N-α-Boc-N-ε-Fmoc-L-lysine N-carboxyanhydride is a protected lysine-derived amino acid N-carboxyanhydride (NCA) bearing both an N-α Boc carbamate and an N-ε Fmoc carbamate on the side-chain amino group, with the lysine backbone providing the cyclic anhydride functionality for polymerizable/peptide-forming chemistry. The molecule contains the NCA ring that can undergo nucleophilic ring opening to generate peptide bonds while the Boc and Fmoc groups control chemoselectivity by temporarily masking the α-amino and ε-amino functionalities, and the stereochemistry is specified as L for the lysine-derived center. It is used as a reagent for stepwise or controlled synthesis of lysine-containing peptide segments and for preparing protected lysine motifs in peptide chemistry workflows where orthogonal protection (Boc vs Fmoc) and NCA-mediated chain growth are relevant.
CAT No: CP01419
N-α-Boc-N-ε-Fmoc-L-lysine N-carboxyanhydride is a protected lysine-derived amino acid anhydride that encodes the L-lysine side chain while presenting orthogonally protected α- and ε-amino functionalities for controlled peptide chemistry. The molecule incorporates an N-carboxyanhydride (NCA) reactive carbonyl framework that can undergo nucleophilic ring opening to form peptide bonds, while the Boc and Fmoc groups provide orthogonal protection patterns for sequential deprotection and selective coupling. The stereochemical integrity of the L-lysine backbone supports stereodefined incorporation into growing peptide chains, and the protected ε-amino handle enables downstream side-chain functionalization after orthogonal removal. This NCA format also behaves as a process-relevant intermediate for generating protected peptide segments and peptidomimetic precursors under conditions compatible with standard amino acid coupling and polymerization workflows.
1. Peptide Synthesis
N-α-Boc-N-ε-Fmoc-L-lysine N-carboxyanhydride is used in peptide synthesis as an N-carboxyanhydride building block that participates in peptide bond formation through nucleophilic ring opening. The α-amino functionality is protected as Boc, and the ε-amino functionality is protected as Fmoc, enabling controlled synthesis of lysine-containing sequences where selective deprotection can be timed to match coupling steps. The NCA reactivity supports generation of protected peptide fragments that can be further elongated or converted into defined lysine-rich segments for structure-activity relationship studies. The resulting Boc/Fmoc-protected peptide products serve as practical intermediates for downstream analog construction and purification-compatible workflows in synthetic peptide chemistry.
2. Protected Amino Acid Chemistry
N-α-Boc-N-ε-Fmoc-L-lysine N-carboxyanhydride is applied in protected amino acid synthesis and orthogonal protecting-group strategy development for lysine derivatives. The presence of both Boc and Fmoc protecting groups on the α- and ε-amino sites provides a chemically addressable pattern for sequential deprotection, allowing selective exposure of one amine while the other remains masked during subsequent transformations. The NCA scaffold functions as a protected lysine equivalent that can be incorporated into peptide chains or used as a controlled precursor for generating defined amino acid derivatives. Downstream, the orthogonally protected lysine units can be converted into side-chain-modified analogs, enabling systematic exploration of how lysine positioning and functional group state affect molecular recognition.
3. Bioconjugation Chemistry
N-α-Boc-N-ε-Fmoc-L-lysine N-carboxyanhydride is suitable for bioconjugation chemistry workflows that require lysine-reactive handles while maintaining orthogonal protection during synthesis. The protected ε-amino group can be unveiled after selective deprotection to generate a primary amine for conjugation chemistries such as acylation, carbamate formation, or linker installation onto peptides and biomolecule-derived scaffolds. The NCA-derived peptide segments provide defined lysine density and stereodefined backbone incorporation, which can improve reproducibility when preparing conjugation-ready intermediates for chemical biology and biomolecule labeling. The resulting lysine-functionalized constructs can then be used to generate conjugates for analytical standards, affinity probes, or labeled peptide libraries used in applied research and specialty chemical production.
4. Peptidomimetics And SAR
N-α-Boc-N-ε-Fmoc-L-lysine N-carboxyanhydride is employed in peptidomimetic construction and SAR-oriented library synthesis where lysine side-chain chemistry is a key variable. The protected lysine side chain enables incorporation of a stable amine-bearing motif into peptide-like scaffolds, supporting later conversion into amide, urea, sulfonamide, or other nitrogen-containing functional groups that mimic binding interactions. The orthogonal Boc/Fmoc protection pattern helps maintain structural integrity during scaffold assembly, while controlled deprotection allows introduction of substituents at the ε-position without perturbing the α-terminal chemistry. The NCA-derived intermediates support rapid generation of structure-defined analogs for SAR studies and fragment-based molecular design, feeding downstream synthesis of functional inhibitors, binders, or receptor probes.
5. Pharmaceutical Manufacturing Intermediates
N-α-Boc-N-ε-Fmoc-L-lysine N-carboxyanhydride is relevant to pharmaceutical manufacturing and process chemistry as a protected amino acid NCA intermediate for producing defined peptide building blocks at scale. The NCA format can be integrated into manufacturing routes that generate protected peptide fragments with controlled lysine incorporation, while the Boc and Fmoc groups provide protection stability during intermediate handling and downstream coupling steps. The ability to maintain orthogonal amino protection supports streamlined deprotection and re-coupling strategies, which can be aligned with batch-to-batch consistency requirements in fine chemical synthesis. The resulting protected lysine-containing intermediates can be further processed into drug-like peptide candidates, peptide conjugates, or regulatory-appropriate analytical materials used during applied development and production planning.
6. Industrial Biocatalysis Substrates
N-α-Boc-N-ε-Fmoc-L-lysine N-carboxyanhydride can serve as a substrate precursor for industrial biocatalysis and enzyme studies that require defined protected peptide or amino acid derivatives. The lysine-derived structure, combined with orthogonal Boc/Fmoc protection, enables preparation of enzyme-compatible peptide substrates where the reactive amine functionality is masked until the desired stage of the workflow. The stereodefined L-lysine backbone supports consistent recognition by proteases, transferases, or engineered enzymes that act on peptide-like motifs, while the NCA-derived chain segments can be designed to present specific length and functional group patterns. Downstream utility includes generating enzyme assay materials, mechanistic probes, and process intermediates for specialty chemical production where controlled peptide chemistry interfaces with biocatalytic transformations.
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