Fmoc-D-Tyr(All)-OH

Fmoc-D-Tyr(All)-OH is an Fmoc-protected D-tyrosine derivative bearing an allyl-protected phenolic side chain, providing a chiral amino acid building block with orthogonal protection for peptide synthesis and subsequent functional-group unveiling. The molecule contains a fluorenylmethoxycarbonyl (Fmoc) group on the amino functionality, a free carboxylic acid for coupling at the C-terminus, and a phenolic oxygen masked as an allyl ether that can be selectively removed under mild conditions compatible with peptide fragments. The D stereochemistry at the α-carbon supports stereochemically defined peptide analog construction and unnatural amino acid incorporation where mirror-image control is required for binding studies or protease selectivity profiling. The combination of an acid handle, protected amine, and removable side-chain ether enables predictable reactivity in solid-phase or solution-phase peptide assembly and supports downstream derivatization of the tyrosine hydroxyl.

1. Peptide Synthesis

Fmoc-D-Tyr(All)-OH is used as a protected amino acid building block for peptide coupling in research-grade peptide synthesis workflows. The Fmoc group enables standard N-protection strategy, while the free carboxylic acid participates in amide bond formation to install the D-tyrosine residue at a defined position. The allyl-protected phenolic side chain is compatible with peptide assembly conditions and can be deprotected after chain elongation to regenerate the tyrosine hydroxyl for hydrogen-bonding and phenolic reactivity. The resulting peptide products can be used to generate stereochemically defined analog libraries and to support mechanistic studies where D-amino acid incorporation alters conformation and proteolytic stability.

2. Peptidomimetics And SAR

Fmoc-D-Tyr(All)-OH serves in peptidomimetic and structure-activity relationship studies where tyrosine side-chain functionality and stereochemistry are tuned for molecular recognition. The protected phenolic oxygen allows controlled timing of hydroxyl exposure, supporting stepwise synthesis of analogs that require either masked phenol groups during scaffold assembly or immediate phenol availability for receptor-contact modeling. D-configuration at the α-carbon provides a stereochemical handle for probing chirality-dependent binding modes, while the Fmoc strategy supports rapid incorporation into longer peptide-like frameworks. Downstream deprotected tyrosine residues can be further modified to generate SAR-relevant derivatives such as O-functionalized analogs for mapping hydrogen-bonding contributions and aromatic/phenolic interactions.

3. Side-Chain Functionalization

Fmoc-D-Tyr(All)-OH is applied in side-chain functionalization chemistry to access tyrosine-derived intermediates with controlled phenolic reactivity. The allyl ether protection on the tyrosine hydroxyl permits orthogonal handling relative to the Fmoc carbamate, enabling sequential deprotection and functional-group installation without exposing the phenol during earlier coupling steps. The regenerated tyrosine hydroxyl can then participate in etherification, esterification, or ether-based conjugation strategies to introduce solubilizing groups, linkers, or reactive handles for subsequent scaffold elaboration. The ability to stage phenol unmasking makes this amino acid derivative suitable for manufacturing of defined intermediate sets used in fine chemical synthesis and peptide-analog production.

4. Chemical Biology Labeling

Fmoc-D-Tyr(All)-OH supports chemical biology and biomolecule modification workflows that require site-defined tyrosine functionality within peptide conjugates. The Fmoc-protected amine and carboxylic acid enable incorporation into labeled peptide probes, while the allyl-protected phenol helps maintain controlled chemoselectivity during conjugate assembly. Phenolic deprotection can be used to generate a tyrosine hydroxyl-bearing conjugate suitable for further derivatization into linkers or recognition elements that participate in molecular interactions. D-tyrosine stereochemistry can be leveraged to tune probe stability and interaction profiles in biochemical research contexts where stereochemical fidelity and functional-group timing are critical.

5. Pharmaceutical Intermediate Preparation

Fmoc-D-Tyr(All)-OH is suitable for pharmaceutical intermediate preparation where defined, stereochemically controlled amino acid derivatives are required for downstream active-ingredient or process-related synthesis. The Fmoc-protected amino group and free carboxylic acid align with common peptide-coupling and fragment assembly logic used to build protected intermediates for medicinal chemistry campaigns. The allyl-protected phenolic side chain provides a practical protection strategy that can be removed to yield a reactive tyrosine hydroxyl for later functionalization steps in synthetic routes. The resulting intermediates can feed into peptidic or peptidomimetic manufacturing sequences, supporting consistent stereochemical outcomes and reproducible functional-group presentation across batch synthesis.

6. Analytical Research Standards

Fmoc-D-Tyr(All)-OH is utilized in analytical research as a stereochemically defined reference material for mass spectrometry, chromatographic method development, and peptide fragment characterization. The combination of Fmoc and allyl-protected phenol provides characteristic fragmentation patterns and controlled deprotection behavior that can support identification of tyrosine-containing peptide segments. D-configuration contributes to unambiguous differentiation from L-tyrosine analogs in chiral or stereospecific analytical workflows. The compound's protected functional groups also enable preparation of defined calibration or internal standard derivatives that reflect the same protection/deprotection logic used in peptide synthesis and downstream sample processing.

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