H-Asn-OMe · HCl

H-Asn-OMe · HCl is the hydrochloride salt of an N-acetylated asparagine methyl ester, featuring an amide side chain (Asn side-chain carboxamide) and an esterified C-terminus (OMe) that together define a protected amino acid ester platform for peptide coupling and downstream functionalization. The N-acetyl group on the amino nitrogen modulates nucleophilicity and supports controlled reactivity during assembly steps, while the chiral center at the amino acid backbone provides stereochemical fidelity to Asn-derived peptide segments. As the HCl salt, the compound presents a protonated amine/ester-associated environment that can improve handling and can influence coupling conditions by modulating base sensitivity. The combination of an amide-bearing side chain and a methyl ester makes H-Asn-OMe · HCl a practical intermediate for protected amino acid synthesis, peptidomimetic construction, and conversion into higher-order peptide building blocks.

1. Peptide Synthesis

H-Asn-OMe · HCl supports peptide building block preparation in peptide synthesis workflows by providing an N-acetylated asparagine methyl ester with a defined stereocenter and an intact side-chain carboxamide for Asn incorporation. The C-terminal methyl ester can be activated for amide bond formation, enabling controlled peptide coupling strategies while the N-acetyl group helps manage chemoselectivity during assembly. Side-chain carboxamide functionality can participate in hydrogen-bonding patterns that are relevant for peptide secondary structure and recognition studies, including when assembling Asn-containing sequences. Conversion from the ester form to activated acyl equivalents or further protected derivatives can extend the compound's use across iterative peptide construction and library synthesis in synthetic organic chemistry.

2. Protected Amino Acids

H-Asn-OMe · HCl functions as a protected amino acid derivative for N-protection and C-terminal ester strategy planning in preparative peptide chemistry and fine chemical synthesis. The N-acetyl protection state and the methyl ester C-terminus together define a reactivity profile that can be tuned through standard protection/deprotection logic, including ester hydrolysis or transesterification to access carboxylic acid intermediates for subsequent coupling. The side-chain amide remains available for derivatization or for maintaining native-like hydrogen-bonding features in Asn-derived scaffolds. This structural arrangement makes the hydrochloride salt form useful as a chiral amino acid intermediate that can be carried through multistep synthesis while preserving stereochemical integrity.

3. Chemical Biology Probes

H-Asn-OMe · HCl can be applied to chemical biology research where Asn-containing motifs are used to generate peptide-based probes, affinity handles, or recognition elements. The side-chain carboxamide provides a stable polar functionality that can be retained during conjugation design, supporting molecular recognition through hydrogen-bonding interactions and solvent exposure control. The N-acetylated backbone and ester handle can be converted into amide-linked intermediates for attaching reporter groups, linkers, or capture moieties in biomolecule labeling schemes. Downstream transformations from the ester to carboxylate or activated derivatives can enable incorporation into larger probe constructs used for studying protein-ligand interactions, substrate preferences, or binding-site microenvironments.

4. Peptidomimetics And SAR

H-Asn-OMe · HCl serves as a starting amino acid ester for peptidomimetic and structure-activity relationship studies that require Asn-like polar contacts and stereodefined scaffolds. The preserved side-chain carboxamide can be used as a functional anchor while the C-terminal ester enables systematic derivatization into alternative acyl forms, allowing SAR-driven variation of termini and coupling patterns. N-acetylation provides a consistent backbone modification that can influence conformational preferences and amide stability in analog series. Iterative conversion into analog building blocks supports medicinal chemistry-style SAR workflows that rely on controlled stereochemistry and functional group placement derived from amino acid chemistry.

5. Pharmaceutical Intermediate Preparation

H-Asn-OMe · HCl is suitable for pharmaceutical intermediate preparation in industrial fine chemical synthesis where chiral amino acid derivatives are assembled into protected or activated forms for downstream manufacturing steps. The compound's amino ester framework and N-acetyl protection can be leveraged to design scalable routes that incorporate Asn residues into larger intermediates while maintaining functional group compatibility for subsequent transformations. The hydrochloride salt form can facilitate handling in process settings by providing a defined salt state that can influence solubility and base sensitivity during conversion to acids, activated esters, or coupling-ready derivatives. The resulting Asn-derived intermediates can then feed into peptide-like intermediate construction, peptidomimetic synthesis, or other industrial-scale chiral building block manufacturing operations.

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