Fmoc-L-Tyr(3-I)-OH

Fmoc-L-Tyr(3-I)-OH is an Fmoc-protected L-tyrosine derivative bearing an iodine substituent at the meta position of the phenolic ring, yielding a chiral, peptide-compatible amino acid building block. The molecule contains an N-terminal fluorenylmethoxycarbonyl (Fmoc) protecting group for base-labile peptide coupling workflows and a free carboxylic acid for controlled C-terminal activation. Side-chain reactivity is governed by the iodinated phenol, which retains hydrogen-bonding and aromatic/halogen electronic effects while remaining suitable for further derivatization or selective functional transformations. The combination of stereochemical integrity at the alpha carbon and the orthogonal protection pattern enables predictable incorporation into peptide sequences and downstream synthetic conversion of the iodinated aromatic motif.

1. Peptide Synthesis

Fmoc-L-Tyr(3-I)-OH supports solid-phase peptide synthesis and fragment coupling strategies where Fmoc deprotection generates a reactive amino group for amide bond formation. The presence of a carboxylic acid enables standard peptide coupling chemistry after activation, while the iodinated tyrosine side chain can be carried through synthesis with minimal disruption to backbone assembly. The phenolic hydroxyl can participate in side-chain protection planning, allowing orthogonal protection schemes when longer sequences require selective deprotection. Incorporation of the meta-iodinated aromatic ring enables construction of radio/halogen-tagged peptide analogs and iodinated pharmacophore scaffolds for subsequent conjugation or analytical studies, aligning peptide science with halogen-functional amino acid design.

2. Chemical Biology

Fmoc-L-Tyr(3-I)-OH serves as a chemical biology building block for generating iodinated tyrosine-containing probes and affinity ligands used to interrogate protein interactions. The Fmoc-protected amino acid format supports incorporation into peptide or peptidomimetic constructs that maintain defined stereochemistry and aromatic side-chain geometry. The iodinated phenolic ring can function as a handle for electrophilic substitution chemistry, halogen-labeled imaging reagents, or controlled derivatization that preserves the phenol's hydrogen-bonding character. Downstream use can include preparation of labeled peptide fragments for binding assays, proteomic workflows that rely on tag-bearing amino acid residues, and mechanistic studies where aromatic halogen substitution influences molecular recognition.

3. Peptidomimetics And SAR

Fmoc-L-Tyr(3-I)-OH is suitable for structure-activity relationship studies and peptidomimetic design where halogen substitution on the tyrosine aromatic ring modulates electronics, polarizability, and binding-site interactions. The alpha-amino acid stereocenter and Fmoc protection enable consistent incorporation into analog libraries with controlled backbone conformation and spacing of the tyrosine side chain. The meta-iodine substituent can be retained as a pharmacophore element or transformed into other functional groups via synthetic conversion, supporting iterative medicinal chemistry campaigns. The phenolic hydroxyl further enables derivatization to ethers, esters, or constrained analogs, enabling systematic exploration of side-chain hydrogen-bonding contributions alongside halogen effects.

4. Bioconjugation Chemistry

Fmoc-L-Tyr(3-I)-OH can be applied to bioconjugation workflows that require peptide-derived linkers bearing an aromatic halogen functionality and a defined tyrosine residue geometry. The Fmoc group supports peptide assembly into carrier peptides or targeting motifs, while the iodinated phenol provides a functional handle for subsequent coupling or substitution chemistry depending on the chosen transformation strategy. The retained phenolic hydroxyl can be protected during assembly and later selectively unmasked or converted to enable controlled attachment points for biomolecule labeling. Downstream derivatives may include iodinated peptide conjugates for affinity capture, imaging reagent synthesis, or modular linker preparation for attaching peptides to proteins, nanoparticles, or polymeric supports.

5. Pharmaceutical Intermediate Preparation

Fmoc-L-Tyr(3-I)-OH is relevant to pharmaceutical intermediate preparation and fine chemical manufacturing where a chiral, protected amino acid with an iodinated aromatic motif is required for downstream medicinal chemistry. The Fmoc-protected amine and free carboxylic acid allow route design that separates peptide-building steps from later functionalization, supporting scalable intermediate handling and controlled conversion. The meta-iodinated tyrosine side chain can be carried into late-stage synthesis as a functional group for diversification, including substitution to other aryl functionalities or incorporation into larger heteroaryl-containing scaffolds. The compound's stereochemical fidelity and orthogonal protection pattern make it compatible with manufacturing-oriented synthesis planning for iodinated amino acid derivatives used in drug discovery and process chemistry pipelines.

6. Analytical Standards And Labeling

Fmoc-L-Tyr(3-I)-OH can be employed in analytical research for preparing iodinated peptide standards, calibration materials, and reference fragments used in chromatographic and spectrometric method development. The defined Fmoc-protected amino acid structure enables consistent synthesis of short peptide sequences containing the meta-iodinated tyrosine residue, improving reproducibility of retention and fragmentation patterns. The iodinated aromatic ring provides a distinctive mass and isotopic labeling compatibility where iodine-containing motifs aid detection and quantitation strategies. Downstream use can include generation of labeled peptide analogs for method validation, impurity profiling, and analytical tracking of peptide coupling outcomes, reinforcing amino acid chemistry as a foundation for robust analytical workflows.

1. Proinsulin C-peptide and insulin: Limited pattern similarities of interest in inter-peptide interactions but no C-peptide effect on insulin and IGF-1 receptor signaling

2. Relatedness of antibodies to peptides containing homocitrulline or citrulline in patients with rheumatoid arthritis

3. Characterization of Novel P-Selectin Targeted Complement Inhibitors in Murine Models of Hindlimb Injury and Transplantation

4. High fat diet and GLP-1 drugs induce pancreatic injury in mice

5. Olfactory receptor based piezoelectric biosensors for detection of alcohols related to food safety applications