Fmoc-L-Tyr(PO(OBzl)OH)-OH

Fmoc-L-Tyr(PO(OBzl)OH)-OH is an Fmoc-protected L-tyrosine derivative bearing a phosphorylated side chain in the form of a phosphonic acid monoester, PO(OBzl)OH, where the benzyloxy group provides an acid-labile protecting element on the phosphorus center. The molecule contains a chiral amino acid stereocenter at the α-carbon, a phenolic aromatic ring on the tyrosine side chain, and a phosphonate functionality that introduces strong polarity, hydrogen-bonding capacity, and metal-ion coordination behavior typical of phosphate analogs. The Fmoc group on the α-amine supports standard solid-phase peptide synthesis workflows, while the phosphonate ester/acid combination enables controlled chemoselective transformations during peptide assembly and post-coupling modification. The presence of both benzyl-protected oxygen and a free phosphonic acid moiety makes the compound suitable as a protected phosphotyrosine surrogate and as a downstream intermediate for generating defined phosphorylated motifs in peptide and peptidomimetic scaffolds.

1. Peptide Synthesis

Fmoc-L-Tyr(PO(OBzl)OH)-OH supports peptide building block preparation in solid-phase and solution-phase workflows where N-Fmoc deprotection reveals a reactive amino terminus for peptide coupling. The tyrosine backbone provides a canonical aromatic side chain, while the phosphonic acid monoester on the phenolic region functions as a phosphorylated recognition element that can be carried through coupling steps with appropriate protection of the phosphorus oxygen. Benzyl protection on the phosphonate oxygen can be removed under hydrogenolysis-compatible conditions to yield a defined phosphonic acid state after assembly, enabling staged control of phosphorylation during peptide construction. Downstream peptide products can be used as substrate mimics, signaling motif analogs, and phosphorylation-state controls for biochemical assays and peptide library generation, aligning with amino acid derivative chemistries used in modern peptide synthesis.

2. Chemical Biology

Fmoc-L-Tyr(PO(OBzl)OH)-OH is applicable to chemical biology studies targeting phosphorylation-dependent recognition, where the phosphonic acid monoester provides a stable phosphate-like charge distribution for probing protein-ligand interactions. The stereochemically defined L-tyrosine core positions the aromatic ring and the phosphonate group in a spatial arrangement suitable for molecular recognition studies, while the remaining phosphonic acid functionality enables salt-bridge and hydrogen-bonding interactions with binding-site residues. Fmoc protection allows the compound to be incorporated into longer peptide probes, and the benzyl-protected phosphonate oxygen can be converted to the corresponding free phosphonic acid state to match assay-relevant phosphorylation patterns. The resulting phosphorylated peptide analogs can serve as tunable tools for mapping binding specificity, studying kinase/substrate recognition features, and generating defined chemical probes for mechanistic investigations in amino acid and peptide chemistry.

3. Bioconjugation Chemistry

Fmoc-L-Tyr(PO(OBzl)OH)-OH can be employed in bioconjugation strategies that require site-defined phosphate-mimetic handles for attaching peptides to biomolecules or surfaces while maintaining controlled functional group exposure. The phosphonic acid moiety provides a strong anionic functionality that can participate in coordination-based capture, electrostatic association, or selective coupling after appropriate activation, while the benzyl-protected oxygen enables staged deprotection to regulate conjugation timing. The Fmoc group supports incorporation into peptide linkers, allowing the phosphotyrosine-like motif to be presented at a defined position within a conjugate architecture. Downstream conjugates can be used for biomolecule labeling, affinity reagent construction, and analytical probe preparation where the phosphorylation state and stereochemical integrity of the amino acid building block influence binding and signal readout.

4. Peptidomimetics And SAR

Fmoc-L-Tyr(PO(OBzl)OH)-OH serves as a chiral intermediate for peptidomimetic construction in structure-activity relationship studies where phosphate-mimetic side chains modulate receptor or enzyme recognition. The tyrosine aromatic ring can be retained to preserve hydrophobic and π-interaction features, while the phosphonic acid monoester provides a tunable polar pharmacophore that can be converted to a fully deprotected phosphonic acid form to match the intended electrostatic profile. Fmoc-based N-protection supports sequential assembly of analog series, enabling systematic variation of neighboring residues while holding the phosphonate motif constant. Resulting peptidomimetics and analog libraries can be used to interrogate how phosphorylation-state geometry and stereochemistry affect binding selectivity, supporting iterative medicinal chemistry and amino acid derivatization workflows.

5. Process Chemistry Intermediate

Fmoc-L-Tyr(PO(OBzl)OH)-OH is suitable as a manufacturing-oriented intermediate for producing protected phosphotyrosine-containing peptide building blocks and phosphorylated peptide fragments at scale. The Fmoc group provides a robust, widely compatible N-protection strategy for controlled deprotection and coupling, while the benzyl-protected phosphonate oxygen offers a chemically manageable orthogonal handle that can be removed after peptide assembly to deliver a consistent phosphorylation-state product. The molecule's defined stereochemistry reduces ambiguity in downstream peptide synthesis and minimizes the risk of epimerization-related impurities during manufacturing steps that involve base-mediated Fmoc removal and coupling chemistry. Industrially relevant downstream outputs include phosphorylated peptide reagents, process intermediates for fine chemical synthesis, and standardized chemical biology materials where reproducible functional group presentation is required for downstream derivatization and analytical characterization.

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