N-α-Fmoc-L- asparagine N-carboxyanhydride is a protected amino acid N-carboxyanhydride derived from L-asparagine, bearing an N-α Fmoc (9H-fluoren-9-ylmethoxycarbonyl) group on the amino nitrogen and forming the reactive cyclic anhydride at the carboxylate position. The molecule contains the Fmoc-protected amide-forming nitrogen within the NCA ring system and a carbonyl-rich electrophilic framework that can undergo ring-opening polymerization-type chemistry to generate asparagine-containing peptide backbones while keeping the side-chain amide of asparagine available for subsequent functionalization or participation in hydrogen bonding. As an N-carboxyanhydride intermediate, it is used in peptide synthesis workflows such as controlled polymerization or stepwise assembly approaches where an activated amino acid building block is required for incorporation of the asparagine residue under conditions compatible with Fmoc handling.
CAT No: CP00320
N-α-Fmoc-L-asparagine N-carboxyanhydride is an activated asparagine-derived carboxyanhydride that functions as a reactive peptide-building-block precursor for rapid amide bond formation. The structure encodes the L-asparagine stereochemistry at the α-carbon and presents an Fmoc-protected amino group that can be removed under base to reveal the N-terminus for subsequent coupling or iterative growth. The carboxyanhydride functionality is predisposed to nucleophilic attack by primary amines, enabling formation of new peptide bonds with retention of the asparagine side-chain amide for further derivatization. The resulting reactivity profile makes the compound particularly relevant for controlled peptide synthesis strategies and for generating well-defined asparagine-containing sequences used in biochemical research and synthetic methodology development.
1. Fmoc Peptide Coupling
N-α-Fmoc-L-asparagine N-carboxyanhydride supports Fmoc-based peptide synthesis workflows by acting as an activated carboxyanhydride that can undergo nucleophilic opening to form peptide bonds with amine-containing partners. The Fmoc group provides orthogonal protection of the N-terminus, allowing deprotection to generate a reactive amine while keeping the asparagine side-chain amide intact during chain assembly. The carboxyanhydride activation enables efficient incorporation of an asparagine residue into growing peptide chains, including sequences where side-chain amide preservation is required for hydrogen-bonding and solubility control. Downstream, the asparagine-containing peptides produced from this intermediate can be carried into SAR studies, peptide analog libraries, and method-development efforts focused on controlled incorporation of polar residues.
2. Unnatural Asparagine Analog Synthesis
N-α-Fmoc-L-asparagine N-carboxyanhydride can be applied in the synthesis of asparagine-modified scaffolds and peptidomimetic building blocks where the side-chain amide serves as a functional handle. The L-asparagine backbone stereochemistry and the preserved side-chain CONH2 enable subsequent transformations such as selective derivatization, conversion to alternative side-chain functionalities, or use in conjugation strategies that rely on amide-directed reactivity. The Fmoc-protected nitrogen allows integration into multi-step synthetic sequences that require staged deprotection and coupling without premature side-chain modification. The resulting intermediates and peptide analogs can be used for chemical biology research, molecular design, and structure-activity relationship studies that probe how asparagine polarity and hydrogen-bonding patterns influence target binding.
3. Bioconjugation Linker Construction
N-α-Fmoc-L-asparagine N-carboxyanhydride is suitable for bioconjugation chemistry where defined peptide linkers containing asparagine residues are used to control spacing, polarity, and amide-rich microenvironments. The activated carboxyanhydride chemistry enables attachment to primary amines, supporting the construction of peptide-based conjugates that can later be functionalized through the exposed N-terminus after Fmoc removal. The asparagine side-chain amide can participate in hydrogen-bonding interactions and can serve as a precursor to further derivatization steps that tune solubility or conjugate stability. Downstream products include labeled peptides, affinity reagents, and conjugation-ready intermediates used in biochemical assays, protein engineering tool development, and analytical reference material preparation.
4. Process Chemistry Intermediate Preparation
N-α-Fmoc-L-asparagine N-carboxyanhydride is relevant to process chemistry and fine chemical synthesis as an activated amino acid intermediate designed for manufacturing routes that require predictable peptide-bond formation chemistry. The compound's carboxyanhydride activation provides a controlled reactivity mode for converting amine nucleophiles into amide linkages while maintaining the stereochemical integrity of the L-asparagine α-center. The Fmoc protecting group supports orthogonal protection logic, enabling stepwise deprotection and coupling strategies that can be aligned with scalable synthetic planning for peptide building block preparation. The intermediate nature of this reagent makes it applicable to specialty chemical production where consistent asparagine incorporation and downstream derivatization of peptide products are required for industrial research material generation and peptide manufacturing workflows.
5. Analytical Standards And Method Development
N-α-Fmoc-L-asparagine N-carboxyanhydride can be employed in analytical research for preparing asparagine-containing peptide standards and calibration materials used in peptide characterization workflows. The defined L-configuration and the Fmoc-protected N-terminus allow reproducible generation of peptide fragments that include the asparagine side-chain amide, which is often a key structural motif in mass spectrometric and chromatographic method development. The carboxyanhydride reactivity supports construction of short peptides or defined termini that can be used to validate coupling efficiency, deprotection behavior, and identity confirmation of asparagine-bearing sequences. Broader downstream relevance includes development of analytical reference peptides for quality control in peptide synthesis research and for supporting method transfer across peptide chemistry platforms.
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