N-α-Z-L-arginine benzyl ester tosylate is a protected L-arginine derivative in which the α-amino group is carbobenzyloxy (Z, Cbz) protected and the α-carboxyl group is present as a benzyl ester, with the arginine side chain retaining its guanidinium functionality. The molecule therefore contains a Z-protected α-amide/urethane-type nitrogen, a benzyl ester carbonyl, and a positively charged guanidinium group (as indicated by the arginine scaffold), while the tosylate counterion is associated with the basic guanidinium to form the tosylate salt. In synthesis and chemical biology workflows, it is used as a stepwise amino acid building block for preparing arginine-containing peptides or peptide-related intermediates, where the orthogonal protection and ester functionality support controlled coupling and downstream deprotection/functional transformations.
CAT No: CP00230
N-α-Z-L-arginine benzyl ester tosylate is a protected L-arginine derivative in which the α-amino group is carbobenzyloxy (Z) protected and the carboxyl group is present as a benzyl ester, while the guanidinium functionality is converted into a tosylate salt form to control ionic character and coupling behavior. The molecule retains the stereogenic α-carbon of L-arginine, providing predictable stereochemical outcomes in peptide coupling and downstream transformations. The Z group and benzyl ester enable orthogonal protection/deprotection strategies, whereas the tosylate-associated guanidinium can participate in ionic interactions and can be unmasked under suitable conditions to regenerate the free guanidine for bioconjugation or peptide assembly. This combination of protected amino acid architecture and controlled side-chain functionality makes the compound a chiral amino acid intermediate and peptide building block precursor for synthetic and process-oriented workflows.
1. Peptide Synthesis
N-α-Z-L-arginine benzyl ester tosylate supports peptide coupling chemistry in protected amino acid synthesis by combining an N-Z protected α-amine with a benzyl ester that can be converted into a reactive carboxyl equivalent during peptide assembly. The L-configuration at the α-carbon aligns with standard stereospecific amide bond formation, while the tosylate-associated guanidinium helps manage strong basicity during activation and coupling steps. Deprotection of the Z group and ester group can be sequenced to enable stepwise incorporation of arginine residues into protected peptide chains. The resulting arginine-containing intermediates can be used to construct peptide segments for biochemical research, peptidomimetic scaffolds, and sequence-defined oligomers where side-chain guanidine chemistry is required downstream.
2. Side-Chain Functionalization
N-α-Z-L-arginine benzyl ester tosylate is suited to side-chain functionalization workflows that rely on controlled guanidinium availability and orthogonal protecting-group behavior. The tosylate form moderates the guanidine's handling during derivatization, enabling subsequent conversion to free guanidine for reactions such as salt formation, nucleophilic engagement in guanidine-reactive conjugation schemes, or further protection prior to peptide synthesis. The Z-protected α-amine and benzyl ester provide orthogonality that can be leveraged to selectively modify the guanidine region without disturbing the backbone during intermediate preparation. Downstream, the functionalized arginine derivatives can serve as building blocks for chemical biology probes, receptor-binding motif analogs, and synthetic intermediates that require a stable, stereochemically defined arginine side chain.
3. Bioconjugation Chemistry
N-α-Z-L-arginine benzyl ester tosylate can be applied in bioconjugation chemistry where arginine-like guanidinium groups are used for biomolecule recognition, linker design, and affinity-driven attachment strategies. The protected amino acid framework allows controlled release of reactive functionalities, since deprotection steps can regenerate the free guanidine and the α-amino/carboxyl equivalents needed for conjugation handle installation. The tosylate-associated guanidinium can influence solubility and ionic interactions, which may be beneficial when preparing conjugation intermediates that must remain stable during coupling and purification. Resulting arginine-bearing conjugation partners can be used to generate labeled peptides, affinity tags, or biomolecule modification reagents for analytical research and applied biochemical workflows.
4. Protected Amino Acid Intermediates
N-α-Z-L-arginine benzyl ester tosylate functions as a chiral protected amino acid intermediate for manufacturing-oriented fine chemical synthesis and process chemistry intermediate preparation. The orthogonal protecting-group set, consisting of Z on nitrogen and a benzyl ester on the carboxyl group alongside tosylate control of the guanidinium, supports route design that separates backbone activation from side-chain handling. The defined L-stereochemistry helps ensure consistent stereochemical integrity across multi-step conversion to activated derivatives, peptide coupling reagents, or downstream building blocks. The compound's structure enables scalable intermediate generation for peptide building block preparation, including preparation of arginine-containing fragments used in industrial peptide manufacturing and specialty chemical production.
5. Analytical Standards And Method Development
N-α-Z-L-arginine benzyl ester tosylate is suitable for analytical research and method development where protected arginine derivatives are required as reference materials for characterization of peptide synthesis and derivatization steps. The combination of Z-protected amine, benzyl ester, and tosylate-associated guanidinium yields a distinct set of chromatographic and mass spectrometric signatures that can support monitoring of deprotection completeness, ester conversion, and side-chain protection state. The stereochemically defined L-arginine backbone supports consistent behavior in analytical workflows that compare protected versus deprotected arginine-containing species. Downstream, the compound can be used to generate calibration references or to validate analytical methods used in peptide building block synthesis, impurity profiling, and process development for amino acid derivative manufacturing.
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