3-(3-Thienyl)-L-alanine is an L-amino acid derivative featuring an alanine backbone bearing a 3-thienyl (thiophene) substituent on the side chain, classifying it as a nonstandard, aromatic side-chain amino acid suitable for peptide and structure-activity studies. The molecule contains a free amino group and a free carboxyl group, with the side chain presenting a heteroaromatic sulfur-containing ring that can influence hydrophobicity and π-interactions relative to aliphatic or phenyl analogues. As a labeled-by-structure building block for peptide synthesis and chemical biology workflows, it can be incorporated into synthetic peptides or used to prepare modified amino acid derivatives for binding studies, conformational analysis, and analytical method development.
CAT No: CP24302
3-(3-Thienyl)-L-alanine is a sulfur-containing, non-proteinogenic L-amino acid featuring a 3-thienyl aromatic side chain that provides distinct hydrophobic and π-interaction characteristics compared with standard aliphatic or phenylalanine-like residues. As an unprotected amino acid building block, it is commonly used in peptide and peptidomimetic synthesis where aromatic side-chain substitution is leveraged to tune structure, conformation, and physicochemical properties. In medicinal chemistry and chemical biology workflows, its heteroaromatic thienyl group also supports SAR studies and the preparation of analog series where aromatic electronics and ring substitution patterns are systematically varied.
1. Peptide And Peptidomimetics Synthesis
3-(3-Thienyl)-L-alanine is used as a side-chain-defined building block for incorporating a thienyl aromatic residue into custom peptides and peptidomimetics. Research groups developing structure-activity relationship (SAR) libraries rely on this L-amino acid to introduce a heteroaromatic ring that can alter local hydrophobicity, aromatic stacking propensity, and overall peptide conformation relative to more common phenylalanine analogs. The compound is particularly relevant for solution-phase or solid-phase peptide assembly workflows where a single, well-defined non-natural residue is needed to probe how aromatic heterocycles influence binding-site geometry and stability trends across analog panels.
2. Medicinal Chemistry SAR Building Blocks
3-(3-Thienyl)-L-alanine supports medicinal chemistry programs that require systematic variation of aromatic side-chain identity while keeping the amino acid backbone constant. Medicinal chemistry and process development teams use this building block to prepare intermediate scaffolds and analogs for lead optimization, including peptidomimetic fragments and amino acid-derived motifs where heteroaromatic electronics (thiophene versus phenyl) are used to differentiate structure-property relationships. The thienyl side chain provides a chemically distinct handle for downstream functionalization strategies in synthetic routes to analog series, enabling targeted exploration of how ring heteroatoms impact physicochemical behavior and structure-driven interactions.
3. Chemical Biology Interaction Probes
3-(3-Thienyl)-L-alanine is applied in chemical biology workflows that build peptide-based or amino-acid-derived probes to study molecular interactions through aromatic recognition and hydrophobic/π contributions. Researchers constructing affinity ligands, competition probes, or interaction-mapping analogs often choose a thienyl-containing residue to modulate contact patterns within binding pockets and to create probe series that differ primarily by aromatic heterocycle identity. By embedding this L-amino acid into probe scaffolds, teams can evaluate how thiophene incorporation changes interaction outcomes in binding assays, competition experiments, and structure-guided probe optimization campaigns.
4. Analytical Standards For LC-MS Method Development
3-(3-Thienyl)-L-alanine is also used as an analytical reference material for method development and verification in LC-based workflows that monitor amino acid analogs and peptide components containing heteroaromatic residues. Analytical chemists and bioanalytical teams may employ this compound to establish retention behavior, calibrate quantitation strategies, and support identification of thienyl-containing species in complex mixtures arising from peptide synthesis, degradation studies, or fragment-library characterization. Its defined structure makes it a practical standard for confirming chromatographic response and supporting data interpretation when thienyl-bearing amino acid derivatives are part of the analytical panel.
If you have any peptide synthesis requirement in mind, please do not hesitate to contact us at . We will endeavor to provide highly satisfying products and services.
Creative Peptides is a trusted CDMO partner specializing in high-quality peptide synthesis, conjugation, and manufacturing under strict cGMP compliance. With advanced technology platforms and a team of experienced scientists, we deliver tailored peptide solutions to support drug discovery, clinical development, and cosmetic innovation worldwide.
From custom peptide synthesis to complex peptide-drug conjugates, we provide flexible, end-to-end services designed to accelerate timelines and ensure regulatory excellence. Our commitment to quality, reliability, and innovation has made us a preferred partner across the pharmaceutical, biotechnology, and personal care industries.
Read More