H-D-Asp(OBzl)-OH

H-D-Asp(OBzl)-OH is a protected D-aspartic acid derivative in which the side-chain carboxylic acid is esterified as a benzyl ester (OBzl) while the alpha-amino group is acetylated (H-D-Asp indicates the amino functionality is present as the free N-terminus in the specified stereochemical form, with the overall compound presented for coupling as an amino acid building block). The molecule contains an alpha-carboxylic acid (for C-terminal or activated ester formation), a benzyl-protected side-chain carboxylate (introducing a stable, hydrophobic protecting group during peptide assembly), and a chiral center at the alpha carbon that enforces D-stereochemistry for stereodefined peptide analogs. The benzyl ester can be removed under hydrogenolysis conditions, enabling post-coupling unveiling of the side-chain carboxyl for subsequent derivatization or native-like aspartate functionality. The combination of a free alpha-carboxyl group and a protected side-chain carboxyl supports standard peptide coupling workflows and downstream conversion to aspartate-containing fragments used in biochemical research and fine chemical synthesis.

1. Peptide Synthesis

H-D-Asp(OBzl)-OH is applied in peptide building block preparation where aspartate side-chain protection is required to prevent undesired branching or cross-linking during amide bond formation. The benzyl ester on the side-chain carboxyl provides chemoselective stability under common coupling conditions, while the alpha-carboxylic acid enables activation for N-terminal or internal residue incorporation. D-stereochemistry at the alpha carbon supports stereodefined incorporation into peptides and peptidomimetics, enabling control over backbone conformation and turn formation. Benzyl deprotection after assembly can regenerate the free aspartate side chain for charge presentation, salt formation, or further functional group transformation, aligning with peptide science and synthetic methodology needs.

2. Peptidomimetics And SAR

H-D-Asp(OBzl)-OH serves in peptidomimetic construction and structure-activity relationship studies where stereochemical inversion and side-chain carboxyl availability are key variables. The protected aspartate side-chain carboxyl group allows sequential synthetic design, including late-stage deprotection to introduce a defined acidic functionality for receptor or enzyme binding studies in vitro. D-aspartate incorporation can be used to probe how stereochemistry and side-chain positioning influence molecular recognition, while the benzyl ester provides a handle for controlled unveiling during analog synthesis. The resulting aspartate-containing fragments can be extended into libraries of analogs for SAR workflows and fragment-based optimization in medicinal chemistry research.

3. Chemical Biology Labeling

H-D-Asp(OBzl)-OH is utilized in chemical biology workflows that require controlled exposure of the aspartate side-chain carboxyl for subsequent conjugation chemistry. The benzyl-protected side-chain can remain masked during peptide assembly or linker installation, reducing side reactions associated with free carboxylates while maintaining compatibility with amide-forming steps. Deprotection can generate a carboxylate suitable for coupling to amine-bearing biomolecules, for esterification to create reactive intermediates, or for incorporation into affinity tags and probes. D-stereochemistry can be leveraged to tune probe stability and resistance to proteolysis when incorporated into peptide-based labeling reagents.

4. Protein Engineering Substrates

H-D-Asp(OBzl)-OH can be employed in protein engineering and enzyme studies where defined aspartate residues are incorporated into peptide substrates, binding peptides, or engineered recognition motifs. The molecule's amino acid architecture supports incorporation as an aspartate-containing unit while the OBzl group maintains side-chain protection during synthetic assembly of longer peptide segments. D-stereochemistry enables the design of substrates or inhibitors that may show altered enzyme processing patterns compared with L-analogues, supporting mechanistic investigation of stereospecificity. Benzyl ester removal provides access to the free side-chain carboxyl for generating substrate analogs that participate in enzyme recognition and catalytic-site interaction studies.

5. Process Chemistry Intermediate

H-D-Asp(OBzl)-OH is suitable as a chiral amino acid intermediate in process chemistry intermediate preparation for fine chemical and specialty chemical production. The benzyl ester protecting group offers a practical protection strategy that can tolerate routine peptide coupling conditions, while enabling predictable downstream deprotection to yield the corresponding free aspartate functionality. The presence of a functional alpha-carboxylic acid supports conversion into activated derivatives for controlled manufacturing steps, including incorporation into larger peptide or peptidomimetic frameworks. D-stereochemical integrity supports stereopure intermediate supply for scalable synthesis of aspartate-containing research materials and industrially manufactured peptide building blocks.

6. Pharmaceutical Manufacturing Building Blocks

H-D-Asp(OBzl)-OH is applied in pharmaceutical manufacturing contexts as an amino acid derivative for constructing aspartate-containing intermediates used in peptide-based active ingredient synthesis. The OBzl side-chain protection supports chemoselective assembly of multi-residue sequences by minimizing side reactions from the aspartate carboxyl during coupling and purification operations. The alpha-carboxyl functionality enables integration into standard peptide synthesis logic, supporting conversion into activated forms compatible with automated or batch coupling strategies. Post-assembly benzyl deprotection can provide a defined free aspartate side chain for further derivatization steps, enabling consistent downstream processing toward final peptide or peptide-like intermediates used in applied manufacturing workflows.

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