H-L-beta-HIle-OH*HCl

H-L-beta-HIle-OH*HCl is a hydrochloride salt of an L-configured β-amino acid featuring a branched isoleucine-derived side chain and a free carboxylic acid, with the β-amino stereocenter providing a distinct chiral handle for stereocontrolled synthesis. The salt form increases water compatibility and stabilizes the protonated amine during handling, while the carboxyl group remains available for amide bond formation after activation. The β-amino acid topology differs from α-amino acids in how it participates in peptide coupling, enabling access to β-peptide motifs and β-amino acid-containing analogs. The combination of a stereodefined amino functionality and an unprotected acid makes the compound suitable as a chiral amino acid intermediate for protected-amino-acid derivatives and downstream peptide building block preparation.

1. β-Peptide Synthesis

H-L-beta-HIle-OH*HCl supports β-peptide construction in research settings where β-amino acid linkages are used to probe backbone-dependent conformation and proteolytic stability. The β-amino group can be coupled to activated carboxylic acid derivatives, while the L stereochemistry helps maintain defined stereochemical outcomes in β-residue incorporation. Hydrochloride salt handling can be leveraged to maintain amine protonation during intermediate formation, followed by controlled conversion to coupling-ready protected forms. Resulting β-peptide scaffolds can be used in peptide science workflows that require stereochemically defined, noncanonical amino acid residues.

2. Protected Amino Acid Chemistry

H-L-beta-HIle-OH*HCl functions as a chiral starting material for preparing N-protected β-amino acid derivatives and C-terminal activation reagents used in peptide building block synthesis. The presence of a free carboxylic acid enables formation of activated esters or acid derivatives, while the β-amino functionality can be protected to support selective coupling chemistry. Salt formation with HCl can be managed during protection and deprotection planning to avoid side reactions that may arise from free base conditions. Downstream protected intermediates derived from this compound can serve as inputs for automated peptide synthesis strategies and for controlled assembly of β-amino acid-containing sequences.

3. Chemical Biology Probes

H-L-beta-HIle-OH*HCl is applicable in chemical biology research where β-amino acid residues are incorporated into molecular probes to modulate backbone recognition and improve stability against enzymatic degradation. The stereodefined β-amino acid framework can be used to generate analogs for binding studies, affinity tags, or substrate mimics that retain defined spatial arrangement of side-chain substituents. The carboxylic acid group enables conjugation strategies after conversion to coupling partners, supporting linkage to carriers, fluorophores, or solid supports. β-amino acid incorporation derived from this compound can therefore enable structure-conscious probe design and systematic evaluation of molecular recognition features.

4. Peptidomimetic And SAR Studies

H-L-beta-HIle-OH*HCl can be employed in peptidomimetic construction for structure-activity relationship studies where backbone geometry and stereochemistry influence binding or functional outcomes. The β-amino acid stereocenter and branched side chain provide a defined steric and stereoelectronic environment that can be preserved through peptide coupling and subsequent functional-group transformations. Carboxyl activation and amide formation compatibility supports iterative synthesis of analog series, including β-residue substitutions and chain-extension variants. Resulting peptidomimetics can be used as chemically defined SAR intermediates to correlate side-chain placement and β-backbone effects.

5. Process Chemistry Intermediate

H-L-beta-HIle-OH*HCl is suitable for process chemistry intermediate preparation in fine chemical and specialty manufacturing contexts requiring chiral, isolable amino acid building blocks. The hydrochloride salt form supports practical handling and can simplify isolation and storage of the β-amino acid prior to conversion into protected forms or activated derivatives. The free carboxylic acid enables downstream transformation into coupling reagents and manufacturing-friendly intermediates used for peptide building block production. This makes the compound a relevant chiral amino acid intermediate for scalable synthesis of β-amino acid derivatives used in industrial peptide and peptidomimetic supply chains.

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