Fmoc-Abu(3-N3)-OH (2S,3S)

Fmoc-Abu(3-N3)-OH (2S,3S) is an Fmoc-protected, stereodefined amino acid derivative in which the side chain is a chiral azetidine-bearing motif functionalized with an azide group at the 3-position. The molecule contains an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group on the amino nitrogen, a free carboxylic acid for coupling, and a pendant azide that can participate in bioorthogonal ligation or serve as a masked handle for subsequent reduction, cycloaddition, or derivatization. The (2S,3S) stereochemistry fixes the relative configuration of the backbone and side-chain stereocenter, supporting stereocontrolled incorporation into peptides and peptidomimetics. The combination of an acid-bearing amino acid building block with an orthogonal azide functionality makes it suitable for protected amino acid synthesis, peptide coupling chemistry, and downstream functional group transformation.

1. Peptide Synthesis

Fmoc-Abu(3-N3)-OH (2S,3S) is used in peptide building block preparation for solid-phase peptide synthesis and related coupling workflows where an Fmoc-protected amine and a free carboxylic acid are required. The side-chain azide at the 3-position provides a latent reactive functionality that remains compatible with standard peptide chain assembly conditions while enabling post-coupling diversification. Stereodefined (2S,3S) configuration supports incorporation of the azetidine-like stereocenter into peptide backbones and constrained analogs, which can influence conformational preferences and protease recognition. The resulting azide-bearing peptide fragments can be carried forward to cycloaddition-based conjugation, reduction to amines, or further side-chain elaboration as part of peptide science and peptidomimetic construction.

2. Bioconjugation Chemistry

Fmoc-Abu(3-N3)-OH (2S,3S) supports chemical biology workflows that require azide functionality for orthogonal bioconjugation strategies. The pendant azide installed on the chiral side chain can be retained through peptide assembly and then used for selective ligation chemistry, enabling attachment of probes, affinity tags, or reporter groups to peptide-derived biomolecules. The Fmoc-protected amino acid format facilitates controlled incorporation into peptide scaffolds so that the azide is positioned at a defined residue and stereochemical context. Downstream conjugate generation from azide-bearing peptide constructs enables analytical labeling, biomolecule modification, and structure-controlled mapping of molecular interactions in biochemical research.

3. Peptidomimetics And SAR

Fmoc-Abu(3-N3)-OH (2S,3S) functions as a stereochemically defined residue for peptidomimetic construction in structure-activity relationship studies that probe the impact of constrained side-chain geometry. The azide-bearing side chain can act as a functional handle for generating a family of analogs through reduction to amines, conversion to heterocycles, or cycloaddition to introduce new substituents while maintaining the original (2S,3S) stereochemical arrangement. The Fmoc-protected amino acid derivative format is compatible with iterative synthesis of analog libraries where residue-level modifications are introduced at a specific position. The ability to vary the azide-derived substituent after incorporation helps generate structure-defined scaffolds suitable for SAR-driven optimization of binding and stability properties in applied molecular design.

4. Process Chemistry Intermediate

Fmoc-Abu(3-N3)-OH (2S,3S) serves as a chiral amino acid intermediate for fine chemical synthesis routes that require an Fmoc-protected nitrogen and a carboxylic acid for downstream transformations. The Fmoc group enables controlled N-protection during coupling and purification steps, while the azide side chain provides a chemically distinct functional group that can be carried through manufacturing steps and converted later under appropriate conditions. The fixed (2S,3S) stereochemistry supports reproducible stereochemical outcomes when the compound is used to prepare larger peptide fragments or functionalized chiral intermediates. The combination of protected amino acid handling and orthogonal azide reactivity makes it suitable for scalable intermediate preparation supporting peptide-manufacturing workflows and industrial synthesis of functional building blocks.

5. Analytical Research Standards

Fmoc-Abu(3-N3)-OH (2S,3S) can be used to prepare analytical reference materials and method-development standards for monitoring azide-containing peptide building blocks and their derivatives. The presence of an Fmoc-protected amine and a free acid enables formation of well-defined peptide-like conjugates or model compounds that reflect residue-level incorporation and subsequent azide transformations. The stereodefined (2S,3S) configuration supports analytical discrimination when stereochemical purity and residue identity are important for method validation. Azide-bearing derivatives derived from this compound can support LC-MS characterization, impurity profiling, and controlled comparisons during amino acid derivatization and peptide synthesis optimization in research and industrial quality-focused environments.

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