H-D-Ala-OtBu · HCl is a D-alanine derivative bearing an N-terminal hydrogen (free amino) and a tert-butyl ester (OtBu) at the carboxyl terminus, supplied as the hydrochloride salt. The molecule contains an amino group and a carboxyl-derived ester functionality, with the D stereochemistry specified in the name and the HCl component forming a salt that increases the stability and handling of the basic amine. In synthesis and labeling workflows, this protected/derivatized amino acid ester can serve as a precursor for stepwise peptide or amide bond formation after appropriate activation, while the ester and salt form support controlled chemoselectivity during intermediate preparation and downstream coupling.
H-D-Ala-OtBu · HCl is a hydrochloride salt of the tert-butyl ester of D-alanine, featuring a D-configured α-carbon that fixes stereochemistry for downstream stereoselective peptide and peptidomimetic construction. The molecule contains an amino functionality present as an HCl salt and an esterified carboxyl group (OtBu), which together support controlled coupling chemistry while enabling orthogonal deprotection strategies. The tert-butyl ester is acid-labile, allowing conversion to the corresponding carboxylic acid under conditions compatible with many protected-amino-acid workflows. The salt form improves handling of the amine and can facilitate reproducible incorporation of D-Ala into protected peptide fragments and synthetic intermediates used in biochemical research and process chemistry.
1. Protected Amino Acid Synthesis
H-D-Ala-OtBu · HCl is applied in protected amino acid synthesis workflows where D-alanine stereochemistry must be preserved through peptide-building steps. The amino group as the hydrochloride salt and the tert-butyl ester provide a practical protection pattern that can be carried forward into amide bond formation while limiting side reactions from the free carboxylate. Acid-triggered tert-butyl ester cleavage can generate a carboxylic acid handle for subsequent coupling to protected amino acids or peptide fragments. Downstream, the compound functions as a stereochemically defined chiral building block for preparing D-Ala-containing intermediates used in fine chemical synthesis and peptide analog manufacture.
2. Peptide Coupling Chemistry
H-D-Ala-OtBu · HCl is suitable for peptide coupling chemistry targeting D-alanine incorporation at defined positions within short peptides and peptidomimetics. The tert-butyl ester enables controlled activation and coupling strategies by maintaining the carboxyl group in a protected form until the synthetic sequence requires it. The D-configuration at the α-carbon supports stereochemical control in amide bond formation, which is particularly relevant for generating protease-resistant peptide motifs and for mapping stereochemical effects in structure-activity relationship studies. The hydrochloride salt form can be used to manage the amine reactivity during coupling sequence design, supporting reproducible assembly of D-Ala-containing peptide building blocks.
3. Peptidomimetics And SAR Studies
H-D-Ala-OtBu · HCl is used in peptidomimetic construction and SAR studies where stereodefined D-amino acid residues are incorporated to tune conformational preferences and metabolic stability proxies. The combination of a protected amine (as HCl) and an acid-labile OtBu ester supports stepwise conversion into either coupling-ready fragments or carboxyl-functional intermediates used for iterative scaffold elaboration. The stable D-alanine stereocenter allows systematic comparison of stereochemical variants in molecular design campaigns, including analog series built around α-amino acid substitutions. The resulting D-Ala-containing derivatives can serve as substrates for further functional group installation, enabling downstream generation of structure-defined analog libraries for biochemical research.
4. Protein Engineering Prototyping
H-D-Ala-OtBu · HCl can be employed in protein engineering prototyping where D-amino acid analogs are introduced into peptide segments to probe backbone recognition and processing behavior. The protected amino acid ester form supports incorporation into synthetic peptide constructs that later undergo deprotection and ligation steps to produce defined D-Ala-containing sequences. The stereochemical integrity of the D-center is relevant for assessing how stereochemistry influences peptide conformation and interaction with enzymes or binding partners in controlled experimental systems. The compound thereby serves as a chiral intermediate enabling generation of modified peptide fragments used in applied protein engineering workflows and biochemical characterization.
5. Pharmaceutical Intermediate Preparation
H-D-Ala-OtBu · HCl is relevant to pharmaceutical intermediate preparation and process chemistry for manufacturing routes that require stereochemically defined D-alanine derivatives. The tert-butyl ester and amine hydrochloride salt provide a robust protection/deprotection logic that can be integrated into multi-step syntheses without exposing reactive carboxylate or free amine functionality prematurely. Acid-labile ester removal supports conversion to carboxylic acid intermediates used for subsequent derivatization, including formation of amide linkages or further functional group transformations. The compound's chiral, protected amino acid identity makes it suitable for producing D-Ala-containing intermediates that feed into downstream synthetic steps for specialty chemical production and industrial fine chemical synthesis.
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