N-α-Fmoc-N-δ-Z-L-ornithine is a protected amino acid derivative of L-ornithine in which the α-amino group is masked with an Fmoc carbamate and the δ-amino group on the side chain is masked with a Z (benzyloxycarbonyl) carbamate. The molecule retains the free carboxyl functional group and bears a protected, positively addressable side-chain amine that is rendered chemoselective by the orthogonal Fmoc and Z protecting groups. In peptide synthesis workflows, it functions as a stepwise building block that supports controlled introduction of an ornithine residue into peptide chains and can be used in solid-phase or solution-phase strategies where orthogonal deprotection and side-chain protection are required for sequence-defined assembly.
CAT No: CP08721
N-α-Fmoc-N-δ-Z-L-ornithine is an orthogonally protected, chiral amino acid derivative based on the L-ornithine backbone, featuring an Fmoc group on the α-amino function and a Z (benzyloxycarbonyl) group on the δ-amino side chain. The zwitterionic amino acid core is masked as carbamate-protected functionalities, while the remaining carbon skeleton presents a stereogenic center that governs coupling stereochemistry in peptide assembly. The orthogonal protecting groups enable sequential deprotection and selective functionalization: Fmoc removal under base conditions exposes the α-amino terminus for iterative peptide coupling, whereas Z deprotection can be triggered under hydrogenolysis-compatible conditions to reveal the side-chain amine. The protected primary amines and carboxylate-bearing amino acid framework make the compound suitable for controlled peptide building block preparation and downstream derivatization of the ornithine side chain into guanidinium-like motifs, branching linkers, or constrained scaffolds.
1. Peptide Synthesis
N-α-Fmoc-N-δ-Z-L-ornithine supports solid-phase peptide synthesis workflows where orthogonal amino protection is required for controlled incorporation of ornithine residues. The Fmoc carbamate on the α-amine enables base-mediated unmasking to generate a reactive N-terminus for peptide coupling, while the Z-protected δ-amine preserves the side-chain functionality during chain elongation. The presence of the chiral L-configuration helps maintain stereochemical fidelity at the residue level across coupling steps, and the protected side-chain amine can later be revealed for on-resin or solution-phase modifications. The resulting ornithine-containing peptide sequences can be used to build polycationic segments, cyclic or constrained analogs, and side-chain functionalized peptide libraries that rely on selective amine availability.
2. Side-Chain Functionalization
N-α-Fmoc-N-δ-Z-L-ornithine is well suited for side-chain derivatization strategies that transform the δ-amino functionality into chemically distinct handles after orthogonal deprotection. The Z-protected side-chain amine can be unveiled to enable subsequent formation of urea, amide, sulfonamide, or carbamate linkages, supporting construction of ornithine-based peptidomimetics and molecular scaffolds with tuned polarity and hydrogen-bonding patterns. The intact Fmoc group during early stages can be used to control whether modifications occur at the α-terminus versus the δ-position, supporting stepwise synthesis of complex analogs. Downstream products can include protected intermediates for guanidinium-mimicking motifs, attachment points for linkers, or reactive amine derivatives used in chemical biology and materials-oriented conjugation routes.
3. Bioconjugation Chemistry
N-α-Fmoc-N-δ-Z-L-ornithine can serve as a controlled precursor for bioconjugation workflows that require orthogonally protected amines for sequential coupling to biomolecular targets. The compound's protected primary amines allow staged introduction of conjugation handles: α-amino exposure enables peptide or linker assembly, while δ-amine unmasking provides a second functional site for attachment chemistry such as amide or carbamate formation. The ornithine side chain contributes a flexible cationic-like geometry upon conversion to free amine or further functionalized derivatives, which can influence solubility and binding interactions in conjugate design. The resulting ornithine-bearing linkers and amino acid derivatives can be applied to generate labeling reagents, affinity probes, and defined conjugate architectures used in biochemical research and analytical method development.
4. Process Chemistry Intermediate
N-α-Fmoc-N-δ-Z-L-ornithine is applicable as a manufacturable, protected amino acid intermediate for industrial fine chemical synthesis where orthogonal protection supports reproducible downstream transformations. The Fmoc and Z carbamate groups provide chemically stable masking of both α- and δ-amines during intermediate handling, while still enabling predictable deprotection logic for stepwise assembly of peptide building blocks and side-chain modified derivatives. The chiral L-ornithine framework supports stereochemically consistent production of ornithine-containing intermediates used in peptide manufacturing and process-scale synthesis of functional amino acid derivatives. The compound's defined functional group set makes it suitable for integration into controlled reaction sequences that generate protected ornithine residues, peptidomimetic precursors, and intermediate streams for specialty chemical production.
5. Molecular Design And SAR Studies
N-α-Fmoc-N-δ-Z-L-ornithine is useful in structure-activity relationship study pipelines that require systematic variation of ornithine side-chain chemistry while maintaining a consistent peptide backbone. The orthogonally protected α- and δ-amines enable synthesis of analog series where side-chain modifications can be introduced after peptide assembly, supporting controlled comparison of charge density, hydrogen-bonding capability, and linker length. The stereogenic L-center ensures that analogs differ primarily in functional group presentation rather than residue stereochemistry, improving interpretability of structure-dependent outcomes in molecular design efforts. The resulting ornithine-containing peptide analogs and peptidomimetic fragments can be prepared for screening-oriented chemical libraries and mechanistic biochemical investigations that depend on precise amino acid derivatization patterns.
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