Fmoc-Asn(Trt)-NCA is an N-carboxyanhydride (NCA) derived from the amino acid asparagine, incorporating an Fmoc-protected amino terminus and a Trt (trityl) protected side-chain amide asparagine building block. The molecule contains a reactive anhydride ring characteristic of NCAs, along with the Fmoc carbamate and Trt group that mask the amino and side-chain functionalities to control chemoselectivity during polymerization or peptide chain growth. It is used as a protected amino acid monomer for stepwise peptide synthesis approaches that employ NCAs, supporting the incorporation of asparagine residues into peptide or peptidomimetic structures while maintaining orthogonal protection for subsequent deprotection and functional transformations.
CAT No: CP00321
CAS No:129288-36-4
Synonyms/Alias:N-α-Fmoc-N-γ-trityl-L-asparagine N-carboxyanhydride1;
Fmoc-Asn(Trt)-NCA is an Fmoc-protected asparagine N-carboxyanhydride (NCA) bearing an asparagine side chain protected as Trt (trityl) amide. The molecule combines a chiral amino acid-derived scaffold with an activated NCA carbonyl that readily participates in controlled amide bond formation, while the Fmoc group provides orthogonal base-labile protection for peptide synthesis workflows. The Trt protecting group on the side-chain amide nitrogen modulates nucleophilicity during coupling and can be removed under standard acidolysis conditions without disturbing the Fmoc strategy. The overall reactivity profile reflects NCA electrophilicity for rapid peptide bond construction and protected functional-group stability for downstream derivatization and intermediate handling.
1. Peptide Synthesis
Fmoc-Asn(Trt)-NCA is used in peptide building block preparation for stepwise solid-phase peptide synthesis and related coupling schemes where NCA activation supports efficient formation of Asn-containing amide linkages. The Fmoc carbamate and the Trt-protected side-chain amide nitrogen provide orthogonal protection that helps prevent side reactions during chain assembly and preserves the asparagine functionality for later deprotection. The NCA electrophilic center enables incorporation of the protected asparagine residue with stereochemical fidelity at the α-carbon while maintaining compatibility with standard Fmoc deprotection cycles. Resulting Asn-containing protected peptides can then be carried forward to generate native or selectively modified sequences for biochemical research and peptide library production.
2. Protected Amino Acid Chemistry
Fmoc-Asn(Trt)-NCA functions as an activated protected amino acid derivative for protected amino acid synthesis and intermediate preparation in synthetic organic chemistry. The Fmoc group serves as a removable handle for controlled exposure of the α-amino terminus, whereas the Trt group stabilizes the side-chain amide during peptide coupling and prevents undesired cross-linking or side-chain participation. The NCA form can be employed to access Asn-residue-containing intermediates under conditions tailored to avoid premature hydrolysis, supporting downstream conversion into protected peptide fragments or peptidomimetic precursors. The protected amino acid architecture also facilitates orthogonal deprotection planning for generating specific functional states for subsequent transformations.
3. Peptidomimetics And SAR
Fmoc-Asn(Trt)-NCA supports peptidomimetic construction and structure-activity relationship studies by enabling controlled installation of an asparagine residue within bioactive peptide-like scaffolds. The asparagine side-chain amide provides a hydrogen-bonding motif that can be retained through assembly and later deprotected to match the intended binding pharmacophore geometry. The protected NCA format allows consistent residue incorporation during analog synthesis, supporting systematic variation of neighboring residues while keeping the Asn side-chain protected until the final stages. Downstream, deprotected Asn-containing analogs can be used to generate SAR panels and to prepare defined fragments for molecular recognition studies and medicinal chemistry optimization.
4. Chemical Biology Labeling
Fmoc-Asn(Trt)-NCA can be applied in chemical biology research where Asn-containing peptide constructs are needed as substrates for labeling, probe generation, or affinity reagent development. The protected side-chain amide and orthogonal Fmoc strategy enable synthesis of defined peptide segments that can be deprotected to expose the native asparagine functionality for conjugation-compatible handling. The NCA-driven incorporation supports preparation of peptides with controlled sequence context, which is relevant when downstream labeling depends on precise positioning of hydrogen-bond donors and acceptors. Resulting labeled or conjugatable peptide reagents can then be used to interrogate biomolecular interactions, validate binding motifs, or support assay reagent preparation.
5. Pharmaceutical Manufacturing Intermediates
Fmoc-Asn(Trt)-NCA is relevant to pharmaceutical manufacturing workflows that require robust, scalable preparation of Asn-containing protected peptide intermediates for drug substance or process-related materials. The combination of Fmoc protection and Trt-stabilized side-chain amide aligns with common orthogonal protection strategies used to control deprotection order and minimize impurities arising from uncontrolled side-chain reactivity. The NCA format supports manufacturing-compatible peptide assembly routes where protected amino acid residues are incorporated with predictable functional-group outcomes. Downstream processing can convert these protected intermediates into correctly deprotected peptide sequences or defined fragments used in process development, analytical method qualification, and specialty intermediate production.
6. Process Chemistry And Fine Synthesis
Fmoc-Asn(Trt)-NCA serves as a chiral amino acid intermediate for process chemistry and fine chemical synthesis targeting Asn-containing building blocks. The activated NCA carbonyl enables amide bond formation under controlled conditions, while the Fmoc/Trt protection scheme provides a clear strategy for managing functional-group reactivity during multistep synthesis. The protected asparagine architecture can be integrated into longer synthetic sequences that require sequential protection, coupling, and deprotection to reach a defined product state. Downstream, the resulting Asn-containing protected peptides and fragments can be further transformed into peptidomimetic scaffolds, analytical standards, or specialized chemical manufacturing intermediates aligned with amino acid derivative production practices.
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