Boc-L-Tyr(3,5-I2)-OH

Boc-L-Tyr(3,5-I2)-OH is a protected L-tyrosine derivative bearing a Boc-protected amino group and iodine substitution at the 3 and 5 positions on the phenolic ring. This aryl iodination pattern is commonly leveraged to introduce heavy-atom content for radiolabeling workflows, isotope-aware analytical studies, and specialized peptide or intermediate synthesis where the iodinated tyrosine side chain must be carried through downstream steps. The protected amino functionality and phenolic substitution make it a practical building block for controlled incorporation into peptide sequences and for preparing iodinated tyrosine-containing intermediates.

1. Iodinated Peptide Building Block

Boc-L-Tyr(3,5-I2)-OH is used by peptide chemists to assemble peptides that contain an iodinated tyrosine residue, particularly when the iodinated aromatic ring must be retained for later derivatization or labeling strategies. The Boc-protected amino group supports its use as a protected amino acid building block in peptide synthesis workflows, enabling incorporation of the 3,5-diiodophenyl side chain at a defined position within a peptide sequence. Researchers developing iodinated peptide standards, side-chain-modified peptide libraries, and specialized tyrosine-containing constructs often select this derivative to ensure the heavy-atom substitution pattern is introduced early and preserved through peptide assembly and purification.

2. Radiolabeling Precursor Development

Boc-L-Tyr(3,5-I2)-OH is frequently selected as a precursor for downstream iodine-based labeling approaches in chemical biology and radiochemistry development programs. The 3,5-diiodo tyrosine motif provides a defined iodinated phenolic aromatic framework that can be carried into labeling or further functionalization steps where iodine content and positional substitution are important. Pharmaceutical intermediate developers and labeling-method teams use this protected derivative to prepare iodinated tyrosine-containing intermediates in a controlled manner, supporting reproducible downstream conversion to labeled or derivatized tyrosine species used for tracing, assay reagent preparation, or method development.

3. Analytical Standard and Method Support

Boc-L-Tyr(3,5-I2)-OH is also used to prepare iodinated tyrosine-containing reference materials for analytical method development and instrument calibration workflows. In LC-MS and related analytical studies, iodinated aromatic amino acid derivatives provide strong mass and characteristic ionization behavior that can help define retention and response for tyrosine analogs with defined iodine substitution. Analytical laboratories and method-development groups use this building block to generate standards, validate sample processing, and support identification workflows for peptides or fragments containing the 3,5-diiodophenyl tyrosine motif.

4. Iodinated Tyrosine Intermediate Synthesis

Boc-L-Tyr(3,5-I2)-OH serves as a practical intermediate for producing a range of iodinated tyrosine derivatives used in specialty chemical synthesis and downstream materials or probe development programs. The combination of Boc protection and the 3,5-diiodo phenolic framework allows chemists to manage reactivity during intermediate transformations while maintaining the iodinated aromatic pattern that defines the target derivative. Teams working on custom iodinated building blocks, side-chain-modified tyrosine reagents, and iodinated aromatic intermediates often choose this compound to ensure the protected amino functionality and the heavy-atom substitution pattern are aligned with their subsequent synthetic or derivatization steps.

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