H-D-Asp-OMe

H-D-Asp-OMe is the methyl ester of D-aspartic acid, featuring the D-configured α-amino acid backbone with a side-chain carboxylate functionality and an esterified C-terminus (Asp-OMe). The molecule bears a free amino group at the α-position (as indicated by H-D-), while the side-chain carboxylic acid provides a second acidic handle that can be selectively protected or activated for coupling chemistry. The presence of two carboxyl-containing functionalities, one as a methyl ester and one as a carboxylic acid, creates a reactivity profile suited to stepwise derivatization, including controlled conversion to amides, esters, or activated intermediates. Stereochemical integrity at the D-asymmetric center supports its use as a chiral amino acid building block and as a stereodefined intermediate for peptide and peptidomimetic synthesis.

1. Peptide Synthesis

H-D-Asp-OMe supports peptide building-block workflows where D-aspartate stereochemistry is required for backbone stereocontrol and resistance to proteolysis in peptide analogs. The α-amino group can be transformed into an N-protected derivative for amide bond formation, while the side-chain carboxylic acid enables selective coupling or orthogonal protection strategies prior to ester hydrolysis or further functionalization. The methyl ester at the C-terminus can be maintained during fragment assembly and then converted to the corresponding acid for final coupling, enabling C-terminal modification sequences. Downstream, H-D-Asp-OMe-derived intermediates can be incorporated into Asp-containing peptides and D-Asp enriched scaffolds used for structure-activity relationship studies and synthetic methodology development.

2. Protected Amino Acid Chemistry

H-D-Asp-OMe serves as a practical chiral precursor for preparing N-protected D-aspartate derivatives used in protected amino acid synthesis. The combination of a free α-amino group and a side-chain carboxylic acid allows targeted protection planning, such as orthogonal masking of the side-chain carboxylate relative to the esterified C-terminus. The methyl ester can function as a temporary C-terminal protecting group during sequential transformations, including conversion to activated species for peptide coupling. The resulting protected D-aspartate intermediates can feed into iterative solid-phase or solution-phase assembly routes where stereochemical fidelity and functional-group compatibility are required.

3. Peptidomimetics And SAR Studies

H-D-Asp-OMe is suitable for generating D-aspartate-containing peptidomimetics and analog libraries where stereodefined side-chain geometry and carboxyl functionality influence molecular recognition. The side-chain carboxylic acid provides a hydrogen-bonding and ionizable motif that can be retained, amidated, esterified, or transformed into bioisosteres to probe structure-activity relationship parameters. The methyl ester can be used as a handle for controlled C-terminal elaboration, including conversion to acids or amides that mimic peptide termini in receptor-binding studies. D-configured incorporation from H-D-Asp-OMe can be applied to SAR-focused chemical biology campaigns that require stereochemically consistent amino acid units for comparative scaffold design.

4. Bioconjugation Chemistry

H-D-Asp-OMe can be employed in bioconjugation-oriented synthetic routes that require amino acid-derived linkers bearing defined carboxyl functionality. The molecule's dual carboxyl-containing features enable conversion into activated ester or amide-forming intermediates, supporting attachment strategies to biomolecular scaffolds through carboxyl-to-amine coupling or carboxyl-to-linker formation. The D-stereocenter can be leveraged to tune chemical stability and minimize undesired enzymatic processing of conjugates built from amino acid linkers. Downstream, D-aspartate-derived conjugation intermediates can be used to construct functional biomolecule derivatives for analytical research and chemical biology workflows involving labeled or modified protein/peptide targets.

5. Process Chemistry Intermediate

H-D-Asp-OMe functions as a chiral amino acid ester intermediate relevant to process chemistry and fine chemical synthesis where controlled functional-group staging is required. The methyl ester at the C-terminus provides a protected form that can be carried through multi-step sequences, while the side-chain carboxylic acid enables further derivatization to acids, amides, or activated coupling partners depending on the manufacturing route. The stereodefined D-aspartate framework supports reproducible downstream transformations into protected amino acid derivatives and peptide-coupling-ready building blocks. Industrially, the compound can be applied as an intermediate for producing D-Asp-containing peptide fragments, peptidomimetic building blocks, and related amino acid derivatives used in specialty chemical production and applied research material manufacturing.

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