H-beta-(2-Quinolyl)-D-Ala-OH

H-beta-(2-Quinolyl)-D-Ala-OH is a chiral D-alanine derivative bearing a 2-quinolyl substituent at the β-position, yielding a stereodefined amino acid framework with an α-amino group and a free carboxylic acid. The aromatic 2-quinoline ring introduces a rigid, electron-rich heteroaromatic motif with a basic nitrogen that can influence solubility, coordination behavior, and noncovalent binding in molecular recognition studies. The β-substitution changes steric and electronic properties relative to unmodified alanine, which can affect peptide coupling reactivity and the conformational preferences of resulting amide linkages. As an amino acid building block, it functions as a chiral intermediate for peptide analog construction, heteroaryl side-chain incorporation, and downstream derivatization through standard amino acid protection and activation strategies.

1. Peptide Synthesis

H-beta-(2-Quinolyl)-D-Ala-OH is applied in peptide building block preparation where the α-amino and carboxylic acid groups enable controlled amide bond formation after appropriate protection and activation. The β-2-quinolyl side chain can be carried through peptide assembly to introduce a heteroaryl handle that participates in π-stacking and can modulate local conformational behavior along the peptide backbone. The D-configuration supports stereodefined unnatural amino acid incorporation, supporting synthesis of peptides with altered protease stability and distinct binding profiles in chemical biology workflows. Resulting quinolyl-containing peptide fragments can be further extended, cyclized, or used as scaffold components for structure-activity relationship studies and peptidomimetic design.

2. Chemical Biology Probes

H-beta-(2-Quinolyl)-D-Ala-OH is suitable for chemical biology research requiring heteroaromatic amino acid incorporation into labeled or affinity-tagged biomolecule fragments. The 2-quinoline nitrogen and fused aromatic system can serve as a recognition element for binding assays, imaging-adjacent probe development, or receptor/target engagement studies in vitro. The amino acid functionality supports conjugation strategies where the carboxyl group can be converted to activated esters or coupling handles, while the α-amino group can be protected during synthesis and later deprotected for site-specific attachment. Quinoline-bearing peptide analogs prepared from this chiral intermediate can then be used to interrogate molecular interactions and to generate structure-defined probes for biochemical investigations.

3. Chiral Amino Acid Intermediate

H-beta-(2-Quinolyl)-D-Ala-OH is utilized as a chiral amino acid intermediate for stereoselective synthesis of β-substituted alanine derivatives and related unnatural amino acid libraries. The stereogenic center at the alanine α-position, combined with the β-heteroaryl substitution, provides a defined three-dimensional arrangement that can be preserved through standard protecting-group cycles. The free carboxylic acid and amino group allow conversion into N-protected derivatives and activated carboxyl equivalents, supporting iterative synthesis of analogs with modified side-chain electronics or appended functional groups. Downstream products can include protected amino acid building blocks, peptide coupling-ready intermediates, and chiral fragments for medicinal chemistry and peptidomimetic construction.

4. Side-Chain Functionalization

H-beta-(2-Quinolyl)-D-Ala-OH supports side-chain functionalization workflows where the quinoline ring enables targeted derivatization without disrupting the amino acid backbone. The heteroaromatic motif can be used as a platform for introducing substituents that tune basicity, polarity, and metal-chelation behavior, while maintaining the amino acid's compatibility with peptide coupling chemistry. Protecting-group strategies for the α-amino and carboxyl groups can be selected to withstand functional group transformations on the quinoline scaffold, enabling sequential synthesis of more complex heteroaryl amino acid derivatives. Resulting functionalized analogs can be applied in SAR studies, molecular design for binding selectivity, and preparation of intermediate streams for fine chemical synthesis.

5. Pharmaceutical Intermediate Preparation

H-beta-(2-Quinolyl)-D-Ala-OH is relevant to pharmaceutical intermediate preparation where heteroaryl amino acid fragments are incorporated into peptide-like or peptidomimetic chemotypes. The amino acid core provides a standardized platform for conversion into N-protected protected amino acid derivatives and activated carboxyl intermediates used in stepwise assembly of larger molecular entities. The quinoline substituent can be retained as a pharmacophore-like element, supporting medicinal chemistry exploration of conformationally constrained scaffolds and heteroaromatic recognition patterns. Process chemistry routes can employ this compound as a defined chiral starting material for manufacturing of research-grade building blocks and for generating downstream derivatives suitable for continued synthetic elaboration.

6. Analytical Research Standards

H-beta-(2-Quinolyl)-D-Ala-OH is suitable for analytical research and method development where a stereodefined heteroaryl amino acid standard is required. The combination of a free carboxylic acid and a quinoline chromophore enables strong detectability in chromatographic and spectrometric workflows, supporting quantitation and identity confirmation of related peptide or amino acid derivatives. The D-configuration and β-quinolyl substitution provide structural specificity that can help distinguish closely related alanine analogs during impurity profiling or synthetic monitoring. Quinoline-containing amino acid standards derived from this intermediate can also support calibration and reference material preparation for studies involving peptide coupling products, deprotection outcomes, and side-chain integrity verification.

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