H-Lys(nicotinoyl)-OH · HCl

H-Lys(nicotinoyl)-OH · HCl is a lysine-derived amino acid salt in which the ε-amino side chain is acylated with a nicotinoyl group, while the α-amino and α-carboxyl functionalities are present in a protected/ion-paired form as the hydrochloride. The molecule therefore bears a stereogenic α-carbon consistent with L-lysine configuration and contains a basic side-chain nitrogen that has been converted from a free amine to an amide, reducing uncontrolled cationic behavior during coupling. The nicotinoyl moiety introduces a pyridine-containing aromatic heterocycle with distinct hydrogen-bonding and metal-coordination characteristics, enabling targeted derivatization and subsequent functional transformations. The HCl salt form supports handling and solubility control, and the remaining carboxylic acid enables conversion into peptide-ready activated esters or coupling partners for downstream amino acid chemistry.

1. Peptide Synthesis

H-Lys(nicotinoyl)-OH · HCl supports peptide building-block workflows where lysine side-chain functionality must be masked as an amide to control chemoselectivity during N-to-C coupling. The α-carboxylic acid provides the reactive handle for peptide coupling chemistry, while the ε-nicotinoyl amide prevents side-chain amine participation, reducing side reactions such as branching or over-acylation. The pyridine ring can be retained through protected amino acid synthesis to enable orthogonal deprotection logic or later side-chain elaboration after peptide assembly. The resulting lysine-containing peptide analogs can be used for structure-activity relationship studies and for preparing defined peptide libraries with controlled basicity and aromatic heterocycle content.

2. Side-Chain Functionalization

H-Lys(nicotinoyl)-OH · HCl is suitable for side-chain functionalization strategies that leverage the nicotinoyl-protected ε-amide as a stable intermediate for controlled downstream transformations. The pyridine nitrogen and aromatic ring enable coordination-based tagging or selective derivatization under conditions compatible with the α-carboxylic acid and the L-lysine stereocenter. The ε-amide linkage can be carried through multistep synthesis and then converted via amide chemistry into alternative side-chain motifs when a free lysine amine or a different acyl pattern is required. Downstream products include functionalized lysine derivatives used in chemical biology research intermediate preparation and in synthetic organic chemistry routes that require predictable chemoselectivity.

3. Bioconjugation Chemistry

H-Lys(nicotinoyl)-OH · HCl can be applied in bioconjugation workflows where a lysine-based scaffold with an aromatic heterocycle is needed for controlled labeling or affinity modulation. The hydrochloride salt form helps manage protonation state during conjugation planning, while the ε-nicotinoyl amide reduces nonspecific reactions associated with free lysine ε-amines. The pyridine-containing nicotinoyl group can function as a recognition element for coordination-driven attachment strategies or as a handle for further derivatization into conjugation-ready intermediates. The compound's amino acid backbone also enables incorporation into peptide or peptidomimetic conjugates that serve as defined reagents for biomolecule modification and analytical studies.

4. Chiral Amino Acid Intermediate

H-Lys(nicotinoyl)-OH · HCl serves as a chiral lysine-derived intermediate for stereochemically defined synthesis of amino acid derivatives and peptide coupling partners. The L-configuration at the α-carbon provides stereochemical fidelity for downstream peptide construction and for generating structure-defined analogs used in method development and stereochemical control studies. The combination of a carboxylic acid with a side-chain nicotinoyl amide supports stepwise protection-group strategies, where the ε-amide acts as a stable masking group while the α-carboxyl group can be activated for coupling. The salt form further supports reproducible handling in fine chemical synthesis and process chemistry intermediate preparation where consistent physical properties matter.

5. Pharmaceutical Intermediate Preparation

H-Lys(nicotinoyl)-OH · HCl is relevant to pharmaceutical intermediate preparation and process chemistry intermediate design where lysine-derived fragments with heteroaryl functionality are incorporated into larger molecules. The α-carboxylic acid can be converted into activated derivatives for amide bond formation, while the ε-nicotinoyl amide maintains chemoselectivity by suppressing free ε-amine reactivity during multistep assembly. The pyridine heterocycle can be carried into final intermediates to influence polarity, hydrogen-bonding patterns, and coordination behavior in medicinal chemistry scaffolds. The compound can therefore be used to construct defined peptidomimetic or amino acid-based intermediates that feed into downstream synthetic campaigns and manufacturing-oriented route development.

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