H-D-Asp(tBu)-OH*H2O

H-D-Asp(tBu)-OH*H2O is the hydrated form of an N-terminally protected D-aspartic acid derivative in which the side-chain carboxyl group is tert-butyl protected, yielding a carboxylic acid at the α-position and a tert-butyl ester-protected side chain. The D-configuration at the α-stereocenter provides stereochemical control for peptide assembly and for preparing diastereomerically defined analogs. The presence of a tert-butyl ester protecting group enables orthogonal deprotection strategies under acid conditions, while the amino acid backbone remains compatible with standard peptide coupling chemistries. The hydrate form can influence handling and solid-state behavior, making it suitable as a reproducible chiral amino acid intermediate for peptide building block preparation and downstream functionalization.

1. Peptide Synthesis

H-D-Asp(tBu)-OH*H2O is used in peptide synthesis workflows where D-aspartate stereochemistry and side-chain carboxyl protection are required for controlled coupling and subsequent deprotection. The protected side-chain carboxyl (tBu ester) reduces undesired side reactions during amide bond formation, while the α-carboxylic acid and N-terminal amino functionality support incorporation as a defined residue. Acid-labile tert-butyl protection can be removed after chain assembly to reveal the free side-chain carboxyl for salt formation, charge tuning, or further derivatization. The resulting D-aspartate-containing peptides can be applied to generate stereochemically defined peptide analogs for structure-function studies and synthetic method development in amino acid chemistry.

2. Peptidomimetics And SAR Studies

H-D-Asp(tBu)-OH*H2O serves as a chiral building block for peptidomimetic construction and structure-activity relationship studies that require stable incorporation of a D-aspartate motif with a protected acidic side chain. The D-configuration influences backbone stereoelectronics and can be leveraged to access diastereomerically defined analog series, while the tBu-protected side-chain carboxyl supports late-stage functional group unveiling. Side-chain deprotection yields a carboxylic acid handle that can participate in hydrogen-bonding and ionic interactions relevant to molecular recognition, enabling systematic SAR comparisons across analog libraries. The compound's protected amino acid form supports scalable intermediate preparation for fine chemical synthesis of peptide-like scaffolds and related medicinal chemistry inputs.

3. Chemical Biology Labeling

H-D-Asp(tBu)-OH*H2O can be applied in chemical biology research where controlled installation of an acidic, site-specific functional group is needed for conjugation strategies. The side-chain carboxyl revealed after tert-butyl deprotection provides a reactive functional handle for forming amide, ester, or other carboxyl-derived linkages under coupling conditions compatible with biomolecular workflows. The D-aspartate stereochemistry can be used to tune resistance to proteolysis in peptide conjugates, supporting the generation of defined labeling reagents or probe precursors. Downstream derivatives prepared from this amino acid intermediate can feed into biomolecule modification campaigns, including reagent synthesis for mapping binding interfaces and monitoring molecular interactions.

4. Pharmaceutical Intermediate Preparation

H-D-Asp(tBu)-OH*H2O is suitable for pharmaceutical intermediate preparation where protected amino acid chemistry supports reproducible manufacturing of stereochemically defined building blocks. The tert-butyl ester protection strategy helps manage chemoselectivity during multi-step synthesis by temporarily masking the side-chain carboxyl, reducing competing reactions and enabling selective transformations at the backbone level. D-aspartate stereochemistry supports the construction of non-native peptide segments and acidic motifs used in process-driven synthesis of peptide-based intermediates and analogs. The hydrate form can be leveraged as a consistent feedstock in industrial fine chemical synthesis routes that require stable chiral amino acid inputs for downstream coupling and deprotection steps.

5. Process Chemistry Intermediate

H-D-Asp(tBu)-OH*H2O is employed in process chemistry contexts to prepare chiral amino acid intermediates with orthogonal protection suitable for scalable peptide coupling sequences. The combination of an N-protected amino acid backbone and a tBu-protected side-chain carboxyl supports controlled chemoselectivity across sequential synthetic operations, including intermediate isolation and purification. Acid-labile deprotection of the tert-butyl ester can be integrated as a planned step to unlock the side-chain carboxyl for subsequent conjugation, salt formation, or further functional group transformations. The compound's defined stereochemistry and protecting-group behavior make it applicable to manufacturing route design for peptide building block preparation and industrial intermediate generation in amino acid derivative production.

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