Bz-DL-Arg-OH

Bz-DL-Arg-OH is a benzoyl-protected arginine derivative presented as a racemic (DL) amino acid, featuring a benzoyl (Bz) group on the α-amino functionality and a free carboxylic acid (OH) at the C-terminus. The side chain contains the guanidinium functionality characteristic of arginine, which can engage in strong ionic and hydrogen-bonding interactions and can participate in salt formation or subsequent functional transformations. The stereochemical composition as a DL mixture means the chiral center at the α-position is present as both enantiomers, which is relevant for experiments where relative reactivity or racemate handling is acceptable. The combination of a protected amine, a carboxylic acid handle, and a highly polar guanidinium group makes this compound a practical chiral amino acid intermediate for peptide coupling logic and for downstream derivatization strategies that preserve guanidinium chemistry.

1. Protected Amino Acid Chemistry

Bz-DL-Arg-OH is applied in protected amino acid synthesis and intermediate preparation where an N-benzoyl (Bz) group provides amino protection while retaining a free carboxylic acid for coupling chemistry. The guanidinium-bearing side chain enables controlled salt-state behavior and can be carried through peptide assembly or functional group conversion steps that require ionic compatibility. The racemic DL stereochemistry can be leveraged for method development, building-block screening, or preparative routes that tolerate enantiomeric mixtures before later resolution or stereoselective incorporation. Downstream, the compound can serve as a precursor for generating arginine-containing peptide building blocks, guanidinium-functional derivatives, and analytical standards that track protected arginine reactivity in synthetic sequences.

2. Peptide Synthesis

Bz-DL-Arg-OH is suitable for peptide coupling chemistry in solid-phase or solution-phase workflows where a protected α-amino group and a free carboxyl group enable formation of new amide bonds. The benzoyl-protected amine can be used as an N-protection strategy compatible with standard peptide coupling conditions, while the guanidinium side chain supports arginine-specific recognition and can influence solubility and aggregation behavior during synthesis. The presence of a free carboxylic acid allows direct activation and incorporation into peptide chains, supporting C-terminal extension or internal residue placement depending on the synthetic design. The resulting arginine-containing intermediates can be carried forward to peptide analog construction, including sequences used for biochemical assays, peptide mapping, or materials-oriented peptide scaffolds.

3. Chemical Biology Research

Bz-DL-Arg-OH is employed in chemical biology research as an arginine-functional building block for generating guanidinium-rich probes, enzyme substrate analogs, and binding-focused molecular tools. The guanidinium group provides a strong handle for electrostatic and hydrogen-bonding interactions that often govern recognition by protein surfaces, nucleic acid-binding domains, and cell-surface receptors. The N-benzoyl protection and C-terminal carboxyl functionality support staged derivatization, including conversion to activated esters or further functionalization while maintaining the guanidinium chemistry. Racemic incorporation can be used for comparative studies of binding or reactivity patterns when stereochemical specificity is not the primary variable, enabling downstream synthesis of labeled or conjugatable arginine-containing constructs.

4. Bioconjugation Chemistry

Bz-DL-Arg-OH is applicable to bioconjugation chemistry where the carboxylic acid and guanidinium side chain can be used to design conjugates that mimic arginine-mediated binding motifs. The benzoyl-protected amine can be transformed through deprotection or re-protection logic to match conjugation site requirements, while the guanidinium group can drive interaction with negatively charged biomolecular surfaces and can improve conjugate retention in binding assays. The DL racemate can be used for library-style preparation of arginine-containing conjugation reagents when stereochemical uniformity is not required for initial screening. Downstream utility includes preparation of arginine-based linkers, peptide conjugates, and biomolecule-modification intermediates that can be incorporated into larger constructs for biochemical characterization.

5. Process Chemistry Intermediate

Bz-DL-Arg-OH is relevant to process chemistry and fine chemical synthesis as a manufacturable amino acid intermediate that integrates a stable N-protection element with a reactive carboxylic acid for controlled downstream conversion. The benzoyl group provides a defined protection state for the α-amino functionality, while the guanidinium side chain can be managed through salt-state selection and compatibility with coupling and activation steps. Racemic availability supports practical scale-up scenarios where enantiomeric separation is deferred to later stages or where method development uses DL material to establish robustness before stereochemical refinement. The compound can feed industrial intermediate preparation for arginine-containing peptide building blocks, derivatized guanidinium reagents, and other amino acid derivative streams used in specialty chemical production and applied peptide manufacturing.

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