H-D-Tyr(PO3H2)-OH

H-D-Tyr(PO3H2)-OH is a deuterated, D-configuration tyrosine derivative bearing a phosphonic acid substituent on the aromatic side chain. The molecule retains the amino acid backbone with a free carboxylic acid and a phenolic ring modified to a highly polar phosphonate, producing strong hydrogen-bonding capacity and pronounced ionic character across a broad pH range. The D stereochemistry at the α-carbon supports stereochemically defined incorporation into peptide and peptidomimetic frameworks where non-L amino acid geometry is required for resistance to proteolysis or for stereochemical probing. The phosphonic acid group can participate in metal coordination and can undergo controlled derivatization or protection to enable coupling-compatible chemistry, making the compound a practical chiral amino acid intermediate for downstream synthetic routes.

1. Peptide Synthesis

H-D-Tyr(PO3H2)-OH is applied in peptide building workflows where a stereodefined, phosphonate-bearing aromatic residue is needed for phosphotyrosine-mimicking sequences. The amino acid backbone supports standard peptide coupling chemistry, while the phosphonic acid functionality can be protected or temporarily masked to prevent side reactions during amide bond formation. Deuterium labeling at the α-position can be leveraged for mechanistic studies of coupling, cleavage, or enzymatic processing, since isotopic substitution can shift analytical signals without changing the core residue identity. Downstream, the resulting protected residue can be incorporated into peptide chains to generate phosphorylation-state analogs and side-chain constrained constructs for biochemical research.

2. Chemical Biology Research

H-D-Tyr(PO3H2)-OH supports chemical biology studies targeting phosphotyrosine recognition motifs and kinase-associated binding pockets. The phosphonic acid group provides a stable, anionic phosphate mimic that can engage protein residues through electrostatic interactions and hydrogen-bond networks, while the D-tyrosine stereochemistry enables selective interrogation of stereochemical requirements in binding and processing. The preserved phenyl framework allows aromatic positioning comparable to tyrosine-based motifs, and the free carboxylic acid enables conversion into coupling-ready derivatives for scaffold assembly. Resulting peptide analogs and small-molecule conjugates can be used as tools to map interaction determinants and to validate structure-based hypotheses in amino acid derivatization and phospho-mimetic design.

3. Bioconjugation Chemistry

H-D-Tyr(PO3H2)-OH is suitable for bioconjugation strategies that require a charged, phosphonate-bearing handle for controlled attachment to biomolecules. The phosphonic acid can be used to generate protected phosphonate intermediates that survive coupling conditions and then be deprotected to restore the anionic functionality for subsequent binding or recognition behavior. The amino acid backbone enables formation of amide or ester linkages to linkers, surfaces, or carrier proteins, while the D stereocenter can help distinguish the conjugate from native L-tyrosine derivatives in analytical tracking. Downstream products include phosphonate-functional probes, affinity reagents, and labeled amino acid conjugates that integrate amino acid chemistry with biomolecule modification workflows.

4. Peptidomimetics And SAR Studies

H-D-Tyr(PO3H2)-OH is employed in peptidomimetic construction and structure-activity relationship studies where phosphotyrosine-like geometry and charge distribution are central to molecular recognition. The phosphonic acid substituent acts as a persistent phosphate mimic, and the aromatic ring supports stacking and spatial orientation relative to protein binding sites. D-configuration at the α-carbon can be used to tune conformational preferences and protease stability, enabling SAR comparisons between stereochemical variants and side-chain phosphorylation analogs. The compound's functional groups also support iterative derivatization toward constrained analogs, linker-modified scaffolds, and library members used to correlate amino acid stereochemistry and phosphonate chemistry with binding outcomes.

5. Pharmaceutical Intermediate Preparation

H-D-Tyr(PO3H2)-OH serves as a chiral amino acid intermediate for manufacturing routes that require phosphonate-containing building blocks for drug-like scaffolds. The phosphonic acid group can be transformed into coupling-compatible protected forms to manage reactivity during synthesis of amide-linked fragments, while the carboxylic acid enables conversion to activated intermediates for controlled assembly. Deuterium labeling at the α-position can be carried through to final intermediates when isotopic labeling is needed for analytical traceability, impurity profiling, or metabolic stability studies. Downstream, the residue can be incorporated into larger phosphonate-rich molecules, supporting fine chemical synthesis and process chemistry development for phosphonate-bearing active ingredient candidates and related intermediates.

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