Fmoc-Tyr(PO3Me2)-OH

Fmoc-Tyr(PO3Me2)-OH is an Fmoc-protected tyrosine derivative bearing a side-chain phosphonate ester, specifically a dimethyl phosphonate substituent on the phenolic ring (tyrosine phenoxy phosphonate). The molecule combines an aromatic phenol-derived functionality with a stereochemically defined amino acid backbone, while the N-terminus is masked by the fluorenylmethoxycarbonyl (Fmoc) protecting group to support controlled peptide coupling. The phosphonate ester introduces an anionic, strongly polarizable motif that can participate in coordination chemistry and can be transformed into alternative phosphate/phosphonate states under standard inorganic or protecting-group chemistries. The presence of the protected amine, the carboxylic acid, and the electron-rich aromatic side chain makes the compound a practical chiral amino acid intermediate for peptide building block preparation and downstream functional group engineering.

1. Peptide Synthesis

Fmoc-Tyr(PO3Me2)-OH is applied in solid-phase peptide synthesis and peptide fragment assembly where an aromatic phosphonate-containing tyrosine residue is required for phosphorylation-mimetic or phosphate-binding motif studies. The Fmoc group enables stepwise N-terminal deprotection and coupling, while the free carboxylic acid supports amide bond formation using standard peptide coupling chemistries compatible with protected amino acids. The side-chain phosphonate ester can remain intact during peptide chain elongation, allowing incorporation of a defined polar handle into the growing sequence without requiring immediate side-chain modification. The resulting phosphonate-bearing peptides can be used as research-grade constructs for mapping recognition features, tuning charge distribution, and generating sequence-defined analogs for further chemical transformations.

2. Chemical Biology

Fmoc-Tyr(PO3Me2)-OH is suitable for chemical biology workflows that require controlled installation of phosphate-like functionality on tyrosine scaffolds for binding studies and mechanistic investigations. The dimethyl phosphonate ester provides a stable, oxygen-rich group that can mimic aspects of phosphorylated tyrosine charge density while maintaining synthetic controllability relative to labile phosphate forms. The aromatic ring and phosphonate-bearing phenoxy arrangement can support specific interactions with protein pockets that recognize phospho-motifs, enabling structure-activity relationship studies through systematic residue placement. The Fmoc-protected amino acid format supports preparation of defined peptide probes and conjugation-ready intermediates for biochemical assays and molecular recognition experiments.

3. Peptidomimetics

Fmoc-Tyr(PO3Me2)-OH functions as a chiral building block for peptidomimetic construction where phosphate-mimicking side-chain chemistry is embedded into peptide-like backbones. The compound's tyrosine-derived aromatic core provides a rigid scaffold for conformational bias, while the phosphonate ester introduces a polar functional group that can be carried through peptide assembly to create analogs with altered hydrogen-bonding and metal-coordination behavior. The protected N-terminus supports iterative assembly of peptidomimetic sequences, and the phosphonate motif can be further derivatized after synthesis to access alternative phosphate/phosphonate states or to enable additional conjugation handles. Downstream peptidomimetic libraries prepared from this amino acid intermediate can be applied to fragment-based molecular design and SAR studies focused on charge distribution and binding-site complementarity.

4. Bioconjugation Chemistry

Fmoc-Tyr(PO3Me2)-OH is used in bioconjugation and biomolecule modification strategies where a phosphate-like group is needed for targeted labeling chemistry or affinity-based capture. The phosphonate ester can serve as a defined, oxygen-rich functional element that can participate in coordination or electrostatic interactions, supporting conjugate design that relies on controlled polar surface features. The Fmoc-protected amino acid can be incorporated into peptide linkers or spacer segments, yielding conjugation-ready constructs with a stable side-chain motif that can survive typical linker assembly conditions. The resulting phosphonate-containing peptide conjugates may be employed to generate analytical probes, affinity reagents, or engineered biomolecule scaffolds for downstream characterization and functional studies.

5. Process Chemistry Intermediate

Fmoc-Tyr(PO3Me2)-OH is relevant to process chemistry and fine chemical synthesis as a protected amino acid intermediate enabling reproducible manufacturing of peptide building blocks with a pre-installed phosphonate functionality. The Fmoc-protected amine and carboxylic acid provide clear functional handles for scalable peptide coupling steps, while the dimethyl phosphonate ester offers a protected form of phosphate-like chemistry that can be carried through controlled synthetic sequences. The aromatic tyrosine framework supports predictable derivatization and minimizes ambiguity in side-chain functional group placement during manufacturing route design. The compound can be employed to prepare consistent lots of phosphonate-bearing amino acid residues for industrial peptide production, including research-grade and specialty chemical manufacturing where side-chain polarity must be introduced with structural precision.

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