H-Aib-OBzl · HCl

H-Aib-OBzl · HCl is a hydrochloride salt of the protected alanine derivative Aib (α-aminoisobutyric acid) bearing a benzyl ester at the carboxyl terminus. The molecule retains the stereogenic α-carbon characteristic of Aib, while the benzyloxymethyl/benzyl ester functionality provides a stable, removable C-terminal protection handle for peptide coupling workflows. Protonation as the HCl salt supports handling of the amino functionality as an ammonium chloride, which can influence solubility and compatibility with coupling bases and activation conditions. The combination of a hindered, α,α-disubstituted side-chain and a benzyl-protected carboxyl group makes the compound suitable as a chiral amino acid intermediate and as a peptide-building-block precursor for downstream deprotection and fragment assembly.

1. Peptide Synthesis

H-Aib-OBzl · HCl is applied in peptide synthesis as a C-terminally protected Aib building block where the benzyl ester can be retained during coupling and later removed to reveal a carboxylic acid for chain extension or final product derivatization. The α-aminoisobutyric acid backbone, including the stereogenic center, supports stereochemically defined incorporation into growing peptide chains and can be used to introduce helix-promoting residues in peptide analogs. The HCl salt form helps manage the amino group during preparative steps, enabling controlled conversion into activated coupling partners when paired with appropriate base and coupling reagents. Downstream, benzyl ester deprotection can furnish a functional carboxylate handle for iterative peptide construction and for preparing peptide termini suitable for further conjugation.

2. Peptidomimetics And Helix Design

H-Aib-OBzl · HCl is used in peptidomimetic and molecular design programs where Aib residues impart conformational bias due to their α,α-disubstituted structure and steric restriction of backbone torsion. The protected carboxyl group as a benzyl ester supports assembly of constrained peptide-like scaffolds while maintaining a protected functional group compatible with sequential synthetic steps. Stereochemical fidelity at the α-carbon enables reproducible incorporation of the desired configuration into SAR-focused libraries and structure-guided analog generation. Resulting derivatives can be carried forward to side-chain functionalization, terminus modification, and comparative binding studies that rely on well-defined peptide geometry.

3. Protected Amino Acid Chemistry

H-Aib-OBzl · HCl serves as a chiral, protected amino acid intermediate for protected amino acid synthesis, where the benzyl ester provides a robust C-terminal protecting-group strategy during manipulations of the amino functionality. The hydrochloride salt form provides a practical salt-state for handling and can be leveraged to tune reactivity during conversion to coupling-ready intermediates or to facilitate selective transformations that depend on amino protonation state. The hindered Aib structure can also be advantageous when targeting derivatives that require controlled reactivity at the α-amino and carboxyl functionalities while minimizing side reactions. Benzyl ester deprotection downstream yields a carboxylic acid suitable for activation, derivatization, or incorporation into higher molecular weight intermediates.

4. Chemical Biology Labeling

H-Aib-OBzl · HCl is suitable for chemical biology workflows that require incorporation of a defined Aib residue into labeled peptides or peptide fragments used as probes. The benzyl ester protection supports multi-step construction of peptide constructs that can later be deprotected to generate a carboxyl group for coupling to linkers, tags, or affinity handles. The stereogenic α-carbon enables consistent stereochemical placement of the Aib motif, which can be important for maintaining probe conformation and recognition in biochemical assay contexts. Downstream derivatization of the exposed acid after deprotection enables formation of amide, ester, or activated carboxyl intermediates used in biomolecule labeling and probe assembly.

5. Process Chemistry Intermediate

H-Aib-OBzl · HCl can be employed in process chemistry intermediate preparation for fine chemical synthesis routes that require a stable, isolable protected amino acid form with a clear deprotection endpoint. The benzyl ester protection strategy aligns with manufacturing-friendly protecting-group cycles where hydrogenolysis or related benzyl-removal approaches can regenerate the free carboxylic acid for subsequent transformations. The Aib scaffold's steric character can contribute to predictable behavior during peptide coupling sequences, supporting reproducible intermediate generation for scale-up. The hydrochloride salt state supports handling logistics and can be integrated into controlled workup and intermediate isolation strategies for peptide-building-block production.

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