H-beta-(3-Benzothienyl)-D-Ala-OH

H-beta-(3-Benzothienyl)-D-Ala-OH is a chiral, D-configured alanine derivative bearing a side-chain substituent at the β-position with a 3-benzothienyl (benzothiophene) aromatic group. The molecule contains a free carboxylic acid and a stereogenic center at the α-carbon, enabling stereochemically defined incorporation into peptide-like frameworks or use as a chiral building block for amino acid derivatization. The benzothienyl substituent introduces a rigid, π-rich heteroaromatic functionality that can participate in hydrophobic and π-stacking interactions while remaining chemically stable under many peptide coupling conditions. The combination of an amino acid backbone and a heteroaromatic side chain supports downstream transformations such as N-protection for peptide synthesis, side-chain functional modification, and conversion into activated acid derivatives for fragment assembly in synthetic organic chemistry.

1. Peptide Synthesis

H-beta-(3-Benzothienyl)-D-Ala-OH is applicable to peptide building block preparation where stereodefined D-amino acid incorporation is required. The free carboxylic acid enables conversion to activated coupling forms, while the α-chiral center and β-benzothienyl substituent allow construction of peptide sequences with controlled side-chain topology. N-protection strategies commonly used for amino acids can be applied to manage chemoselectivity during coupling, including formation of amide bonds without perturbing the benzothiophene aromatic system. The resulting D-β-(benzothienyl) alanine residues can be used to generate peptide analogs and peptidomimetics with altered conformational preferences and aromatic side-chain presentation.

2. Peptidomimetics And SAR

H-beta-(3-Benzothienyl)-D-Ala-OH supports structure-activity relationship studies by providing a defined stereochemical handle paired with a heteroaromatic benzothienyl side chain. The β-position substitution differentiates this residue from canonical alanine, enabling systematic variation of aromatic surface area and side-chain geometry in peptide-mimetic scaffolds. Side-chain stability under standard amide-forming conditions makes it suitable for iterative analog construction, while the D-configuration can be used to tune backbone orientation and resistance to proteolysis in peptide-like designs. Downstream derivatives can be assembled into libraries for SAR mapping, where the benzothienyl group serves as a consistent pharmacophore element for comparative studies.

3. Chemical Biology Probes

H-beta-(3-Benzothienyl)-D-Ala-OH can be employed in chemical biology research as an amino acid-derived scaffold for molecular recognition and labeling strategies. The benzothiophene moiety provides an aromatic platform that can be leveraged for conjugation workflows, including attachment to linkers or incorporation into larger biomolecule-binding constructs after appropriate protection and activation of the amino acid functionality. The free carboxylic acid can be transformed into coupling-ready intermediates for attachment to amines or other nucleophiles, enabling generation of conjugates that preserve the stereochemical identity of the D-amino acid. The resulting labeled or probe-like constructs can be used to probe binding interactions, track peptide analog behavior, or support affinity-based assays where aromatic side-chain presentation is a key design element.

4. Protected Amino Acid Chemistry

H-beta-(3-Benzothienyl)-D-Ala-OH is suitable for protected amino acid synthesis and intermediate preparation where orthogonal functional group management is needed. The presence of both a stereogenic α-carbon and a free carboxylic acid allows selective protection of the amine and controlled activation or esterification of the acid for stepwise assembly. N-protection can be used to support peptide coupling chemistry while maintaining the benzothienyl group intact, and carboxyl activation strategies can enable conversion into peptide coupling reagents or protected acid derivatives for fragment condensation. The protected amino acid derivatives derived from this scaffold can serve as reliable intermediates for manufacturing-oriented fine chemical synthesis routes and for reproducible peptide building block workflows.

5. Chiral Building Block Intermediate

H-beta-(3-Benzothienyl)-D-Ala-OH functions as a chiral amino acid intermediate for stereoselective synthesis of heteroaromatic-containing molecules. The D-configuration provides a defined stereochemical outcome at the α-center, supporting downstream transformations that rely on stereochemical fidelity, such as incorporation into oligomers or conversion into chiral acid derivatives for fragment coupling. The benzothienyl substituent contributes a rigid aromatic motif that can be carried through multi-step syntheses without losing the core structural identity, supporting the build-up of aromatic-rich scaffolds. The compound can be applied to the preparation of process chemistry intermediates and specialty chemical intermediates where controlled stereochemistry and heteroaromatic functionality are required for consistent downstream product formation.

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