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

H-L-Tyr(Bzl)-OBzl*HCl is a protected L-tyrosine derivative in which the α-amino group is blocked as an N-protected amino acid (H-L- indicates the amino functionality is present in a controlled salt form), the phenolic hydroxyl is benzyl-protected as Tyr(Bzl), and the carboxyl group is esterified as an OBzl group, with the overall material present as a hydrochloride salt. The molecule therefore contains a stereogenic center consistent with L-configuration, an aromatic phenyl ring bearing a benzyl-protected phenoxy substituent, and multiple benzylic protecting motifs that modulate polarity and reactivity during peptide coupling. The benzyl ester and benzyl ether protection pattern supports orthogonal deprotection logic under hydrogenolysis conditions, while the HCl salt form improves handling of the amino functionality for downstream synthetic steps. The resulting reactivity profile aligns with protected amino acid ester chemistry and peptide building block preparation, where controlled deprotection can reveal tyrosine functionality for later conjugation or side-chain functionalization.

1. Peptide Synthesis

H-L-Tyr(Bzl)-OBzl*HCl supports peptide coupling workflows in peptide synthesis and protected amino acid building block preparation by combining a protected tyrosine side chain with an esterified carboxyl group that can participate in acyl transfer strategies when converted to an activated carboxyl equivalent. The L-configuration at the α-carbon provides stereochemical fidelity for incorporation into peptide sequences, while the benzyl-protected phenolic oxygen helps prevent side reactions such as phenolic acylation or undesired oxidative coupling during chain assembly. The benzyl ester motif can be removed or transformed at a later stage to enable C-terminal unveiling or further derivatization, aligning with iterative peptide construction and analog generation. Downstream, the compound can be used to generate tyrosine-containing peptide segments and protected peptide intermediates suited for stepwise deprotection and final product formation.

2. Side-Chain Functionalization

H-L-Tyr(Bzl)-OBzl*HCl is suited for side-chain functionalization strategies in chemical biology and synthetic organic chemistry because the tyrosine phenolic group is masked as a benzyl ether (Tyr(Bzl)) during early-stage synthesis. The protected phenoxy oxygen reduces competing nucleophilicity while maintaining the aromatic ring as a stable scaffold for later transformations after deprotection, enabling access to free phenol for conjugation, selective derivatization, or controlled crosslinking chemistries. The benzyl ester at the carboxyl terminus supports staged unveiling of the acid functionality for subsequent coupling to linkers, handles, or electrophiles. After orthogonal deprotection, the exposed tyrosine side chain can be leveraged to generate phenol-bearing peptide analogs and aromatic-functional biomolecule derivatives used in structure-activity relationship studies and molecular recognition experiments.

3. Bioconjugation Chemistry

H-L-Tyr(Bzl)-OBzl*HCl can be applied to bioconjugation and biomolecule modification workflows where tyrosine-derived aromatic handles are required for controlled attachment chemistry. The benzyl-protected phenolic oxygen helps maintain chemoselectivity during preparation of peptide or linker fragments, limiting premature phenol reactivity while the amino acid ester form supports incorporation into conjugation-ready intermediates. The L-tyrosine stereochemical definition enables consistent spatial orientation when the fragment is incorporated into larger constructs such as peptide tags, affinity ligands, or multivalent scaffolds. The hydrochloride salt form can facilitate handling of the amino functionality during fragment assembly, and subsequent deprotection can reveal phenolic groups for attachment chemistries that depend on phenol nucleophilicity or electrophile compatibility. This makes the compound relevant to downstream derivative formation for chemical biology tool generation and applied biomolecule labeling.

4. Process Chemistry Intermediate

H-L-Tyr(Bzl)-OBzl*HCl is relevant to process chemistry and fine chemical synthesis as a protected tyrosine ester intermediate designed for manufacturing-compatible protection/deprotection sequences. The benzyl protecting groups on both the phenolic oxygen and the carboxylate provide a stable, isolable protection pattern that can withstand conditions encountered during peptide building block preparation and intermediate handling. The presence of the HCl salt form supports reproducible material handling and can improve consistency of downstream coupling operations where amino functionality is required in a defined protonation state. The stereochemically defined L-configuration reduces variability in downstream peptide or peptidomimetic synthesis, while the benzylic groups can be removed in a controlled manner to deliver tyrosine-containing products at defined stages of a synthetic route. As a result, the compound can serve as a practical intermediate for producing protected amino acid fragments used in industrial peptide manufacturing and specialty chemical production streams.

5. Analytical Standards

H-L-Tyr(Bzl)-OBzl*HCl can be employed in analytical research and method development as a chemically defined, protected tyrosine reference material for monitoring derivatization steps and deprotection endpoints. The combination of benzyl ether and benzyl ester functionalities creates characteristic chromatographic and spectroscopic signatures that can help distinguish protected versus deprotected tyrosine species in complex peptide or intermediate mixtures. The defined L-stereochemistry supports stereospecific analytical discrimination when chiral separations or stereochemical integrity checks are required for peptide building block quality control. The hydrochloride salt form can further assist in standardizing sample preparation for LC-MS or other analytical workflows that are sensitive to ionization state. This analytical utility extends to verifying intermediate formation in amino acid ester synthesis, protected amino acid chemistry, and peptide coupling chemistry, supporting reliable downstream synthetic decision-making.

1. An Open-label, Single-center, Safety and Efficacy Study of Eyelash Polygrowth Factor Serum

2. Zeta-potential-changing nanoparticles conjugated with cell-penetrating peptides for enhanced transfection efficiency

3. Extended exenatide administration enhances lipid metabolism and exacerbates pancreatic injury in mice on a high fat, high carbohydrate diet

4. The spatiotemporal control of signalling and trafficking of the GLP-1R

5. Quantitative Analysis of Ligands Effects on Bioefficacy of Nanoemulsion encapsulating Depigmenting Active