H-DL-Asp(OMe)-OMe · HCl is a hydrochloride salt of a derivatized aspartic acid in which both the α-carboxyl and side-chain carboxyl functionalities are converted to methyl ester groups, giving an amino acid ester framework with an Asp-derived side chain. The molecule contains a free α-amino group (as the hydrochloride salt) and two methyl ester carbonyls, with the "DL" designation indicating a racemic mixture of stereochemical configurations at the α-carbon center. As an amino acid ester hydrochloride, it is commonly employed as a protected/derivatized building block for peptide and amide coupling chemistry and for preparing aspartate-containing analogues in solution-phase or solid-phase synthesis, as well as for analytical method development requiring esterified Asp standards or intermediates.
H-DL-Asp(OMe)-OMe · HCl is a hydrochloride salt of a methyl-esterified aspartic acid derivative in the DL (racemic) form, featuring an α-amino group converted to an N-hydrogen (N-unprotected) amide precursor state and a side-chain carboxyl protected as a dimethyl ester (Asp(OMe)-OMe). The molecule contains two ester carbonyls that can participate in acyl transfer chemistry and can be selectively transformed under ester-compatible conditions, while the salt form improves handling of the amino functionality during downstream coupling and derivatization. The presence of a chiral center at the α-position in the racemate supports stereochemically defined peptide analog construction when paired with stereoselective resolution or when incorporated as a racemic building block. Ester-rich functionality also makes the compound a practical intermediate for converting Asp-derived motifs into amides, acids, or activated acyl equivalents used in peptide synthesis and fine chemical manufacturing.
1. Protected Amino Acid Chemistry
H-DL-Asp(OMe)-OMe · HCl is applied in protected amino acid synthesis workflows where dimethyl ester masking of the aspartate side chain supports controlled conversion to amide and acid functionalities. The Asp(OMe)-OMe motif provides two ester groups that can be carried through peptide coupling steps as latent carboxyl equivalents, enabling subsequent ester hydrolysis or selective activation for side-chain functionalization. The hydrochloride salt form helps maintain the amino group in a reactive state for acylation chemistry and for preparing N-protected or activated derivatives on demand. Racemic (DL) stereochemistry can be leveraged for generating Asp-containing libraries or for intermediate preparation where stereochemical resolution occurs at a later manufacturing stage.
2. Peptide Synthesis
H-DL-Asp(OMe)-OMe · HCl is used in peptide building block preparation and peptide coupling chemistry targeting Asp-containing sequences and peptidomimetic scaffolds. The α-amino functionality and the esterified carboxyl groups enable conversion into coupling-ready species, including N-acyl derivatives and activated Asp acyl equivalents after appropriate ester-to-acid transformations. The side-chain dimethyl ester can be retained during early coupling operations to minimize side reactions, then converted into the free β-carboxyl for incorporation of Asp-specific recognition motifs. DL incorporation supports synthesis of racemic peptide analogs for structure-activity relationship studies, fragment screening, or method development in peptide synthesis where stereochemical uniformity is not required.
3. Peptidomimetics And SAR Studies
H-DL-Asp(OMe)-OMe · HCl is suitable for peptidomimetic construction and structure-activity relationship studies where an aspartate side-chain geometry is introduced as an ester-protected precursor. The molecule's ester carbonyls allow downstream derivatization into β-carboxamide, β-carboxylic acid, or β-activated electrophiles that can be used to generate constrained analogs and side-chain-modified variants. Racemic stereochemistry can be employed to produce mixed stereoisomer libraries for SAR mapping, while later stereochemical refinement remains feasible through resolution or stereoselective analog synthesis. The amino acid scaffold supports systematic exploration of spacing and functional group presentation typical of Asp-based binding motifs in medicinal chemistry.
4. Process Chemistry Intermediate
H-DL-Asp(OMe)-OMe · HCl serves as a process chemistry intermediate for industrial-scale preparation of aspartate-derived amides, acids, and activated acyl building blocks. The dimethyl ester functionality can be used as a controllable protecting-group strategy during manufacturing routes, allowing ester stability during handling and enabling conversion to free carboxylates when required for subsequent steps. The hydrochloride salt form supports reproducible material handling and can facilitate consistent formation of reactive intermediates for downstream acylation or coupling operations. DL availability can be advantageous for cost-effective intermediate supply when stereochemistry is resolved later or when racemic products are acceptable for downstream synthesis.
5. Chemical Biology Conjugation
H-DL-Asp(OMe)-OMe · HCl can be applied in chemical biology workflows that require aspartate-based linkers and conjugation handles derived from ester-to-acid or ester-to-amide transformations. The protected β-carboxyl functionality provides a latent reactive group that can be unmasked to generate carboxylates for coupling to amines, hydrazides, or other nucleophiles used in labeling and biomolecule modification strategies. The amino functionality enables formation of N-acyl derivatives that can be integrated into linker architectures for attaching peptides, polymers, or small-molecule probes. Racemic input may be used for conjugation reagent development where stereochemical purity is not the primary determinant of labeling performance, while still maintaining a chemically defined aspartate-derived attachment motif.
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