Boc-3,5-diiodo-Tyr(3-bromo-Bzl)-OH

Boc-3,5-diiodo-Tyr(3-bromo-Bzl)-OH is a Boc-protected tyrosine derivative bearing two iodine atoms on the aromatic ring (3,5-diiodo) and a 3-bromobenzyl side-chain protecting group. This halogenated, benzyl-protected phenolic tyrosine building block is commonly used in peptide and small-molecule synthesis workflows where dense aromatic halogenation and controlled phenol protection are required for downstream assembly and later functional transformations. The Boc group supports peptide-coupling strategies, while the aryl halogens provide chemically distinctive handles for radiolabeling, electrophilic aromatic substitution chemistry, or selective derivatization in chemical biology and pharmaceutical intermediate development.

1. Halogenated Peptide Building Block

Boc-3,5-diiodo-Tyr(3-bromo-Bzl)-OH is used as a protected tyrosine building block for constructing halogenated peptides and peptide fragments in custom peptide synthesis. Research groups and peptide manufacturers rely on the Boc-protected amino functionality to enable reliable segment coupling while maintaining the phenolic group in a protected state through the benzyl substituent. The 3,5-diiodo substitution pattern is particularly valuable when the target peptide requires a highly halogenated aromatic environment for subsequent derivatization, analytical tagging, or structure-property studies. This derivative is therefore selected when the synthesis plan needs a tyrosine residue that carries both a protected phenol and a pre-installed halogen pattern rather than introducing these features at a later stage.

2. Radiolabeling and Derivatization Intermediates

Boc-3,5-diiodo-Tyr(3-bromo-Bzl)-OH is frequently positioned in chemical development workflows that require halogen-rich aromatic intermediates for radiolabeling or specialized aromatic functionalization. The presence of iodine atoms on the tyrosine ring supports downstream labeling strategies and electrophilic substitution approaches that are difficult to reproduce efficiently from non-halogenated precursors. The 3-bromobenzyl protection pattern also helps manage reactivity during peptide assembly and intermediate handling, enabling controlled conversion to phenolic or further substituted derivatives after key synthetic steps. Medicinal chemistry teams and radiochemistry-oriented laboratories commonly use this type of prefunctionalized amino acid derivative to streamline the preparation of iodinated aromatic motifs embedded in larger scaffolds.

3. Pharmaceutical Intermediate Development

Boc-3,5-diiodo-Tyr(3-bromo-Bzl)-OH serves as a practical intermediate for producing iodinated tyrosine-derived fragments used in pharmaceutical intermediate pipelines. Synthetic chemists value the combination of Boc protection for controlled coupling chemistry and the pre-installed 3,5-diiodo aromatic pattern to reduce late-stage functionalization steps that can be low-yielding or require harsh conditions. The benzyl-protected phenol functionality supports stable intermediate storage and predictable downstream transformations when building larger heteroaromatic or peptide-like structures. This product is therefore selected when an iodinated tyrosine motif must be introduced early in a development route to maintain compatibility with subsequent coupling, purification, and derivatization steps.

4. Chemical Biology Probe Precursors

Boc-3,5-diiodo-Tyr(3-bromo-Bzl)-OH is used to prepare iodinated tyrosine-containing probes and probe precursors for chemical biology investigations that require a distinct aromatic signature. Halogenated aromatic residues can be advantageous for probe tracking, derivatization, and controlled modification workflows where the aromatic ring must retain predefined substitution patterns. Researchers in chemical biology and analytical chemistry often choose this building block when they need a protected tyrosine derivative that can be incorporated into probe scaffolds and then converted into the desired phenolic or further substituted form under planned synthetic conditions. The product's prefunctionalized ring substitution makes it a convenient starting point for building probe variants with consistent aromatic halogenation across a series.

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