Bz-L-Arg-NH2*HCl

Bz-L-Arg-NH2*HCl is a benzylcarbonyl (Bz) protected L-arginine amino acid derivative present as an amine hydrochloride salt, featuring the L-configuration at the α-carbon and a side chain guanidinium functionality that is strongly basic and protonatable. The molecule combines a protected α-amino group (as the Bz carbamate/amide-type N-protection motif) with a free carboxamide/amine terminus (as the amino hydrochloride), enabling controlled participation in peptide coupling while maintaining the guanidinium group in a cationic, H-bonding-rich state. Salt formation improves handling and can modulate solubility in polar media, while the guanidinium moiety can be selectively managed through acid/base conditions during peptide assembly and downstream transformations. The protected, stereochemically defined arginine framework functions as a chiral intermediate for protected amino acid synthesis and for constructing arginine-containing peptides and guanidinium-bearing analogs with predictable reactivity.

1. Peptide Synthesis

Bz-L-Arg-NH2*HCl serves as an arginine building block for peptide coupling workflows where the benzoyl-protected amino functionality supports chemoselective activation. The L-arginine stereocenter and guanidinium side chain enable incorporation of a strongly basic residue into peptide chains, while the hydrochloride salt form can influence protonation state and coupling conditions for amide bond formation. The Bz-protected nitrogen can be carried through peptide assembly and later removed under appropriate conditions to reveal the desired amino functionality for further elongation or terminus modification. Downstream, the resulting arginine-containing peptides and protected intermediates are applicable to library synthesis, peptide fragment generation, and stepwise construction of guanidinium-rich sequences.

2. Side-Chain Functionalization

Bz-L-Arg-NH2*HCl can be applied to side-chain derivatization strategies that exploit the guanidinium group's strong hydrogen-bonding and nucleophilic character under controlled activation. The cationic guanidinium functionality supports formation of salt-stabilized intermediates and can participate in guanidinium-to-derivative transformations that preserve the stereochemical identity of the α-carbon for structure-activity relationship studies. The Bz-protected amino group helps maintain chemoselectivity by reducing undesired reactions at the backbone nitrogen during functional group installation on the side chain. The resulting guanidinium-bearing analogs can be used as intermediates for peptidomimetics, charged ligand scaffolds, and amino acid derivative synthesis where arginine-like recognition motifs are required.

3. Protected Amino Acid Chemistry

Bz-L-Arg-NH2*HCl functions as a chiral, N-protected arginine intermediate for protected amino acid synthesis and for designing orthogonal protection schemes in peptide chemistry. The benzoyl protection on the amino terminus provides a handle for controlled deprotection and subsequent coupling, while the guanidinium group's protonation behavior can be managed to align with orthogonality between protecting groups. Hydrochloride salt formation supports reproducible handling of the basic side chain during intermediate preparation and can reduce variability associated with free-base guanidinium solvation. The compound can therefore be employed to prepare downstream protected arginine derivatives, peptide coupling-ready fragments, and stereochemically defined intermediates used in fine chemical and process chemistry routes.

4. Chemical Biology Probes

Bz-L-Arg-NH2*HCl is suitable for chemical biology research requiring guanidinium-rich, arginine-based motifs for molecular recognition and biomolecular interaction studies. The combination of a protected backbone nitrogen and a free guanidinium functionality supports incorporation into labeled or modified peptides where strong electrostatic and hydrogen-bonding interactions are central to binding behavior. The hydrochloride salt form can assist in maintaining a charged state that is relevant for probe design targeting nucleic acid or protein interfaces, while the defined L-configuration supports stereospecific structure-function comparisons. Downstream derivatives prepared from this intermediate can be used to generate molecular probes, peptide-based interaction tools, and functionalized arginine analogs for biochemical assay development.

5. Pharmaceutical Intermediate Preparation

Bz-L-Arg-NH2*HCl can be employed in pharmaceutical intermediate preparation where arginine-containing fragments and guanidinium-bearing building blocks are required for peptide-like or peptidomimetic chemistries. The protected amino functionality enables controlled conversion into coupling partners, and the stereochemically defined L-arginine framework supports consistent incorporation into larger synthetic sequences. The guanidinium group's strong basicity and salt-forming behavior can be leveraged to tune solubility and handling characteristics of intermediates during manufacturing-scale fine chemical synthesis. The compound's role as a chiral amino acid derivative supports downstream generation of protected peptide segments, process-compatible intermediates, and guanidinium-containing scaffolds used in applied synthetic development.

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