H-Arg(Me)-OH · flavianate

H-Arg(Me)-OH · flavianate is an arginine-derived amino acid salt in which the α-amino acid framework is presented as a free amino acid (H-Arg(Me)-OH) and paired with flavianic acid (flavianate) to form a well-defined ionic solid. The structure features a stereogenic α-carbon characteristic of L-arginine chemistry, a guanidinium-bearing side chain that can participate in strong ionic and hydrogen-bonding interactions, and a methylated arginine side-chain motif (Arg(Me)) that modulates basicity, solubility, and metal-ion coordination behavior. The carboxylic acid functionality supports peptide coupling chemistry after activation, while the guanidinium group can be managed through protecting-group strategies during peptide synthesis. The salt form with flavianate can influence crystallization, handling, and downstream conversion to other protected amino acid derivatives used in peptide building block preparation and chiral intermediate workflows.

1. Protected Amino Acid Synthesis

H-Arg(Me)-OH · flavianate supports protected amino acid synthesis routes where the carboxylic acid is converted to peptide-coupling-ready derivatives while the guanidinium functionality is selectively protected or temporarily masked. The guanidinium side chain, together with the methyl substitution, can be carried through controlled derivatization steps that tune reactivity toward coupling reagents and suppress side reactions such as guanidinium acylation or salt-driven aggregation. The flavianate counterion can be used as a practical salt form for isolation and consistent dosing before conversion into N-protected or side-chain-protected arginine analogs. Downstream, the resulting protected intermediates can be employed for sequential peptide assembly and for preparing arginine-containing fragments in synthetic organic chemistry.

2. Peptide Synthesis

H-Arg(Me)-OH · flavianate functions as an arginine-based peptide building block precursor for solid-phase or solution-phase peptide coupling workflows targeting guanidinium-rich sequences. The free α-carboxylic acid and α-amino group enable standard peptide bond formation after activation, while the side-chain guanidinium motif can be protected to maintain chemoselectivity during chain elongation. The methylated arginine side-chain can be incorporated to generate peptides with altered charge density and hydrogen-bonding patterns, supporting peptide analog construction and controlled conformational behavior. The salt-associated handling characteristics can facilitate preparation of coupling-ready amino acid derivatives, which then feed into protected amino acid chemistry and peptide science applications.

3. Chemical Biology Labeling

H-Arg(Me)-OH · flavianate can be applied in chemical biology workflows that require arginine-like side-chain chemistry for biomolecule labeling, affinity-tag design, or probe construction. The guanidinium group provides a strong cationic handle for electrostatic interactions with nucleic acids, glycans, and protein surfaces, while the methylated side-chain can modulate binding strength and orientation in molecular recognition contexts. The amino acid backbone enables conversion to activated esters, amide-forming derivatives, or protected intermediates suitable for conjugation chemistry to peptides, linkers, or carrier molecules. Flavianate salt formation can improve reproducibility of intermediate preparation, supporting downstream formation of labeled biomolecule constructs used in biochemical research and molecular interaction studies.

4. SAR Studies And Peptidomimetics

H-Arg(Me)-OH · flavianate supports structure-activity relationship studies and peptidomimetic design where arginine-like guanidinium chemistry is tuned by methyl substitution on the side chain. The stereodefined α-amino acid core enables incorporation into analog series with controlled stereochemistry, while the side-chain functionality can be leveraged to generate cationic pharmacophore mimics, constrained scaffolds, or charge-balanced variants. The carboxylic acid group provides a synthetic entry point for building fragment libraries that can be coupled into larger peptidomimetic architectures using standard peptide coupling strategies. Downstream derivatization of protected forms enables systematic exploration of how guanidinium charge presentation influences molecular recognition in SAR and fragment-based molecular design programs.

5. Process Chemistry Intermediate

H-Arg(Me)-OH · flavianate is suitable for process chemistry intermediate preparation where amino acid salt handling, crystallization behavior, and conversion to coupling-grade derivatives are key manufacturing considerations. The ionic pairing with flavianate can support isolation as a stable solid and can be advantageous for consistent feedstock preparation prior to conversion into protected amino acid derivatives. The presence of a free carboxylic acid and an amino functionality enables predictable transformation into activated intermediates for peptide coupling, while the guanidinium side chain can be managed via protection/deprotection logic aligned with industrial peptide manufacturing routes. The resulting intermediates can be used to manufacture arginine-containing peptide building blocks, chiral amino acid derivatives, and downstream fine chemicals requiring stereodefined guanidinium-rich structures.

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