N-α-Z-L-lysine amide hydrochloride is a protected lysine-derived amino acid amide in which the α-amino group is carbobenzyloxy (Z) protected and the α-carboxyl functionality is converted to an amide, while the side chain retains the ε-amino group characteristic of lysine. The molecule bears an amide linkage at the carboxyl position and a free ε-amino group on the lysine side chain, with hydrochloride counterion associated to the basic nitrogen(s) and an L stereochemical designation indicated by the product name. As a stepwise peptide and amide synthesis intermediate, it provides a protected α-amino handle for controlled coupling chemistry while maintaining a functional ε-amino group for subsequent derivatization, labeling, or incorporation into larger peptide or amino-amide architectures.
N-α-Z-L-lysine amide hydrochloride is an L-lysine-derived amide in which the α-amino group is protected as a benzyloxycarbonyl (Z, Cbz) carbamate and the side-chain bears the characteristic ε-amine of lysine, present as a hydrochloride salt. The molecule therefore combines a stereodefined chiral α-center with two nitrogen-containing functional domains: the Z-protected α-nitrogen and a protonated ε-amine that can participate in salt-stabilized handling and subsequent derivatization. The terminal amide functionality and the carbamate protection pattern shape its reactivity profile toward peptide coupling chemistry, while the Z group supports chemoselective deprotection under hydrogenolysis-compatible conditions. As a protected amino acid amide and chiral intermediate, it functions as a controlled building block for constructing lysine-containing peptides, amide-linked motifs, and side-chain functionalized lysine analogs.
1. Peptide Synthesis
N-α-Z-L-lysine amide hydrochloride supports peptide building-block workflows where lysine side-chain chemistry must be controlled during coupling. The Z-protected α-amino group enables selective peptide bond formation using the amide/activated carboxyl equivalent strategy while the ε-amine hydrochloride state reduces undesired side reactions during chain assembly. The defined stereochemistry at the α-carbon aligns with standard peptide coupling stereochemical retention expectations for L-lysine incorporation. Downstream, the Z group can be removed to expose the α-amino functionality for subsequent elongation steps or to enable orthogonal functionalization of the lysine residue in peptide synthesis.
2. Side-Chain Functionalization
N-α-Z-L-lysine amide hydrochloride is well suited to side-chain functionalization programs that require chemoselective manipulation of the lysine ε-amine while maintaining an orthogonally protected α-nitrogen. The ε-amine hydrochloride form can be neutralized and then converted into urea, carbamate, sulfonamide, or acylated derivatives, enabling incorporation of solubility handles, affinity tags, or reactive groups for downstream conjugation. The Z-protected α-carbamate provides a stable nitrogen protection mode during side-chain derivatization, supporting stepwise synthesis of lysine analogs for peptidomimetics and chemical biology probes. Lysine-derived amide architecture also facilitates formation of amide-linked scaffolds that can be carried forward into multi-step synthetic sequences.
3. Bioconjugation Chemistry
N-α-Z-L-lysine amide hydrochloride can be applied in bioconjugation and biomolecule modification workflows where lysine residues serve as reactive anchors for targeted labeling chemistries. The presence of a protected α-amino group and a side-chain ε-amine enables controlled introduction of conjugation-ready functionalities after appropriate protection-state adjustments. The amide-containing backbone supports stable linkages in conjugate constructs, including peptide-based linkers and lysine-containing attachment motifs used in affinity probes and labeled reagents. The chiral lysine framework helps maintain defined spatial presentation of functional groups, which is relevant for reproducible conjugate synthesis and subsequent analytical characterization.
4. Protected Amino Acid Intermediate
N-α-Z-L-lysine amide hydrochloride functions as a chiral, protected amino acid intermediate for manufacturing-oriented preparation of lysine-containing fragments and protected derivatives. The Z (Cbz) carbamate protection pattern provides a robust orthogonal handle for stepwise synthesis, allowing selective deprotection to reveal an amino functionality without disturbing other amide-linked elements. The hydrochloride salt form of the ε-amine supports practical handling and can be leveraged in process chemistry to manage protonation state during coupling or derivatization steps. The compound's defined lysine stereochemistry and functional group set make it suitable for fine chemical synthesis of peptide coupling partners, amide-linked intermediates, and downstream building blocks used in industrial-scale peptide and specialty chemical production.
5. Analytical Standards And SAR Studies
N-α-Z-L-lysine amide hydrochloride is compatible with analytical research and structure-activity relationship studies that rely on well-defined lysine-containing reference materials. The protected α-amino carbamate and the controlled ε-amine functionality allow generation of defined derivatives that can serve as standards for method development in LC-MS, HPLC, or derivatization-based assays. The amide linkage and stereodefined L-lysine center support reproducible fragmentation patterns and retention behaviors when used as calibration or comparison compounds. Lysine-based protected intermediates can also be incorporated into SAR-focused synthesis of analog panels where orthogonal protection strategies enable systematic variation of side-chain functionality while maintaining a consistent backbone.
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