H-Aib-OtBu · HCl

H-Aib-OtBu · HCl is a hydrochloride salt of the tert-butyl ester of α-aminoisobutyric acid (Aib), where the Aib backbone provides a sterically constrained, non-proteinogenic amino acid motif and the side chain is a gem-dimethyl group that strongly influences conformational preferences. The molecule contains an N-terminal amino group that is present as a protonated species under hydrochloride conditions, along with an esterified carboxylate protected as the OtBu group, which modulates polarity and coupling behavior. The chiral center at the α-carbon is configured as the amino acid stereocenter typical of Aib derivatives, enabling stereochemically defined incorporation into peptide sequences and peptidomimetic scaffolds. The combination of an amino hydrochloride salt and a tert-butyl ester provides a protection/activation profile compatible with standard amino acid derivatization and acid-mediated deprotection strategies used in peptide chemistry and synthetic organic synthesis.

1. Peptide Synthesis

H-Aib-OtBu · HCl is commonly applied in peptide building workflows where α-aminoisobutyric acid is introduced to bias secondary structure toward helix-like conformations. The Aib backbone, bearing a gem-dimethyl side chain, participates in amide bond formation after conversion to an activated coupling partner, while the OtBu ester can be removed under acidic conditions to reveal the free carboxylate for subsequent transformations or to adjust terminal functionality. Hydrochloride salt formation stabilizes the amino group for handling and can support controlled protection-state management during stepwise assembly. Downstream, the resulting Aib-containing intermediates can be used to construct short peptides, cyclic peptidomimetics, and conformationally constrained analogs for structure-function studies in peptide science.

2. Protected Amino Acids

H-Aib-OtBu · HCl serves as an amino acid ester intermediate in protected amino acid synthesis, where the tert-butyl ester protects the carboxyl functionality during coupling and derivatization steps. The sterically hindered Aib side chain and the α-amino hydrochloride state enable predictable behavior in synthetic sequences that require temporary masking of polar groups while maintaining stereochemical integrity at the α-carbon. OtBu ester protection can be selectively removed to generate a carboxylic acid handle for further amidation, esterification, or conversion into other peptide-compatible derivatives. The compound's protection pattern therefore supports manufacturing-style route design for producing Aib-based fragments, including C-terminal modified peptide building blocks and intermediate precursors for fine chemical synthesis.

3. Peptidomimetics And SAR

H-Aib-OtBu · HCl is suitable for peptidomimetic construction and structure-activity relationship studies where conformational restriction is engineered through incorporation of Aib residues. The gem-dimethyl side chain and the α-aminoisobutyric acid backbone can be used to tune backbone torsion angles, providing a defined scaffold for generating analog series with controlled steric and electronic properties. The amino and carboxyl functionalities, managed through hydrochloride salt formation and OtBu ester protection, facilitate sequential functional group interconversions needed for library synthesis and scaffold diversification. Downstream derivatives prepared from this intermediate can feed into SAR-focused medicinal chemistry workflows that explore how Aib placement and terminal modifications influence binding-relevant conformations without relying on proteinogenic amino acid geometry.

4. Chemical Manufacturing Intermediates

H-Aib-OtBu · HCl can be employed as a process chemistry intermediate for producing Aib-containing peptide fragments at scale, where protection-state control is central to robust manufacturing. The OtBu ester and amino hydrochloride combination provides a practical handle for isolating and transferring the amino acid derivative between unit operations while minimizing premature side reactions of the carboxyl group. Deprotection and subsequent coupling steps can be integrated into a stepwise synthetic route to generate defined terminal functionalities, including carboxylic acid or activated carboxyl derivatives for downstream assembly. The stereodefined Aib unit supports consistent batch-to-batch structural outcomes for industrial fine chemical synthesis of peptide analogs and conformationally constrained building blocks.

5. Analytical Standards

H-Aib-OtBu · HCl is applicable in analytical research as a reference material for monitoring amino acid ester and protected amino acid transformations by chromatographic and spectrometric methods. The presence of the hydrochloride salt and the OtBu ester creates characteristic ionization and fragmentation patterns that can be used to verify protection-state changes, such as ester stability during coupling conditions or acid-triggered deprotection to the corresponding carboxylic acid. The defined Aib stereocenter and gem-dimethyl motif enable unambiguous identification of Aib-derived intermediates in complex reaction mixtures. Downstream, analytically confirmed intermediates derived from this compound can support method development for peptide synthesis quality control, including verification of terminal group identity and intermediate integrity during multistep production.

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