N-Me-Tyr(Me)-OH

N-Me-Tyr(Me)-OH is a methylated tyrosine derivative featuring an N-methylated amino functionality and a phenolic side chain bearing an additional O-methyl substituent, yielding a protected phenolic ether while retaining the carboxylic acid for downstream coupling chemistry. The molecule is built on a chiral amino acid backbone, so its stereochemistry at the alpha-carbon can be used to control stereochemical outcomes during peptide bond formation and in chiral intermediate synthesis. The N-methyl group reduces the nucleophilicity of the amide-forming nitrogen relative to primary amino acids and can influence peptide coupling behavior, while the O-methylated phenol changes hydrogen-bonding and reactivity compared with unprotected tyrosine. As an amino acid-based intermediate, N-Me-Tyr(Me)-OH can participate in protected amino acid synthesis workflows and can be converted into activated derivatives for incorporation into peptide-like structures or for use as a defined chiral fragment in biochemical and analytical studies.

1. Peptide Synthesis

N-Me-Tyr(Me)-OH is applied in peptide synthesis workflows where a tyrosine-derived residue with an N-methylated backbone and O-methylated side chain is required for generating constrained or protease-resistant peptide analogs. The carboxylic acid enables C-terminal activation strategies, while the N-methylated amino group supports incorporation as a defined residue in sequential coupling steps to build peptide chains with controlled stereochemistry. The O-methyl ether protects the phenolic oxygen from side reactions during coupling and subsequent manipulations, allowing the residue to be carried through multi-step synthesis without phenol oxidation or undesired electrophilic aromatic substitution. The resulting peptide products and peptide fragments can be used for structure-activity relationship studies, backbone modification libraries, and mechanistic investigations of peptide recognition.

2. Peptidomimetics And SAR

N-Me-Tyr(Me)-OH is utilized in peptidomimetic and SAR-oriented medicinal chemistry programs that require tyrosine-like aromatic functionality while modulating hydrogen-bonding and conformational preferences. The N-methyl substitution provides a handle for backbone modification, often used to tune amide geometry and reduce the availability of donor/acceptor sites that influence binding interactions. The O-methylated phenol preserves an aromatic ring with altered polarity relative to native tyrosine, which can be leveraged to probe binding site tolerance to side-chain etherification. Incorporation of this chiral amino acid derivative into peptide analogs supports fragment-based scaffold diversification and downstream analog generation for mapping structure-function relationships in biomolecular recognition contexts.

3. Chemical Biology Probes

N-Me-Tyr(Me)-OH is suitable for chemical biology probe construction where tyrosine-derived aromatic motifs are needed with controlled reactivity during labeling or derivatization. The carboxylic acid and N-methylated amino group provide a defined amino acid framework for converting into activated intermediates that can be coupled to targeting scaffolds, reporters, or affinity handles. The O-methyl ether functions as a stable phenolic protection mode, enabling the aromatic side chain to remain intact under conditions that might otherwise activate phenolic oxidation or uncontrolled conjugation. The resulting labeled amino acid derivatives and peptide-like constructs can serve as defined substrates or probes for studying molecular recognition, binding kinetics, or enzyme selectivity in biochemical research settings.

4. Protected Amino Acid Chemistry

N-Me-Tyr(Me)-OH is applied as a chiral amino acid intermediate in protected amino acid synthesis and intermediate preparation strategies for manufacturing peptide building blocks. The N-methylated amino functionality and O-methylated phenol represent built-in protection elements that can reduce the need for additional side-chain protection during early steps of synthesis design. The free carboxylic acid allows conversion to activated forms for coupling, enabling controlled assembly of N-methylated tyrosine residues into larger structures without exposing a free phenol. The stereogenic center supports stereochemically defined downstream products, making the compound useful for process chemistry intermediate preparation and for consistent batch-to-batch synthesis of amino acid derivatives used in fine chemical production.

5. Analytical Standards And Metabolite Studies

N-Me-Tyr(Me)-OH is used to prepare analytical standards and reference fragments for amino acid derivative quantification, impurity profiling, and metabolite-like characterization in research laboratories. The combination of N-methylation and O-methylation produces a distinct mass and fragmentation pattern relative to native tyrosine derivatives, supporting unambiguous identification in LC-MS and related analytical workflows. The intact carboxylic acid enables derivatization into chromatographically compatible forms when needed for method development and calibration. The compound's defined stereochemistry at the alpha-carbon can be leveraged to interpret stereochemical outcomes in synthetic studies, enzymatic transformation experiments, and quality control of peptide-building-block supply chains.

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