Fmoc-3,5-Diiodo-D-tyrosine

Fmoc-3,5-Diiodo-D-tyrosine is an Fmoc-protected D-tyrosine derivative bearing two iodine atoms at the 3 and 5 positions of the phenolic ring, creating a heavily halogenated aromatic side chain that is well matched to radiolabeling and iodinated phenyl chemistry. The molecule contains the Fmoc carbamate on the α-amino group and a free carboxylate functionality masked as part of the amino acid framework, enabling controlled peptide coupling after standard deprotection and activation steps. The D stereocenter at the α-carbon provides stereochemical fidelity for peptide analogs and chiral studies, while the iodinated phenol can participate in electrophilic substitution patterns, oxidative transformations, and selective derivatization of the aromatic ring. The dense iodine substitution increases molecular weight and polarizability, which can influence solubility, chromatographic behavior, and downstream analytical detectability in peptide and small-molecule workflows.

1. Peptide Synthesis

Fmoc-3,5-Diiodo-D-tyrosine is applied in peptide building and solid-phase peptide synthesis workflows where iodinated tyrosine residues are required as structural motifs. The Fmoc-protected amino group supports orthogonal deprotection strategies to generate a reactive amine for amide bond formation, while the D-configuration enables incorporation of stereochemically defined peptide segments. The 3,5-diiodo phenolic ring functions as a chemically distinctive side chain that can be retained through coupling steps and later used for iodinated aromatic transformations or analytical tracking. Iodinated peptide products derived from this amino acid derivative can serve as reference standards, mechanistic probes, or scaffold elements in peptide science and peptidomimetic construction. The compound's halogenated aromatic functionality also aligns with synthetic routes that require robust mass-tagging for LC-MS and MS/MS characterization.

2. Radiolabeling And Imaging Probes

Fmoc-3,5-Diiodo-D-tyrosine is suitable for radiochemistry-adjacent research directions where iodinated tyrosine analogs act as precursors or structural surrogates for isotope incorporation. The two iodine substituents on the phenolic ring provide a direct handle for studying iodine chemistry, including retention of iodination patterns during peptide assembly and subsequent functionalization of the aromatic scaffold. The Fmoc-protected backbone supports preparation of iodinated peptide conjugates that can be further modified for labeling strategies, including downstream attachment to targeting motifs or chelator-bearing linkers. The D stereochemistry can be used to probe stereochemical effects on binding, stability, or metabolic-like processing in biochemical assays without invoking native L-tyrosine stereochemistry. This application pathway leverages amino acid derivatization principles to generate iodinated constructs for analytical and tracer-oriented molecular design.

3. Side-Chain Functionalization

Fmoc-3,5-Diiodo-D-tyrosine is utilized in synthetic organic chemistry for side-chain functionalization of iodinated aromatic amino acid derivatives. The 3,5-diiodo phenol pattern enables electrophilic aromatic substitution logic and can potentially undergo selective transformations that preserve the peptide-compatible backbone, such as controlled oxidative or substitution-based modifications on the aromatic ring. The Fmoc carbamate and amino acid framework support staged protection and deprotection, allowing the iodinated side chain to remain intact while the α-functionalities are managed for coupling or conjugation. The resulting derivatized iodinated aromatic residues can be used to build peptidomimetics, generate structure-defined fragments for SAR studies, or create chemically distinct handles for orthogonal attachment chemistries. Downstream utility includes preparation of functionalized peptide analogs and small-molecule intermediates that retain stereochemical control from the D-tyrosine center.

4. Chemical Biology And Protein Engineering

Fmoc-3,5-Diiodo-D-tyrosine is applied in chemical biology contexts where iodinated tyrosine analogs are incorporated into peptide probes to study molecular recognition and post-translational modification-like behavior. The Fmoc-protected amino group enables systematic peptide coupling, while the D-configuration supports experiments that distinguish stereochemical contributions to binding or enzyme interactions. The iodinated aromatic ring can function as a spectroscopic or mass-sensitive element, supporting comparative studies of peptide conformation, interaction strength, and site-specific effects in protein engineering and biomolecular mapping. The phenolic substitution pattern can also be used to create defined analogs that mimic tyrosine-based motifs while altering electronic properties through heavy halogen substitution. This approach supports downstream formation of labeled or structurally constrained peptide segments used for biochemical investigation and molecular scaffold refinement.

5. Pharmaceutical Intermediate Preparation

Fmoc-3,5-Diiodo-D-tyrosine is relevant to pharmaceutical intermediate preparation and fine chemical synthesis where iodinated aromatic amino acid derivatives serve as controlled building blocks for iodinated drug-like scaffolds. The Fmoc-protected amino functionality supports manufacturing-compatible protection strategies that separate amine activation from aromatic iodination chemistry, improving route design for multi-step synthesis. The D-tyrosine stereocenter provides a defined chiral intermediate that can be carried into peptide-like intermediates, linker-bearing fragments, or iodinated aromatic moieties used in medicinal chemistry programs. The 3,5-diiodo substitution pattern supports downstream derivatization routes that require heavy halogen retention for physicochemical tuning and analytical traceability during process development. Utilization in this category aligns with industrial amino acid derivative synthesis where protected amino acid chemistry and iodinated aromatic functional groups must be managed through orthogonal steps.

6. Analytical Research Standards

Fmoc-3,5-Diiodo-D-tyrosine is employed in analytical research for preparing iodinated peptide standards and reference materials used in method development and structural verification. The Fmoc-protected backbone enables consistent incorporation into peptides with defined sequences, and the D stereochemistry supports unambiguous discrimination from L-tyrosine-containing analogs in stereospecific analyses. The dual iodine substitution provides strong mass signatures that facilitate LC-MS detection and improve confidence in site-specific identification of tyrosine-derived fragments. The iodinated phenolic ring can also support derivatization workflows that generate stable analytical readouts for monitoring chemical transformations or coupling efficiency in peptide chemistry. Broader relevance includes supporting downstream synthetic methodology validation where chiral amino acid intermediates with distinctive elemental composition are required for robust analytical confirmation.

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