H-D-Tyr(All)-OMe*HCl

H-D-Tyr(All)-OMe*HCl is a protected, stereodefined amino acid derivative featuring a deuterated D-tyrosine core with an O-methyl ester (OMe) and a phenolic side chain bearing an allyl substituent (All). The presence of the phenolic O-allyl group provides an orthogonal protection handle for later phenol deprotection, while the ester functionality supports peptide coupling and downstream transformations into carboxylic acid forms. The hydrochloride salt form improves handling of the amino acid ester and helps maintain the amine in a reactive, cationic state for standard coupling chemistries. The combination of D-configuration, deuterium labeling, and protected phenolic oxygen makes the compound suitable for stereochemical control and isotope-enabled analytical or synthetic studies in amino acid and peptide chemistry.

1. Peptide Synthesis

H-D-Tyr(All)-OMe*HCl supports peptide building-block workflows where the O-methyl ester can be converted or used in coupling sequences to assemble tyrosine-containing peptides. The N-terminus is protected as an H-labeled amino acid derivative, while the allyl-protected phenol enables selective side-chain handling during stepwise synthesis. Deuterium incorporation at the tyrosine framework can be retained through peptide assembly to enable mass-shift tracking of incorporation and degradation pathways. Downstream deprotection of the allyl group can furnish a free phenolic side chain for further derivatization or for generating peptides that require native tyrosine functionality.

2. Chiral Isotope Labeling

H-D-Tyr(All)-OMe*HCl is well suited for chemical biology and analytical research requiring a chiral, deuterium-labeled tyrosine surrogate. The D-configuration and labeled backbone provide stereochemically defined material for studies that distinguish enantiomeric behavior in peptide assembly, enzymatic recognition, or metabolic processing. The allyl-protected phenol helps prevent uncontrolled oxidation or side reactions during labeling workflows, while the ester form supports controlled conversion to peptide-ready acid derivatives. The resulting labeled amino acid or peptide analog can serve as an internal standard, tracer, or reference compound for LC-MS/MS method development and stereospecific quantification.

3. Side-Chain Functionalization

H-D-Tyr(All)-OMe*HCl enables side-chain functionalization strategies centered on the phenolic oxygen of tyrosine. The allyl group acts as a removable protecting handle that can be selectively cleared to reveal the phenol for subsequent etherification, esterification, or conjugation chemistry. The O-methyl ester can be employed as a handle for downstream transformations to carboxylic acid derivatives, facilitating incorporation into larger molecular scaffolds or attachment to linkers. Deuterium labeling can further support mechanistic studies by allowing tracking of tyrosine-containing fragments after derivatization and purification.

4. Peptidomimetics And SAR Studies

H-D-Tyr(All)-OMe*HCl can be applied in peptidomimetic construction and structure-activity relationship studies where tyrosine-like aromatic functionality and stereochemistry are key determinants. The protected phenol and ester functionality support modular assembly of analogs that mimic peptide backbones while enabling controlled variation of side-chain chemistry. Allyl protection supports orthogonal manipulation of the aromatic hydroxyl during synthesis of constrained or substituted analogs, including analogs designed for binding-site probing. Deuterium content can assist in differentiating closely related analogs during synthesis and in analytical characterization of SAR libraries.

5. Pharmaceutical Intermediate Preparation

H-D-Tyr(All)-OMe*HCl is suitable for fine chemical synthesis and pharmaceutical intermediate preparation where protected amino acid derivatives are used as controlled feedstocks for downstream coupling and functional group interconversions. The combination of a protected phenolic oxygen and an esterified carboxyl group supports stepwise conversion into carboxylic acid forms, activated derivatives, or peptide coupling-compatible intermediates. The hydrochloride salt form can improve reproducibility in manufacturing-oriented handling of amino acid esters and can facilitate consistent material transfer into subsequent synthetic stages. Deuterated, stereodefined tyrosine derivatives also align with isotope-enabled process development and analytical reference needs in industrial chemical manufacturing contexts.

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