H-D-Arg(NO2)-OMe*HCl

H-D-Arg(NO2)-OMe*HCl is a D-configured arginine-derived amino acid methyl ester salt bearing a nitro-substituted guanidino side chain, with the free α-amino functionality presented as a hydrochloride-associated form and the carboxyl group masked as an O-methyl ester. The molecule features a stereogenic center at the α-carbon in the D-configuration, a guanidino-related side chain that is electronically activated by the nitro substituent, and an ester that can be selectively transformed into carboxylate or activated acid equivalents for peptide coupling. Salt formation with HCl improves handling of the basic side chain and supports controlled reactivity during protected amino acid synthesis and downstream derivatization. The nitro-guanidino motif and methyl ester together enable staged functional group manipulation, including conversion to peptide-ready carboxylic acid derivatives and side-chain chemistry compatible with nitro-to-amino transformations under appropriate conditions.

1. Peptide Synthesis

H-D-Arg(NO2)-OMe*HCl is applied in peptide building and coupling development where a D-arginine stereocenter and a nitro-activated guanidino surrogate can be carried through as a controlled side-chain handle. The α-amino group and esterified carboxyl functionality support standard peptide construction strategies after conversion to a peptide-reactive acid form, while the D-configuration enables incorporation of stereochemically defined arginine analogs into peptide sequences. The nitro-substituted guanidino side chain can be used as a functional group staging element to manage reactivity during coupling and later transformation to an arginine-like functionality. The resulting peptide intermediates can serve as substrates for further derivatization, peptide library synthesis, and structure-activity relationship studies involving stereochemical inversion or side-chain electronics.

2. Chiral Amino Acid Intermediate

H-D-Arg(NO2)-OMe*HCl serves as a chiral amino acid intermediate for asymmetric or stereocontrolled manufacturing routes that require D-arginine derivatives with a protected or masked guanidino functionality. The defined D-stereocenter at the α-carbon supports downstream conversion into carboxylate derivatives, activated esters, or protected acid forms used in fine chemical synthesis. The methyl ester group enables controlled handling and can be hydrolyzed or converted into coupling-ready intermediates, while the nitro substitution provides a chemically distinct side-chain that can be selectively manipulated relative to other functional groups. The hydrochloride salt form assists in reproducible processing of the basic amino component, supporting consistent intermediate preparation for peptide building block manufacturing and chiral scaffold generation.

3. Side-Chain Functionalization

H-D-Arg(NO2)-OMe*HCl is utilized in side-chain functionalization workflows where the nitro-guanidino motif acts as a tunable electrophilic/electronic feature for subsequent chemical modification. The guanidino-related side chain bearing the nitro substituent can be carried through as a handle that modulates nucleophilicity and basicity during derivatization, enabling controlled access to arginine-like or substituted guanidine-containing products after appropriate downstream transformations. The ester and α-amino groups allow orthogonal functional group interconversions, including conversion of the ester to an acid for amide formation or activation for conjugation chemistry. The resulting functionalized amino acid derivatives can be incorporated into peptidomimetics, enzyme-binding motifs, or chemical biology probes that require guanidine-rich recognition elements with stereochemical definition.

4. Chemical Biology Probes

H-D-Arg(NO2)-OMe*HCl is suitable for chemical biology research where D-arginine-containing constructs and nitro-activated guanidino chemistry can be used to probe molecular recognition and binding-site preferences. The D-configuration can help evaluate stereochemical effects on peptide-protein interactions, while the guanidino-rich side chain supports interactions with anionic residues and nucleic-acid-like targets in biomolecular systems. The methyl ester and α-amino functionality enable preparation of peptide fragments or conjugation-ready intermediates that can be further functionalized for labeling or affinity capture strategies. The nitro-bearing side chain can also serve as a staged precursor for generating guanidine analogs within biosynthetic or synthetic mimicry contexts, supporting downstream probe and reagent construction.

5. Pharmaceutical Intermediate Preparation

H-D-Arg(NO2)-OMe*HCl is relevant to pharmaceutical intermediate preparation where stereodefined, guanidine-containing amino acid derivatives are required for peptide-like active ingredients and process chemistry intermediates. The protected amino acid ester form supports manufacturing-friendly handling and can be converted into peptide coupling acids, activated derivatives, or protected carboxyl equivalents used in controlled synthesis sequences. The nitro-substituted guanidino motif provides a distinct functional group for staged transformation, enabling route design that separates coupling steps from final side-chain conversion. The hydrochloride salt association supports consistent processing of the basic intermediate, facilitating preparation of defined chiral building blocks for subsequent assembly into larger molecules used in applied drug discovery chemistry workflows.

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