Fmoc-[15N]Phe-OH

Fmoc-[15N]Phe-OH is an Fmoc-protected, 15N-labeled phenylalanine building block in which the amino acid backbone retains the stereogenic center at the alpha carbon, providing a chiral, peptide-compatible precursor for isotopically tracked workflows. The molecule contains the Fmoc carbamate on the nitrogen and a free carboxylic acid, enabling standard peptide coupling at the C-terminus while preserving the labeled amide nitrogen for mass-shifted detection. The incorporated 15N isotope primarily affects spectrometric and NMR observables without changing the chemical reactivity pattern of the amino acid functional groups. The Fmoc/acid combination supports orthogonal protection logic common to protected amino acid synthesis and downstream peptide assembly, making it suitable as a quantitative biochemical research intermediate and analytical tracer.

1. Isotope-Labeled Peptide Synthesis

Fmoc-[15N]Phe-OH is applied in peptide synthesis for stable-isotope labeling strategies used in quantitative mass spectrometry and NMR-based studies. The Fmoc-protected amine and free carboxylic acid define an amino acid building block format compatible with stepwise peptide coupling, while the 15N label on the phenylalanine nitrogen enables unambiguous incorporation tracking after deprotection and amide bond formation. The stereochemical integrity of the alpha carbon supports faithful incorporation into peptide sequences that require native-like backbone geometry. Labeled peptides generated from this intermediate can be used as internal standards, calibration references, or mechanistic probes for peptide bond formation, fragmentation behavior, and site-specific labeling verification in biochemical research.

2. Proteomics Quantification Standards

Fmoc-[15N]Phe-OH is used in proteomics and analytical chemistry workflows where isotopically defined amino acid residues improve measurement specificity. The Fmoc-protected nitrogen and carboxylic acid functionality enable conversion into peptides that contain a defined 15N-containing amide, producing predictable mass differences for targeted detection. The phenyl side chain contributes to typical proteomic peptide behavior, supporting realistic chromatographic and fragmentation profiles for method development. Isotopically labeled peptide standards derived from this compound can serve for instrument tuning, retention-time mapping, and quantitative normalization in analytical research and method validation for peptide-centric assays.

3. Peptidomimetic And SAR Probes

Fmoc-[15N]Phe-OH is relevant to peptidomimetic construction and structure-activity relationship studies where residue-level labeling supports binding-site mapping and conformational analysis. The protected amino acid format facilitates incorporation into short peptide analogs or constrained scaffolds through amide coupling, while the 15N label provides a spectroscopic handle for monitoring local environments around the phenylalanine residue. The aromatic side chain participates in hydrophobic and π-interaction patterns common to many bioactive sequences, supporting realistic scaffold behavior during SAR investigations. The resulting labeled analogs can be employed as molecular design tools to correlate structural modifications with observed physicochemical or spectroscopic signatures without altering the core amino acid connectivity.

4. Solid-Phase Peptide Manufacturing

Fmoc-[15N]Phe-OH can be employed in industrial and process chemistry contexts that require reproducible, protected amino acid inputs for solid-phase peptide synthesis. The Fmoc carbamate is designed for base-mediated deprotection under standard peptide synthesis conditions, while the free carboxylic acid supports coupling chemistry to growing peptide chains. The chiral alpha center and phenyl side chain maintain predictable steric and electronic characteristics that align with established peptide manufacturing routes. Isotopic labeling at the phenylalanine nitrogen enables downstream production of traceable peptide intermediates for analytical reference materials and quality-control workflows in specialty chemical production and peptide-related fine chemical synthesis.

5. NMR And Mechanistic Labeling

Fmoc-[15N]Phe-OH is suitable for mechanistic labeling in chemical biology and biochemical research where nitrogen-15 observables are used to interrogate reaction pathways and molecular interactions. The 15N-bearing amide nitrogen, introduced via peptide coupling from the protected amino acid, can enhance sensitivity and simplify assignment in NMR experiments that track labeled backbone positions. The Fmoc protection strategy supports controlled incorporation into peptides so that the labeled nitrogen resides in the desired chemical environment after deprotection. Labeled peptide products derived from this intermediate can be applied to study peptide bond dynamics, conformational equilibria, and interaction-induced chemical shift changes, supporting rigorous structure-function analysis in peptide science and applied amino acid chemistry.

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