N-α-Z-L-arginine-4-nitroanilide hydrochloride is a protected L-arginine derivative in which the α-amino group is carbobenzyloxy (Z) protected and the carboxyl functionality is converted to a 4-nitroanilide, forming an anilide linkage at the amino acid C-terminus. The arginine side chain contains a guanidinium group capable of strong cationic hydrogen bonding, while the molecule also bears a free hydrochloride counterion that forms an amino acid salt state and includes the 4-nitroanilide aromatic ring with a nitro substituent. In peptide chemistry and chemical biology workflows, this compound functions as a stepwise amino acid building block and chromogenic/aryl amide substrate for monitoring coupling or cleavage events via the 4-nitroaniline motif, and it can be used to generate more complex arginine-containing amide or peptide intermediates under controlled protecting-group conditions.
CAT No: CP00231
CAS No:59188-53-3
Synonyms/Alias:H-Arg(Mbs)-OH;AC1OLR8N;ZINC2560663;(2S)-2-amino-5-[[amino-[(4-methoxyphenyl)sulfonylamino]methylidene]amino]pentanoicAcid;59052-83-4
N-α-Z-L-arginine-4-nitroanilide hydrochloride is a protected arginine-derived amide in which the α-amino group is carbobenzyloxy (Z) protected and the side-chain contains the guanidinium functionality characteristic of L-arginine. The molecule couples the arginine backbone to 4-nitroanilide, introducing an electron-deficient nitroaryl chromophore that supports spectroscopic readout and derivatization-aware reactivity. Hydrochloride salt formation provides a defined cationic environment for the guanidinium group, which can influence solubility, ion-pairing behavior, and coupling conditions in peptide chemistry. The combination of a Z-protected stereochemically defined amino acid derivative and a chromogenic amide makes this compound a practical chiral intermediate and analytical substrate for studying arginine-dependent transformations.
1. Chromogenic Substrate Assays
N-α-Z-L-arginine-4-nitroanilide hydrochloride is used in biochemical and analytical research as a chromogenic arginine amide substrate, where the 4-nitroanilide moiety enables monitoring of cleavage or enzymatic processing by UV-Vis detection. The Z-protected α-amino group and the L-arginine stereocenter help maintain a defined structure during assay development, while the guanidinium group supports recognition by arginine-specific proteases or amidases. Hydrochloride salt formation can stabilize the cationic guanidinium state, which may be important for enzyme binding and reproducible signal generation. Downstream, the nitroaniline product and related derivatives can serve as reference materials for method validation and for mapping substrate specificity in enzyme studies.
2. Peptide Coupling Building Block
N-α-Z-L-arginine-4-nitroanilide hydrochloride is applicable to peptide synthesis workflows where arginine-containing amide linkages and side-chain guanidinium chemistry require controlled protection and coupling strategy. The Z group on the α-amino position provides a removable protecting handle for stepwise construction, while the arginine guanidinium functionality can be carried through as a salt form to support consistent reactivity during amide bond formation. The existing C-terminal nitroanilide amide can be used as a defined terminal unit in fragment assembly or as a model substrate for optimizing coupling conditions relevant to arginine-rich sequences. Resulting intermediates and peptide analogs can be generated for structure-activity relationship studies and for developing synthetic routes that manage guanidinium-containing residues.
3. Protected Arginine Derivatization
N-α-Z-L-arginine-4-nitroanilide hydrochloride is suitable for amino acid derivatization and protected amino acid chemistry, leveraging the Z-protected α-amino group and the stereochemically defined L-configuration. The guanidinium-bearing side chain enables downstream functional group transformations such as salt-state tuning, conjugation site definition, and controlled incorporation into larger molecular scaffolds. The nitroanilide amide provides an additional functional handle for analytical tracking, purification monitoring, or conversion into alternative C-terminal groups after deprotection or functional group interconversion. Broader use includes preparing chiral arginine-based intermediates for fine chemical synthesis and for constructing guanidinium-rich building blocks used in peptide science.
4. Enzyme Specificity And Inhibitor Screening
N-α-Z-L-L-arginine-4-nitroanilide hydrochloride supports chemical biology research focused on enzyme specificity profiling, where an arginine-recognizing substrate structure can be used to compare substrate preferences across protease families. The combination of the guanidinium side chain and the defined amide linkage to the nitroaryl chromophore enables mechanistic studies that correlate signal generation with substrate recognition events. Z protection and the hydrochloride salt state help preserve the intended stereochemical and ionic features during screening and method development. Downstream, the substrate-derived readout can be used to guide the design and synthesis of arginine-mimetic inhibitors, peptidomimetics, and SAR libraries that target guanidinium-dependent binding pockets.
5. Analytical Standards And Method Development
N-α-Z-L-arginine-4-nitroanilide hydrochloride functions as an analytical research intermediate and standard candidate for developing assays that quantify arginine-amide cleavage products or monitor reaction progress involving arginine-like motifs. The nitroanilide chromophore provides a direct spectroscopic reporter, while the Z-protected arginine backbone offers structural definition for calibration and for interpreting chromatographic or spectrometric behavior. Hydrochloride salt formation can improve reproducibility in analytical workflows by stabilizing the guanidinium ionic form across measurements. Generated analytical derivatives and calibration materials can be used for quality control of peptide coupling steps and for characterizing arginine-containing intermediates in process chemistry intermediate preparation.
6. Fine Chemical Synthesis Intermediates
N-α-Z-L-L-arginine-4-nitroanilide hydrochloride is relevant to industrial chemical manufacturing contexts that require chiral amino acid derivatives and protected guanidinium-containing intermediates for downstream synthesis. The Z-protected α-amino group and the pre-formed amide to a nitroaryl reporter can be leveraged to design scalable routes for producing arginine-containing fragments, peptide analog building blocks, or assay-compatible intermediates. The stereochemical integrity of the L-arginine component supports stereocontrolled downstream assembly, while the salt-form guanidinium functionality can be managed to meet solubility and handling requirements during synthesis. Downstream utility includes producing specialty chemical intermediates for peptide science, biochemical research reagents, and process chemistry programs that incorporate arginine-based structural motifs.
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