H-D-Asp(Me)-OMe*HCl

H-D-Asp(Me)-OMe*HCl is a protected amino acid ester derived from D-aspartic acid, featuring a stereogenic center at the α-carbon, a side-chain carboxyl group converted to a methyl ester, and an additional N-terminal acetyl (H-D-Asp(Me)-) motif consistent with an N-acylated amino acid form. The molecule is presented as a hydrochloride salt, which increases handling stability and promotes solubility in polar organic media used for synthetic peptide chemistry. The combination of an esterified side chain and an N-acylated amino group yields controlled reactivity, enabling selective activation for peptide coupling while limiting undesired side reactions. The chiral configuration of the D-aspartate backbone supports stereodefined incorporation into peptide fragments and downstream conversion to carboxylic acid functionality after ester hydrolysis or transesterification strategies.

1. Peptide Synthesis

H-D-Asp(Me)-OMe*HCl serves as a peptide-building amino acid ester for assembling aspartate-containing sequences in solid-phase or solution-phase workflows where D-stereochemistry is required. The N-acylated amino functionality and the protected side-chain methyl ester reduce competing reactions during coupling, while the α-amino acid ester form can be activated under standard peptide coupling conditions to form amide bonds. The D-configuration enables stereochemically defined incorporation into peptide analogs, including D-Asp motifs used to tune protease resistance and conformational preferences. Downstream deprotection and ester conversion to the free carboxyl group can support formation of salt bridges, metal coordination sites, or targeted side-chain functionalization in longer peptide constructs.

2. Side-Chain Functionalization

H-D-Asp(Me)-OMe*HCl is well suited for side-chain derivatization chemistry because the aspartate side chain is present as a methyl ester that can be selectively transformed to carboxylic acid or further activated derivatives. The preserved stereocenter and the ester handle enable controlled generation of electrophilic acyl species for subsequent amide formation, ester exchange, or formation of mixed anhydrides under appropriate conditions. The N-acylated character can be leveraged to maintain chemoselectivity when introducing side-chain modifications that mimic native aspartate charge or introduce constrained analogs. Resulting functionalized aspartate fragments can be used to build peptidomimetics, generate SAR-focused libraries, or prepare intermediates for carboxylate-directed conjugation strategies.

3. Chiral Building Block Development

H-D-Asp(Me)-OMe*HCl functions as a chiral amino acid intermediate for stereoselective synthesis programs that require D-aspartate stereochemical control. The D-configuration at the α-carbon provides a defined spatial arrangement of the amino acid backbone relative to the side-chain ester, supporting reproducible outcomes in stereochemically sensitive coupling and downstream transformations. The hydrochloride salt form can facilitate handling during intermediate preparation and can help maintain the amino functionality in a reactive state for controlled derivatization sequences. The compound's protected ester and N-acyl features make it compatible with chiral synthesis planning, including stepwise conversion to free acids and subsequent incorporation into larger chiral frameworks.

4. Peptidomimetics And SAR Studies

H-D-Asp(Me)-OMe*HCl can be applied to peptidomimetic construction and structure-activity relationship studies where aspartate-like side-chain geometry and charge presentation are key design elements. The methyl ester side chain and N-acylated amino group allow the compound to be incorporated into short peptide analogs or scaffold fragments prior to side-chain deprotection, enabling systematic evaluation of how D-aspartate stereochemistry affects binding-relevant conformations. The ability to convert the ester to a carboxylate after scaffold assembly supports generation of analogs with tunable ionization patterns, which is often required for receptor or enzyme interaction mapping. The resulting D-Asp-containing intermediates can be used to prepare focused libraries for SAR workflows and to generate chemically consistent standards for analytical comparison across analog series.

5. Pharmaceutical Intermediate Preparation

H-D-Asp(Me)-OMe*HCl is suitable as a manufacturing-oriented amino acid ester intermediate for producing protected aspartate fragments used in peptide-based or peptide-derived active ingredient synthesis. The compound's ester-protected side chain and N-acylated amino functionality support controlled reactivity during stepwise assembly, helping manage chemoselectivity in multi-step routes that include coupling, purification, and subsequent deprotection. The hydrochloride salt form can improve process handling and reproducibility of salt formation and dissolution behavior in polar reaction media. Downstream conversion of the methyl ester to the free carboxylic acid enables formation of drug-like carboxylate motifs, salt forms, or activated derivatives required for further synthetic elaboration in fine chemical production.

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