H-L-Tyr(2,6-Cl2-Bzl)-OH

H-L-Tyr(2,6-Cl2-Bzl)-OH is an L-tyrosine derivative in which the phenolic side chain of tyrosine is protected as a 2,6-dichlorobenzyl ether, while the amino acid backbone remains present as a free carboxylic acid and an unprotected stereogenic center at the alpha-carbon. The molecule therefore combines a chiral amino acid framework with an aromatic side chain bearing two chlorine substituents and a benzylic protecting group that modulates phenolic reactivity. The dichlorobenzyl ether is sufficiently electron-withdrawing to reduce phenol nucleophilicity during peptide coupling and intermediate handling, while the benzyl linkage can be removed under appropriate deprotection conditions to regenerate the tyrosine phenol for downstream conjugation or recognition studies. The presence of a free carboxyl group and a protected phenolic oxygen makes the compound compatible with standard protected amino acid chemistry workflows used in peptide building block preparation and stereochemically controlled synthesis.

1. Peptide Synthesis

H-L-Tyr(2,6-Cl2-Bzl)-OH serves as a tyrosine-based peptide building block for solid-phase or solution-phase peptide synthesis where orthogonal side-chain protection is required. The free carboxylic acid enables amide bond formation at the C-terminus, while the N-terminal amino functionality (as presented in the amino acid derivative) can be managed through conventional coupling strategies compatible with amino acid derivatives bearing protected side chains. The 2,6-dichlorobenzyl ether suppresses phenolic participation in coupling and minimizes side reactions such as undesired O-acylation, allowing incorporation of L-tyrosine residues into longer sequences. Deprotection can restore the native tyrosine phenol for subsequent functionalization, including phosphorylation-mimetic chemistry or attachment of linkers, supporting peptide analog construction and structure-activity relationship studies.

2. Side-Chain Functionalization

H-L-Tyr(2,6-Cl2-Bzl)-OH is suitable for chemical biology and medicinal chemistry workflows that require controlled unveiling of the tyrosine phenolic group from a protected aromatic ether. The dichlorobenzyl protecting group provides a stable, electron-poor aromatic environment that can withstand conditions used for backbone assembly, while the protected oxygen remains available for selective transformation after deprotection. The regenerated phenol can participate in electrophilic aromatic substitution, etherification, esterification, or oxidative coupling reactions to generate tyrosine-derived handles for molecular recognition and conjugation. Downstream derivatives may include biotin-like tags, fluorescent reporter linkers, or affinity reagents, enabling systematic amino acid derivatization and peptidomimetic modification from a chiral amino acid intermediate.

3. Bioconjugation Chemistry

H-L-Tyr(2,6-Cl2-Bzl)-OH can be applied in bioconjugation research where tyrosine phenol functionality is needed to form stable linkages to biomolecules or synthetic scaffolds. The protected phenolic oxygen helps prevent premature conjugation during peptide fragment synthesis, purification, or intermediate derivatization steps that precede attachment to proteins, polymers, or nucleic-acid analogs. The L-configuration at the alpha-carbon preserves the stereochemical identity of the tyrosine residue, which can be relevant for enzymatic processing, receptor binding motifs, or recognition by antibodies and binding domains used in biochemical assays. Deprotection followed by phenol-reactive coupling enables construction of conjugates such as tyrosine-linked probes, antibody labeling reagents, or enzyme substrate analogs for downstream analytical research and molecular scaffold generation.

4. Protein Engineering

H-L-Tyr(2,6-Cl2-Bzl)-OH supports protein engineering and chemical protein modification efforts that rely on tyrosine side-chain chemistry under controlled protection strategies. The amino acid backbone provides a defined chiral unit that can be incorporated into peptide segments used to map epitope regions, design binding interfaces, or generate site-specific modification motifs. The 2,6-dichlorobenzyl ether protects the phenolic oxygen from interfering reactions during fragment assembly, while the dichloro substitution pattern can help maintain side-chain integrity through synthetic steps that would otherwise risk phenol oxidation or uncontrolled derivatization. Restored tyrosine phenol can then be used to introduce functional groups for crosslinking, immobilization, or affinity-tag installation, facilitating applied product development in protein-related chemical biology workflows.

5. Pharmaceutical Intermediate Preparation

H-L-Tyr(2,6-Cl2-Bzl)-OH is relevant to pharmaceutical intermediate preparation and fine chemical synthesis where protected amino acid derivatives are manufactured as controlled building blocks for peptide-like or peptidomimetic structures. The combination of a free carboxylic acid and a protected tyrosine phenol aligns with industrially scalable synthetic logic: selective formation of amide bonds at the backbone while maintaining side-chain protection to control impurity profiles. The benzyl ether protection strategy enables downstream conversion to unprotected tyrosine-derived functionality, which can be carried into subsequent steps such as linker installation, salt formation, or incorporation into larger synthetic intermediates. The chiral amino acid framework and orthogonal side-chain protection make the compound suitable for process chemistry intermediate design and for manufacturing routes that require predictable functional group behavior.

6. Analytical Research Standards

H-L-Tyr(2,6-Cl2-Bzl)-OH can be employed in analytical research as a chemically defined chiral amino acid derivative standard for method development and characterization of tyrosine-containing peptides or protected amino acid intermediates. The presence of the 2,6-dichlorobenzyl ether introduces a distinct aromatic signature and controlled phenolic masking, which can aid chromatographic separation and mass spectrometric identification in workflows that monitor protected side chains. The free carboxylic acid and protected phenol allow generation of related derivatives used as calibration references for peptide coupling studies, deprotection monitoring, or stability assessments of tyrosine-protected building blocks. Incorporation into analytical panels supports robust characterization of amino acid derivatization chemistry and improves traceable interpretation of synthetic intermediate transformations in applied chemical manufacturing and biochemical research pipelines.

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