H-L-Tyr(Bzl)-OMe*HCl

L-tyrosine benzyl ester hydrochloride, H-L-Tyr(Bzl)-OMe*HCl, is a chiral tyrosine derivative in which the phenolic hydroxyl is protected as a benzyl (Bzl) ether and the carboxyl group is masked as a methyl ester hydrochloride salt. The molecule retains the L-configuration at the α-carbon, enabling stereochemically defined peptide coupling chemistry, while the benzyl-protected phenol provides controlled reactivity during amide bond formation. The methyl ester functionality can participate in ester-based transformations and downstream conversion to carboxyl equivalents, and the salt form improves handling of the amino ester intermediate in synthetic workflows. The combination of an N-protected amino acid framework, a removable O-benzyl group, and an ester that can be hydrolyzed or refunctionalized makes this compound suitable for protected amino acid synthesis and peptide building block preparation.

1. Protected Amino Acid Synthesis

H-L-Tyr(Bzl)-OMe*HCl is used in protected amino acid synthesis workflows where a tyrosine side chain must remain inert during peptide bond construction. The benzyl-protected phenolic oxygen and the methyl ester carboxyl masking strategy allow selective activation of the amino functionality for coupling while preserving the side-chain oxygen for later deprotection. Hydrolysis or ester refunctionalization from the methyl ester can generate carboxyl equivalents for subsequent coupling steps or for conversion into other tyrosine-derived intermediates. Downstream, deprotection of the O-benzyl group enables access to free phenolic tyrosine for incorporation into peptides and for generating phenol-bearing analogs used in biochemical research and synthetic methodology development.

2. Peptide Coupling Chemistry

H-L-Tyr(Bzl)-OMe*HCl serves as a stereodefined peptide building block precursor in peptide coupling chemistry targeting tyrosine-containing sequences. The L-α-amino stereocenter supports formation of amide linkages with defined stereochemistry, while the benzyl-protected phenol minimizes side reactions such as phenolic acylation or oxidative processes during activation and coupling. The methyl ester can be employed as a protected carboxyl handle that can be converted into a C-terminal carboxylate equivalent when the synthetic route requires C-terminal modification or iterative fragment assembly. Resulting peptide analogs and protected intermediates can be advanced for structure-activity relationship studies, peptidomimetic construction, and sequence-specific synthesis where tyrosine side-chain integrity is required.

3. Peptidomimetics And SAR Studies

H-L-Tyr(Bzl)-OMe*HCl is applied in peptidomimetic and SAR studies where controlled tyrosine side-chain presentation is needed for molecular recognition investigations. The phenolic benzyl ether provides a stable, orthogonally removable protecting group that can be retained through multiple synthetic steps and then unveiled to generate phenol-bearing motifs for hydrogen-bonding and aromatic interactions. The methyl ester and amino acid backbone enable conversion into analogs with altered termini, supporting fragment coupling strategies that map side-chain effects onto bioactive scaffolds. Tyrosine-containing derivatives prepared from this intermediate can be used to generate libraries of structure-defined analogs for SAR mapping and molecular design programs in applied chemical research.

4. Chemical Biology Labeling

H-L-Tyr(Bzl)-OMe*HCl supports chemical biology labeling and biomolecule modification strategies that require a protected tyrosine handle during synthesis. The benzyl-protected phenolic oxygen can be carried through conjugation-relevant steps without uncontrolled phenol reactivity, while later deprotection provides access to the native phenol for further functional group installation. The amino acid ester framework can be adapted into activated forms that participate in linker attachment, enabling construction of tyrosine-based probes, affinity tags, or site-selective modification reagents. Downstream derivatives derived from this compound can be used to generate defined labeling tools for protein engineering studies, enzyme substrate analogs, and analytical probe development.

5. Pharmaceutical Intermediate Preparation

H-L-Tyr(Bzl)-OMe*HCl is suitable for pharmaceutical intermediate preparation where protected tyrosine motifs must be assembled with predictable reactivity profiles. The benzyl-protected phenol functions as a protection strategy compatible with common peptide coupling and intermediate transformation conditions, while the methyl ester provides a controllable carboxyl equivalent for process chemistry routes that require staged functional group management. The L-configuration supports stereochemically consistent downstream synthesis of tyrosine-containing building blocks used in active pharmaceutical ingredient (API) fragment construction and synthetic intermediate networks. Resulting products can be advanced into protected amino acid derivatives and tyrosine-functional scaffolds used in fine chemical synthesis and specialty chemical production pipelines.

6. Industrial Fine Chemical Synthesis

H-L-Tyr(Bzl)-OMe*HCl can be employed in industrial fine chemical synthesis and specialty chemical production as a chiral intermediate for tyrosine-based manufacturing routes. The combination of O-benzyl protection and ester masking provides a practical approach to suppress side reactions during scale-up-compatible transformations, while the hydrochloride salt form can improve handling of the amino ester in multi-step processing. The protected phenolic group enables controlled deprotection timing to match downstream coupling or functionalization requirements, supporting manufacturing strategies for peptide building block preparation and chiral precursor supply. Industrially derived tyrosine derivatives from this intermediate can feed into peptide science supply chains, process chemistry intermediate preparation, and production of phenol-bearing amino acid analogs for applied research and industrial manufacturing use.

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