N-(4-Methoxyphenylazoformyl)-Arg-OH · HCl is an arginine-derived amino acid derivative bearing a guanidinium-containing side chain and an azoformyl-linked N-substituent on the amino function, with the carboxylic acid present as a free acid and the overall material provided as a hydrochloride salt. The molecule contains a protonatable guanidinium group and an azoformyl chromophore/functional handle, while the N-substitution modifies the α-amino reactivity relative to unprotected arginine and the HCl counterion stabilizes the salt form. In synthesis and chemical biology workflows, it is used as a labeled or functionalized arginine building block for preparing peptide-related intermediates, studying structure-reactivity relationships involving the azoformyl motif, and enabling analytical detection based on its chromophoric azo functionality.
N-(4-Methoxyphenylazoformyl)-Arg-OH · HCl is an arginine-based amino acid derivative presented as a hydrochloride salt, featuring a protected guanidinium functionality and an azoformyl-type N-substitution on the α-amino nitrogen. The molecule preserves the stereochemically defined arginine backbone while converting the side-chain into a formylated/blocked state that modulates nucleophilicity and directs chemoselective transformations. The 4-methoxyphenylazoformyl motif introduces an aryl-linked azo group that can participate in controlled activation and downstream functional-group unveiling, while the HCl salt form improves handling of the basic arginine-derived site. The overall reactivity profile aligns with protected amino acid chemistry, enabling peptide coupling workflows and subsequent deprotection or functionalization steps that restore or transform the guanidinium-derived functionality.
1. Protected Arginine Peptide Coupling
N-(4-Methoxyphenylazoformyl)-Arg-OH · HCl is applied in peptide synthesis workflows where arginine side-chain protection is required to prevent undesired guanidinium reactivity during N-terminal and side-chain chemistry. The derivative's N-substitution and guanidinium blocking strategy support amide bond formation at the α-carboxylate/α-amino region while maintaining orthogonality toward common coupling reagents. The arylazoformyl protecting motif can be incorporated into protected amino acid building block preparation, followed by deprotection to regenerate an arginine-compatible functional handle for subsequent peptide chain assembly. Downstream peptide analogs, including protected arginine segments in longer sequences, can be constructed with controlled side-chain chemistry using this amino acid derivative as a chiral, stereodefined input.
2. Chemical Biology Labeling Reagents
N-(4-Methoxyphenylazoformyl)-Arg-OH · HCl supports chemical biology research requiring arginine-compatible functional groups for conjugation and biomolecular modification. The hydrochloride salt form and the protected guanidinium framework allow the compound to be handled under conditions where basic sites are stabilized, while the azoformyl aryl group provides a chemically addressable handle for activation-linked labeling strategies. The derivative can be used to generate arginine-containing probes, including peptide conjugates and arginine-rich motifs, where later unmasking can expose guanidinium for molecular recognition or binding studies. The resulting labeled biomolecules serve as tools for studying protein-ligand interactions, receptor recognition, and amino acid side-chain contributions to binding specificity.
3. Peptidomimetic Side-Chain Engineering
N-(4-Methoxyphenylazoformyl)-Arg-OH · HCl is suitable for peptidomimetic construction and side-chain engineering where arginine-like charge distribution and hydrogen-bonding patterns are targeted for scaffold design. The protected arginine framework preserves the stereochemical relationship between the α-carbon and the side-chain, enabling incorporation into constrained or modified peptide backbones during synthetic organic chemistry. The arylazoformyl protection strategy can be leveraged to tune side-chain reactivity during iterative assembly, then converted into an active guanidinium or related functionality for downstream derivatization. The compound thereby functions as a chiral amino acid intermediate for generating arginine-bearing peptidomimetics used in molecular design, structure-activity relationship studies, and binding-site mapping.
4. Process Chemistry Intermediate Preparation
N-(4-Methoxyphenylazoformyl)-Arg-OH · HCl can be employed as a process chemistry intermediate for manufacturing protected amino acid derivatives and peptide building blocks on scalable routes. The presence of a defined arginine stereocenter, a salt-stabilized basic site, and a chemically defined N-protecting group supports reproducible handling and stepwise transformation planning in fine chemical synthesis. The azoformyl aryl protecting group provides a strategy for temporally masking reactive guanidinium character, which can reduce side reactions during coupling or intermediate isolation steps. Downstream, this intermediate can feed into larger-scale production of protected arginine-containing fragments used in peptide manufacturing and specialty chemical production where controlled deprotection and consistent side-chain behavior are required.
5. Analytical Reference Standards
N-(4-Methoxyphenylazoformyl)-Arg-OH · HCl is applicable to analytical research requiring arginine-derivative reference materials for method development and impurity profiling. The compound's distinct azoformyl/4-methoxyphenyl signature and hydrochloride salt form enable chromatographic and spectrometric differentiation from unprotected arginine and other common guanidinium-protected amino acids. The protected guanidinium state and defined stereochemical backbone can be used to calibrate quantitation and to track conversion during protected amino acid synthesis, deprotection, or peptide coupling sequence monitoring. Analytical characterization of this derivative supports quality control workflows for peptide building block preparation and for downstream intermediate formation in applied peptide science.
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