N-α-Boc-N-δ-Fmoc-L-ornithine N-carboxyanhydride is a protected amino acid N-carboxyanhydride derived from L-ornithine, bearing both an N-α Boc (tert-butoxycarbonyl) group and an N-δ Fmoc (9H-fluoren-9-ylmethoxycarbonyl) group on the side-chain amino functionality. The N-carboxyanhydride ring activates the α-carboxylate for ring-opening polymerization or peptide-bond formation chemistry while the protected amines suppress competing nucleophilicity, and the molecule retains the ornithine side chain with its terminal amino group masked by the Fmoc protection. In synthetic peptide and polymer chemistry, this activated intermediate is employed as a building block to generate ornithine-containing peptide segments or related oligomers under conditions that promote controlled N-carboxyanhydride reactivity while the Boc and Fmoc groups maintain chemoselectivity during stepwise assembly and subsequent deprotection.
CAT No: CP08711
N-α-Boc-N-δ-Fmoc-L-ornithine N-carboxyanhydride is an amino acid N-carboxyanhydride (NCA) derived from L-ornithine bearing orthogonal protecting groups on the side-chain and α-amino functionality. The molecule incorporates a chiral L-ornithine backbone with an activated N-carboxyanhydride ring for controlled amide-bond formation, while the α-amino is protected as a Boc carbamate and the δ-amino side chain is protected as an Fmoc carbamate. The presence of both Boc and Fmoc groups provides a staged deprotection logic that can be matched to peptide coupling and orthogonal functionalization workflows. The NCA activation state supports incorporation into peptide chains under conditions compatible with protected amino acid chemistry, and the protected side-chain amine enables downstream derivatization after selective removal of protecting groups.
1. Peptide Synthesis
N-α-Boc-N-δ-Fmoc-L-ornithine N-carboxyanhydride is applied in peptide synthesis as an N-carboxyanhydride building block for rapid amide-bond construction. The activated NCA functionality participates in chain-growth or coupling-like incorporation, while the Boc and Fmoc carbamates maintain orthogonality between α- and side-chain amine reactivity. The protected δ-amine supports selective side-chain deprotection strategies to enable lysine/ornithine-mimetic peptide analogs and controlled branching of functional groups. The resulting ornithine-containing protected peptide segments can be used as intermediates for longer peptide assembly and for generating libraries of sequence-defined cationic or polyamine-like motifs. NCA-based incorporation also aligns with synthetic planning where orthogonally protected amino acids are needed for stepwise functional group unveiling.
2. Protected Amino Acids
N-α-Boc-N-δ-Fmoc-L-ornithine N-carboxyanhydride functions as a protected amino acid derivative for orthogonally protected intermediate preparation in peptide building block workflows. The Boc-protected α-amino and Fmoc-protected δ-amino create distinct deprotection handles that can be sequenced to expose either the α-terminus chemistry or the side-chain nucleophile as required for subsequent coupling or derivatization. The N-carboxyanhydride activation state enables transformation into peptide-grade amide linkages while preserving the stability of the carbamate-protected amines during synthetic steps. Side-chain amine exposure after Fmoc removal can be used for further functional group installation, including acylation, alkylation, or conjugation chemistries relevant to ornithine-rich scaffolds. This makes the compound suitable for controlled synthesis of protected ornithine units and downstream conversion into diversified amino acid derivatives.
3. Bioconjugation Chemistry
N-α-Boc-N-δ-Fmoc-L-ornithine N-carboxyanhydride is suitable for bioconjugation chemistry workflows that require protected polyamine-like handles for selective attachment. The δ-amino protected as an Fmoc carbamate can be unveiled under orthogonal conditions to generate a nucleophilic side-chain for coupling to activated esters, aldehydes, isothiocyanates, or other electrophiles used in biomolecule labeling strategies. The NCA-derived incorporation into peptide or linker fragments can provide defined spacing and charge distribution, which can influence conjugate stability and reactivity during downstream functionalization. The Boc protection on the α-amino can be managed to maintain chemoselectivity when preparing conjugation-ready intermediates. Ornithine-containing linkers prepared from this NCA can serve as modular components for constructing peptide-based probes, affinity reagents, and chemically defined biomolecule conjugates.
4. Drug Discovery SAR Studies
N-α-Boc-N-δ-Fmoc-L-ornithine N-carboxyanhydride supports drug discovery and structure-activity relationship studies through the preparation of ornithine-containing peptide analogs and peptidomimetic fragments. The chiral L-ornithine center and protected side-chain amine enable consistent stereochemical presentation of cationic or hydrogen-bonding functionalities that are commonly explored in SAR campaigns. The NCA format allows incorporation into defined peptide sequences or constrained oligomeric scaffolds, while Boc/Fmoc orthogonality supports systematic side-chain modifications after selective deprotection. The resulting analogs can be used to probe the impact of side-chain length, charge density, and functional group placement on molecular recognition. This chemistry also facilitates rapid generation of structure-defined intermediates for analytical profiling and comparative SAR synthesis.
5. Pharmaceutical Manufacturing
N-α-Boc-N-δ-Fmoc-L-ornithine N-carboxyanhydride can be applied in pharmaceutical manufacturing contexts as a process-oriented intermediate for producing protected ornithine-containing peptide intermediates. The NCA activation state is compatible with manufacturing-minded synthetic planning where protected amino acid building blocks are converted into amide linkages under controlled conditions, while Boc and Fmoc carbamates help manage chemoselectivity across multi-step routes. The orthogonal protecting groups support downstream deprotection and functional group installation steps that are often required to reach final API-related peptide structures or advanced intermediates. The compound's defined stereochemistry supports consistent incorporation of L-ornithine units in sequence-controlled manufacturing workflows. Use of NCA-derived protected building blocks can therefore integrate into fine chemical synthesis strategies for producing reproducible peptide-grade intermediates used in industrial peptide supply chains.
6. Fine Chemical Synthesis Intermediates
N-α-Boc-N-δ-Fmoc-L-ornithine N-carboxyanhydride is employed in fine chemical synthesis as a chiral, protected amino acid intermediate for constructing functionalized ornithine-derived scaffolds. The N-carboxyanhydride moiety enables formation of peptide-like amide bonds, while the Boc and Fmoc carbamates preserve the α- and δ-amines during intermediate formation and allow selective unveiling for subsequent transformations. The side-chain protected amine can be converted into a range of derivatives after deprotection, including acylated, alkylated, or conjugatable forms that support downstream synthesis of peptidomimetics and heteroatom-functionalized linkers. The resulting intermediates can be routed toward analytical standards, labeled fragments, or specialized polymer/biomaterial building blocks where defined cationic spacing is required. This aligns with broader amino acid chemistry workflows that rely on stereochemically defined, orthogonally protected chiral intermediates for scalable synthetic development.
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