H-D-Asp-OtBu

H-D-Asp-OtBu is a protected D-aspartic acid derivative in which the amino functionality is present as an N-acetyl (H-D-Asp) form and the carboxyl group is masked as a tert-butyl ester (OtBu). The molecule retains the side-chain carboxylic acid characteristic of aspartate, providing a second acid handle for selective coupling, orthogonal protection, or controlled deprotection logic. The stereochemical configuration at the α-carbon is fixed as D, enabling stereodefined incorporation into peptide sequences and aspartate-containing analogs. The tert-butyl ester is acid-labile while the side-chain carboxyl can be manipulated through standard protection or activation strategies, making the compound a practical chiral amino acid intermediate for peptide construction and downstream functionalization.

1. Protected Amino Acids

H-D-Asp-OtBu serves as a protected amino acid building block for protected amino acid synthesis and peptide coupling chemistry, where the N-acetylated amine and the tert-butyl ester provide orthogonal reactivity control. The α-carboxyl is present as an OtBu ester, which can be selectively removed under acid conditions to enable C-terminal modification, while the side-chain carboxylic acid remains available for further derivatization or selective protection. The D-configuration at the α-stereocenter supports stereochemically defined peptide bond formation and permits generation of D-aspartate-containing motifs used in stereochemical studies and peptide analog design. The resulting intermediate logic supports stepwise assembly of aspartate-rich sequences and preparation of downstream derivatives that require controlled exposure of carboxyl functionalities.

2. Peptide Synthesis

H-D-Asp-OtBu is suitable for peptide synthesis workflows that incorporate aspartate residues with defined stereochemistry, particularly when D-aspartate incorporation is required for conformational or stability investigations. The protected ester at the α-position supports amide bond formation after activation of the carboxyl equivalent, while the side-chain carboxyl group can be protected or activated to control chemoselectivity during coupling. The presence of an N-acetyl form helps maintain consistent amide formation behavior and can be aligned with standard peptide assembly strategies that rely on stepwise deprotection and selective functional group unveiling. Downstream peptide analogs prepared from this chiral aspartate intermediate can be used for structure-activity relationship studies, peptide library generation, and rational design of peptide backbones containing non-proteinogenic stereocenters.

3. Side-Chain Functionalization

H-D-Asp-OtBu enables side-chain functionalization strategies that exploit the aspartate β-carboxyl group for controlled conversion into activated esters, amides, or other carboxyl-derived functionalities after appropriate protection-state management. The tert-butyl ester provides an additional orthogonal handle, allowing selective deprotection to generate a C-terminal carboxyl while preserving the side-chain for targeted derivatization. D-aspartate stereochemistry can be retained through these transformations, supporting the preparation of stereodefined intermediates for peptidomimetics and carboxylate-bearing scaffolds. Functionalized products derived from this intermediate can feed into conjugation-ready building blocks, linker-containing peptide analogs, and carboxyl-reactive fragments used in applied chemical biology research.

4. Chemical Biology Probes

H-D-Asp-OtBu can be applied in chemical biology research to generate stereodefined aspartate-containing probes and peptide-based reagents that interact with protein recognition elements in a stereospecific manner. The dual carboxyl functionality, combined with an acid-labile OtBu ester, supports construction of probe formats where one carboxyl can be exposed for binding or labeling while the other is masked or converted to a conjugation handle. The fixed D-aspartate configuration supports studies that distinguish stereochemical preferences in binding pockets and can be used to prepare labeled or affinity-tagged peptide fragments for assay development. Downstream derivatives prepared from this intermediate can serve as molecular recognition tools for mapping substrate preferences, investigating ligand conformational effects, and supporting biochemical characterization workflows.

5. Process Chemistry Intermediate

H-D-Asp-OtBu is suitable for process chemistry intermediate preparation where protected amino acid derivatives with acid-labile ester groups are used to design scalable peptide-manufacturing routes. The tert-butyl ester provides a predictable deprotection strategy for converting the α-carboxyl into a free acid at a controlled stage, supporting manufacturing logic that separates coupling steps from final functional group exposure. The presence of a stable N-acetyl form and a stereodefined D-aspartate center supports reproducible handling as a chiral intermediate in fine chemical synthesis. Downstream use can include preparation of aspartate-containing building blocks for peptide manufacturing, synthesis of peptidomimetic scaffolds, and generation of standardized intermediates for analytical reference materials and process development studies in industrial settings.

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