N-Me-Tyr-OMe · HCl

N-Me-Tyr-OMe · HCl is a hydrochloride salt of an N-methylated tyrosine methyl ester, combining a chiral amino acid core with a phenolic side chain and a protected carboxyl functionality as the methyl ester. The structure features an N-methylated amine that is less prone to direct peptide coupling without further activation or conversion, while the phenolic hydroxyl can participate in electrophilic aromatic substitution, oxidative coupling, or selective protection strategies. The presence of the methyl ester and the salt form influence solubility and handling, making the compound a practical chiral intermediate for downstream conversion into peptide-ready building blocks. Stereochemical integrity at the tyrosine α-carbon supports stereocontrolled incorporation into peptide analogs and other chiral frameworks used in biochemical research and synthetic organic chemistry.

1. Peptide Synthesis

N-Me-Tyr-OMe · HCl is applied in peptide synthesis workflows where tyrosine-derived residues are required as chiral, side-chain-functionalized precursors. The phenolic hydroxyl enables controlled side-chain protection and later deprotection to match peptide coupling conditions, while the methyl ester can be converted to an activated carboxyl derivative for amide bond formation. N-methylation changes the amine reactivity profile, so the amino group can be transformed into a coupling-compatible form or used as a scaffold for N-substitution patterns in peptide analogs. Incorporation into protected amino acid sequences can support systematic evaluation of how N-methylation and tyrosine side-chain chemistry affect conformational preferences and coupling compatibility in synthetic peptide libraries.

2. Peptidomimetics

N-Me-Tyr-OMe · HCl is suitable for peptidomimetic construction and medicinal chemistry intermediate preparation where tyrosine-like aromatic functionality and controlled N-substitution are needed. The N-methylated amine and the methyl ester provide a defined substitution pattern that can be carried through multi-step synthesis to generate amide-rich analogs with tailored backbone properties. The phenolic hydroxyl can be protected as an ether or carbonate to withstand coupling and then selectively unmasked to enable hydrogen-bonding interactions or further derivatization. Downstream conversion of the ester into carboxyl-activated intermediates supports assembly of constrained or N-methylated peptide surrogates for structure-activity relationship studies and fragment-to-lead optimization campaigns.

3. Chemical Biology Labeling

N-Me-Tyr-OMe · HCl is used in chemical biology research for preparing tyrosine-based probes and conjugation handles that rely on aromatic side-chain chemistry. The phenolic hydroxyl can be functionalized into linkers, affinity tags, or reactive intermediates for bioconjugation chemistry, while the ester and salt form can be leveraged to manage solubility during synthesis of labeling reagents. N-methylation allows access to N-substituted amino acid derivatives that may modulate stability against enzymatic cleavage when incorporated into probe scaffolds. Resulting derivatives can serve as intermediates for generating labeled peptides, small-molecule mimics, or analytical standards used to study biomolecular interactions involving tyrosine recognition motifs.

4. Process Chemistry Intermediate

N-Me-Tyr-OMe · HCl is employed as a chiral amino acid intermediate in process chemistry and fine chemical synthesis where tyrosine methyl ester derivatives are routed into larger manufacturing sequences. The methyl ester provides a handle for controlled conversion to carboxylic acid or activated ester forms under conditions compatible with scale-up planning, while the phenolic group can be selectively protected to prevent side reactions during downstream transformations. Salt formation as the hydrochloride can improve handling characteristics in certain synthetic operations by supporting consistent dissolution and crystallization behavior. The defined N-methylated backbone supports reproducible generation of N-substituted tyrosine derivatives used in industrial intermediate supply chains for peptide building block preparation and specialty chemical production.

5. Analytical Research Standards

N-Me-Tyr-OMe · HCl is applicable to analytical research for method development and reference compound preparation involving tyrosine-containing derivatives. The combination of an N-methylated amine, phenolic hydroxyl, and methyl ester creates a distinct set of chromatographic and mass spectrometric signatures that can be used to monitor derivatization steps, ester hydrolysis, or protection/deprotection outcomes in amino acid chemistry workflows. Hydrochloride salt formation can further support consistent ionization behavior in LC-MS or capillary electrophoresis method scouting. Prepared derivatives and related analogs can serve as calibration or qualification materials for characterizing peptide intermediates, ensuring stereochemical and functional group integrity during synthetic campaigns.

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