N-α-Fmoc-N-γ-xanthyl-L-asparagine is a protected amino acid derivative in which the α-amino group is capped with an Fmoc protecting group and the side-chain amide nitrogen is substituted with a xanthyl (xanthene-derived) protecting group, retaining the asparagine backbone with an α-carboxylic acid and an α-carbon stereocenter specified as L. The molecule contains the Fmoc carbamate and the xanthyl-protected side-chain amide functionality, which together mask both primary and side-chain nitrogen reactivity to control chemoselectivity during stepwise peptide assembly and to reduce side reactions from unprotected amines. In peptide chemistry and related synthetic workflows, it functions as a protected asparagine building block for solid-phase or solution-phase incorporation, and its dual protection pattern supports the preparation of asparagine-containing peptides and peptide analogues for structure-activity studies, labeling, and downstream derivatization of the protected side-chain after deprotection.
CAT No: CP00319
N-α-Fmoc-N-γ-xanthyl-L-asparagine is an Fmoc-protected L-asparagine derivative in which the α-amino group is masked with the 9-fluorenylmethoxycarbonyl (Fmoc) protecting group and the side-chain amide nitrogen is further substituted with a xanthyl group. The molecule therefore presents an Fmoc carbamate at the α-position for controlled peptide coupling and an N-functionalized γ-amide side chain that modulates hydrogen-bonding and nucleophilicity relative to unprotected asparagine. The stereogenic center at the α-carbon retains the L-configuration required for stereochemically consistent incorporation into peptide sequences, while the aromatic Fmoc group and the xanthyl substituent add distinct aromatic and heteroatom-containing functionality that can influence solubility and chromatographic behavior. The protected amine and protected side-chain amide are designed to withstand common peptide synthesis conditions, enabling downstream deprotection or functional transformation to generate asparagine-like motifs and controlled side-chain reactivity in synthetic and biochemical workflows.
1. Peptide Synthesis
N-α-Fmoc-N-γ-xanthyl-L-asparagine is used in peptide building workflows where Fmoc-based solid-phase peptide synthesis requires an α-amino protecting group that can be removed under standard base conditions without perturbing other functionalities. The Fmoc carbamate at the α-position supports reliable N-terminal activation and coupling, while the γ-xanthyl-protected side-chain amide helps maintain side-chain integrity during chain assembly and suppresses undesired side reactions from the asparagine side chain. The L stereochemistry at the α-carbon ensures stereospecific incorporation into peptide backbones, supporting sequence-defined peptide analog construction. The resulting protected asparagine residue can be carried through synthesis and then converted to an asparagine-like functionality after selective deprotection or side-chain manipulation, aligning with peptide chemistry and peptide library production needs.
2. Side-Chain Functionalization
N-α-Fmoc-N-γ-xanthyl-L-asparagine is well suited for side-chain functionalization strategies in which controlled manipulation of the asparagine side-chain nitrogen is required to tune polarity, hydrogen-bond patterns, and chemical reactivity. The xanthyl substitution on the γ-amide nitrogen provides a protected handle that can be retained during early synthetic steps and later transformed to regenerate or further derivatize the side-chain functionality. The combination of an Fmoc-protected α-amino group and a protected side-chain amide enables orthogonal protection logic, supporting stepwise construction of peptide conjugates or non-natural asparagine analogs. Downstream processing can yield modified asparagine residues, enabling structure-activity relationship studies that probe how side-chain amide availability affects molecular recognition in peptide-based scaffolds.
3. Chemical Biology Probes
N-α-Fmoc-N-γ-xanthyl-L-asparagine is applied in chemical biology and biomolecular interaction studies where asparagine-containing motifs are incorporated into labeled peptides or probe constructs. The protected amide side chain can be used to control conjugation timing, allowing the peptide to be assembled with minimal side reactions before introducing a functional group for detection, affinity capture, or biophysical interrogation. Fmoc chemistry supports reproducible peptide assembly, while the xanthyl-protected γ-amide can help preserve side-chain integrity during labeling steps that might otherwise compete with free amide nucleophilicity or hydrogen-bond-driven aggregation. The stereochemically consistent L-asparagine framework supports the generation of sequence-defined probes that can be employed to interrogate binding interfaces, substrate recognition, or epitope-like features in amino acid and peptide science.
4. Peptidomimetics And SAR Studies
N-α-Fmoc-N-γ-xanthyl-L-asparagine is suitable for peptidomimetic construction and SAR-oriented synthesis where protected asparagine surrogates are needed to explore how side-chain electronics and hydrogen-bonding capacity influence structure-function relationships. The Fmoc-protected α-amino group enables incorporation into peptide-like backbones, while the γ-xanthyl-protected amide modulates the side-chain's effective donor/acceptor profile during scaffold assembly. The aromatic Fmoc group and the xanthyl substituent introduce additional aromatic and heteroatom features that can be leveraged to control conformational preferences and intermolecular interactions in analog series. The resulting protected intermediate supports a workflow for generating libraries of asparagine-modified peptides or peptidomimetics, supporting iterative SAR studies in synthetic organic chemistry and biochemical research.
5. Pharmaceutical Intermediate Preparation
N-α-Fmoc-N-γ-xanthyl-L-asparagine is relevant to pharmaceutical intermediate preparation and fine chemical manufacturing contexts where protected amino acid derivatives serve as controlled inputs for peptide-derived active ingredients, process intermediates, or analytical reference materials. The Fmoc-protected α-amino functionality supports standardized peptide coupling chemistry in manufacturing-relevant synthesis routes, while the γ-xanthyl-protected amide helps manage side-chain reactivity and reduces the likelihood of premature derivatization during multistep processing. The L-asparagine stereochemistry supports stereochemically defined product formation, which is critical for downstream quality control and analytical characterization of peptide intermediates. The compound's protected-group architecture aligns with industrially scalable synthetic logic for producing sequence-defined intermediates that can be converted into final peptide or peptidomimetic targets through controlled deprotection and functional transformations.
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