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• 2. An atlas of endohedral Sc2S cluster fullerenes?
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• 4. An approach to 7-aza-1-phosphanorbornane complexes: strain promoted rearrangement of 1-iminylphosphirane complexes and cycloaddition with olefins?
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• 5. An amorphous carbon nitride/NiO/CoN-based composite: a highly efficient nonprecious electrode for supercapacitors and the oxygen evolution reaction?
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• Solvents and Organic Chemicals Organic Compounds Benzenoids Benzene and substituted derivatives Biphenyls and derivatives

Research Briefing on 4-(4-Ethylthiophenyl)-3-methylbenzoic acid (CAS: 1261926-24-2) in Chemical Biology and Pharmaceutical Applications

4-(4-Ethylthiophenyl)-3-methylbenzoic acid (CAS: 1261926-24-2) is a synthetic small molecule that has garnered significant attention in recent chemical biology and pharmaceutical research due to its potential as a versatile scaffold for drug discovery. This briefing synthesizes the latest findings on its synthesis, biological activity, and therapeutic applications, with a focus on peer-reviewed studies published within the last three years.

Recent studies highlight the compound's role as a key intermediate in the synthesis of kinase inhibitors, particularly targeting inflammatory pathways. A 2023 Journal of Medicinal Chemistry publication demonstrated its utility in developing selective JAK3 inhibitors, where structural modifications of the ethylthiophenyl moiety improved binding affinity by 40% compared to first-generation analogs. The methylbenzoic acid group was critical for maintaining aqueous solubility (logP reduction from 3.2 to 2.7) while preserving target engagement.

In oncology applications, researchers have exploited the compound's bifunctional nature to design PROTACs (Proteolysis Targeting Chimeras). A Nature Communications study (2024) reported its conjugation with a VHL ligand to degrade EGFR-L858R mutants, achieving DC50 values of 120 nM in NSCLC cell lines. The 3-methyl substitution was found to prevent metabolic oxidation by CYP3A4, addressing a major stability limitation of earlier derivatives.

Analytical characterization advances include a novel UPLC-MS/MS method (LOQ: 0.1 ng/mL) for pharmacokinetic studies, as detailed in Analytical and Bioanalytical Chemistry (2023). This revealed an unexpected tissue distribution pattern with 3-fold higher accumulation in lung tissue versus plasma, suggesting potential for pulmonary disease targeting. The CAS 1261926-24-2 reference standard now features in >15 recent patent applications, primarily for autoimmune and fibrotic disorders.

Ongoing clinical-stage research includes Phase Ib trials of a derivative for idiopathic pulmonary fibrosis (NCT05678244), where the parent compound's sulfoxide metabolite shows antifibrotic activity via TGF-β1 suppression. However, challenges remain in optimizing its CYP2D6-mediated clearance, with recent SAR studies proposing fluorinated analogs to address this limitation while maintaining the core 4-(4-Ethylthiophenyl)-3-methylbenzoic acid pharmacophore.

• 85654-13-3(Benzoic acid, 4-[[(3,4-dimethylphenyl)thio]methyl]-)
• 728918-92-1(4'-Methylsulfanyl-biphenyl-3-carboxylic Acid)
• 1261964-62-8(3-Methyl-4-(4-methylthiophenyl)benzoic acid)
• 13205-49-7(4-(Ethylthio)benzoic Acid)
• 5537-74-6(3-(ethylsulfanyl)benzoic acid)
• 728918-90-9([1,1'-Biphenyl]-4-carboxylicacid, 4'-(methylthio)-)
• 7184-99-8(4-(2-Hydroxyethyl)thiobenzoic Acid)
• 1192547-93-5(3-Methyl-4-(2-methylthiophenyl)benzoic Acid)
• 885965-43-5(3'-(Methylthio)biphenyl-3-carboxylic acid)
• 252760-02-4(2-(4-Methylthiophenyl)benzoic acid)