction where stereochemical inversion and backbone N-methylation are used to tune conformational ensembles and intermolecular interactions. The combination of D-configuration and N-methylation can influence torsion angles and hydrogen-bond patterns, while the tyrosine phenol provides a persistent aromatic/oxygen motif for binding interactions. The free carboxylic acid supports conversion into activated intermediates for incorporation into larger analogs or for generating libraries of amino acid derivatives. Peptidomimetic series derived from N-Me-D-Tyr-OH can be used in structure-activity relationship studies to correlate stereochemistry and side-chain chemistry with binding or recognition outcomes in biochemical screening workflows.
5. Pharmaceutical Intermediate Preparation
N-Me-D-Tyr-OH can serve as a chiral amino-acid intermediate for manufacturing routes that require D-tyrosine motifs in peptide-like or peptidomimetic active ingredients. The carboxylic acid functionality enables formation of activated esters or coupling-ready derivatives under controlled protection schemes, while the phenolic hydroxyl can be selectively protected to manage chemoselectivity during multi-step synthesis. N-methylation provides a defined backbone modification that can be carried through to final API-like structures and can reduce the number of exchangeable hydrogen-bond donors in the target scaffold. Industrially, derivatives of N-Me-D-Tyr-OH may be employed as building blocks for specialty chemical production and process chemistry intermediate preparation where stereochemical integrity and functional-group compatibility are critical.
6. Analytical Standards
N-Me-D-Tyr-OH is suitable for analytical method development and reference material preparation in studies involving D-amino-acid-containing peptides and tyrosine-modified analogs. The defined D-stereochemistry and N-methylated backbone provide a distinct mass and fragmentation pattern that can support LC-MS or derivatization-based quantitation in peptide degradation, stability testing, and synthetic monitoring. The phenolic hydroxyl and carboxylic acid allow controlled derivatization for chromatography tuning and for generating consistent standards across protection-state variants. Analytical workflows that use N-Me-D-Tyr-OH can improve identification confidence for synthetic intermediates and final peptide building blocks, supporting quality-by-design practices in amino acid derivative manufacturing.
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