H-L-beta-HLys-OH*2HCl

H-L-beta-HLys-OH*2HCl is a lysine-derived amino acid salt in which the side-chain bears an additional chiral center at the beta position relative to the canonical lysine framework, giving a stereodefined, diamino-rich structure. The molecule contains an alpha-amino group and a side-chain amino functionality that, in the 2HCl form, are present as hydrochloride salts, increasing water compatibility while maintaining defined protonation states for downstream derivatization. The free carboxylic acid enables standard peptide coupling chemistries and controlled conversion to activated esters or amide-forming intermediates. The stereochemical integrity of the beta-amino motif supports incorporation into peptide building blocks and chiral synthetic sequences where side-chain geometry influences conformational preferences and recognition.

1. Peptide Synthesis

H-L-beta-HLys-OH*2HCl is applied in peptide synthesis as a stereodefined lysine analog bearing a carboxylic acid suitable for amide bond formation at the alpha position. The salt-protected amine state provided by 2HCl can be managed through base treatment and orthogonal protection selection, enabling controlled Nε or Nβ functionalization prior to coupling. The beta-amino stereocenter can be retained during standard protected amino acid chemistry, supporting construction of peptides with altered backbone/side-chain stereochemistry for mechanistic studies and scaffold generation. The resulting peptide products can be used as substrates, inhibitors, or structural probes in peptide science and chemical biology workflows that require defined amino acid stereochemistry.

2. Amino Acid Derivatization

H-L-beta-HLys-OH*2HCl functions as a derivatizable amino acid intermediate for installing functional groups on the primary amines and for preparing downstream activated derivatives. The diamino pattern enables selective transformation into N-protected forms, including orthogonal protection strategies that separate alpha and side-chain reactivity for stepwise modification. The carboxylic acid can be converted to amino acid esters or mixed anhydrides to support C-terminal modification and subsequent incorporation into larger molecules. The stereodefined beta position makes the compound suitable for preparing chiral amino acid derivatives used in synthetic organic chemistry and in the generation of structure-defined libraries for SAR studies.

3. Chemical Biology Labeling

H-L-beta-HLys-OH*2HCl is utilized in chemical biology and biomolecule labeling contexts where lysine-like side-chain amines are required for conjugation chemistry. The protonatable amino groups in the dihydrochloride form facilitate reproducible handling and can be switched to reactive free-base states under controlled conditions before conjugation. Side-chain functionalization can be used to introduce linkers, affinity tags, or handles for subsequent coupling to probes, enabling preparation of labeled peptides or amino acid-containing conjugates for target engagement studies. Beta-stereochemistry can be incorporated to tune molecular recognition and to probe how stereochemical variation in amino acid side chains affects binding and processing by enzymes.

4. Protein Engineering

H-L-beta-HLys-OH*2HCl supports protein engineering and applied biochemistry workflows that rely on defined amino acid analogs for altering local structure and interaction patterns. The alpha-carboxyl group and amino functionality allow incorporation into peptide segments through peptide coupling strategies, enabling generation of protein fragments or engineered peptides with stereochemically constrained side chains. The presence of a lysine-like amine enables post-incorporation modifications such as crosslinking, charge modulation, or attachment of functional moieties to study structure-function relationships. The stereodefined beta-amino configuration can be leveraged to create chiral variants that test hypotheses about conformational effects and recognition determinants in protein-like systems.

5. Pharmaceutical Intermediate Preparation

H-L-beta-HLys-OH*2HCl is suitable for pharmaceutical intermediate preparation and fine chemical synthesis routes that require chiral, amino acid-derived building blocks. The compound's carboxylic acid and amine functionalities enable conversion into protected amino acid derivatives, including N- and C-terminal protected forms used for stepwise assembly of peptide-like intermediates. The dihydrochloride salt form can be advantageous for controlling amine protonation during manufacturing-oriented handling before conversion to activated coupling partners. The stereodefined beta-amino motif supports downstream synthesis of peptidomimetic scaffolds and chiral fragments that can be carried through iterative protection, coupling, and deprotection cycles in industrial chemical manufacturing.

6. Process Chemistry Intermediate

H-L-beta-HLys-OH*2HCl is employed as a process chemistry intermediate for producing protected amino acid derivatives and for preparing standardized inputs for peptide coupling operations. The salt form supports aqueous or mixed-solvent handling while maintaining defined functional group identity prior to orthogonal protection and activation steps. The stable amino acid framework can be transformed into activated derivatives such as esters or coupling-ready intermediates, enabling scalable synthesis of amino acid building blocks used in peptide manufacturing and specialty chemical production. The stereochemical fidelity of the beta center makes the compound appropriate for industrial sequences where chiral integrity must be preserved across multiple synthetic transformations.

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