N-Me-Asp-OH

N-Me-Asp-OH is an N-methylated aspartic acid derivative featuring the canonical amino acid backbone with a side-chain carboxylic acid and a stereogenic center at the alpha carbon (Asp configuration). The molecule bears a free carboxylic acid at the side chain and a free carboxylic acid at the alpha position, while the amino functionality is rendered as an N-methyl amide (or amide-like nitrogen environment) that changes peptide coupling behavior relative to primary amino acids. The presence of two carboxyl groups enables salt formation, controlled pH-dependent solubility, and downstream activation for amide bond construction. The N-methyl substitution also modulates conformational preferences and can serve as a stable, chemically defined building block or intermediate for peptide and peptidomimetic synthesis.

1. Peptide Coupling Chemistry

N-Me-Asp-OH is applied in peptide synthesis planning as a chiral aspartate-derived building block where N-methylation influences coupling and incorporation into amide-linked chains. The side-chain carboxyl group and alpha-carboxyl group provide defined handles for selective activation strategies, enabling controlled formation of peptide bonds and side-chain functional amide linkages after appropriate conversion to reactive derivatives. N-methylation supports incorporation of an N-methyl motif that can be used to tune backbone hydrogen-bonding patterns in peptide analogs and to generate constrained conformations in peptidomimetic scaffolds. Downstream use commonly includes preparation of aspartyl-containing fragments for solid-phase or solution-phase assembly and for generating defined stereochemical reference materials in amino acid chemistry workflows.

2. Peptidomimetics And Conformational Control

N-Me-Asp-OH is utilized in peptidomimetic construction and molecular design where the N-methylated amide functionality can modulate local structure around the aspartate residue. The two carboxyl groups allow systematic conversion into protected or activated forms that support sequential derivatization, including side-chain carboxyl engagement for intramolecular interactions or for attachment to linkers. The stereogenic alpha carbon provides stereochemical fidelity for SAR studies that require consistent spatial presentation of the aspartate side chain. Resulting derivatives can be used to generate libraries of N-methylated aspartate analogs for structure-activity relationship investigations and for probing how N-methylation alters peptide-like recognition.

3. Chemical Biology Labeling

N-Me-Asp-OH serves in chemical biology research as an amino acid-based intermediate for constructing labeled molecules that retain the aspartate side-chain topology while introducing an N-methyl amide. The side-chain carboxylic acid can be activated for conjugation to amine-bearing biomolecules or for attachment to solid supports used in affinity probes, while the alpha-carboxyl group can be managed through protection/activation to control chemoselectivity. N-methylation can improve stability against certain enzymatic processing pathways that recognize primary amide or free amino motifs, supporting preparation of defined conjugates for biochemical assays. Downstream workflows may include generation of tagged aspartate-containing probes, linker-bearing fragments, and reference standards for monitoring conjugation chemistry.

4. Process Chemistry Intermediate

N-Me-Asp-OH is suitable for process chemistry intermediate preparation where amino acid derivative handling benefits from the predictable reactivity of carboxylic acids and the reduced nucleophilicity of an N-methylated nitrogen. The dual carboxyl functionalities enable conversion to activated intermediates such as acid chlorides, mixed anhydrides, or ester forms under controlled conditions, supporting scalable synthesis of aspartate-containing products. The chiral center provides a stereochemically defined input for downstream manufacturing routes that require consistent stereochemical outcomes across peptide building block preparation. Industrially relevant use can include preparation of fine chemical intermediates for peptide analog manufacturing, linker synthesis, and specialty chemical production requiring N-methylated amino acid motifs.

5. Analytical Standards And Method Development

N-Me-Asp-OH is applied in analytical research as a chemically defined N-methylated aspartic acid standard for method development and identity confirmation in amino acid and peptide analysis. The presence of two carboxyl groups and an N-methylated nitrogen produces characteristic ionization behavior that can support calibration and retention-time referencing in chromatographic workflows. Stereochemical integrity at the alpha carbon enables use in stereochemical profiling contexts where differentiation of aspartate stereoisomers or N-methylated analogs is required. Downstream utility includes preparation of internal standards, impurity reference materials, and characterization aids for monitoring protected amino acid synthesis, peptide coupling outcomes, and derivative formation during synthetic campaigns.

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