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Chemical and Biological Insights into 5-(2,4-Dimethylphenyl)Isoxazole-3-Carboxylic Acid (CAS No. 953753-81-6)

Among the diverse array of heterocyclic compounds studied in medicinal chemistry, 5-(2,4-dimethylphenyl)isoxazole-3-carboxylic acid (CAS No. 953753-81-6) has emerged as a promising scaffold for exploring pharmacological activities. This compound represents a unique fusion of structural elements: the central isoxazole ring—a five-membered heterocycle known for its stability and bioactivity—substituted at position 5 with a 2,4-dimethylphenyl group and bearing a carboxylic acid moiety at position 3. Such structural features position this molecule as an ideal candidate for modulating biological targets through ligand-receptor interactions.

The synthesis of this compound typically involves multistep organic synthesis, starting from readily available aromatic precursors. Recent advancements in transition-metal-catalyzed coupling reactions have streamlined its preparation. For instance, a 2023 study published in Journal of Medicinal Chemistry demonstrated the use of palladium-catalyzed Suzuki-Miyaura cross-coupling to introduce the dimethylphenyl substituent with high regioselectivity. This method not only enhances yield but also reduces synthetic steps compared to traditional approaches involving Grignard reagents.

Biochemical studies reveal that this compound exhibits dual pharmacological profiles. In vitro assays against human cancer cell lines (e.g., MCF-7 and HeLa) showed significant cytotoxicity with IC?? values below 10 μM, suggesting potential applications in oncology. A groundbreaking 2024 paper in Nature Communications identified its ability to inhibit histone deacetylase (HDAC) enzymes—a mechanism linked to epigenetic regulation—thereby inducing apoptosis in tumor cells through chromatin remodeling pathways. This dual action distinguishes it from conventional HDAC inhibitors by combining direct cytotoxicity with epigenetic modulation.

In neurodegenerative disease research, this compound has shown neuroprotective properties through Nrf2 pathway activation. Preclinical models of Parkinson's disease demonstrated dose-dependent reductions in α-synuclein aggregation and mitochondrial dysfunction when administered at sub-micromolar concentrations. These findings align with computational docking studies indicating favorable binding affinity for PPARγ receptors—a target implicated in neuroinflammation regulation—as reported in a 2024 Bioorganic & Medicinal Chemistry Letters article.

Safety pharmacology evaluations using murine models revealed an LD?? exceeding 1 g/kg when administered intraperitoneally, indicating favorable acute toxicity profiles compared to structurally similar isoxazoles lacking the dimethyl substitution. Chronic toxicity studies over 16 weeks showed no significant organomegaly or hematological abnormalities at therapeutic doses (up to 100 mg/kg/day), though transient liver enzyme elevations were observed at higher concentrations requiring further investigation.

The structural versatility of this molecule enables functionalization strategies for improving drug-like properties. Researchers have explored substituent modifications on the phenyl ring—such as fluorination at the para-position—to optimize physicochemical parameters like lipophilicity (logP). A recent study published in EurJ Med Chem demonstrated that introducing a trifluoromethyl group at position 4 increased brain penetration by over twofold while maintaining HDAC inhibitory activity.

In infectious disease applications, this compound displayed moderate antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA), achieving MIC values of 8–16 μg/mL in disk diffusion assays. While suboptimal compared to frontline antibiotics like vancomycin, its ability to disrupt bacterial biofilm formation suggests potential synergistic combinations with existing therapies as highlighted in a 2024 Antimicrobial Agents and Chemotherapy publication.

Critical analysis of structure-property relationships reveals that the dimethyl groups play dual roles: stabilizing the isoxazole ring through electron donation while modulating plasma protein binding affinity. Molecular dynamics simulations conducted by an MIT research group indicated that these substitutions reduce conformational flexibility by ~40%, enhancing target specificity while maintaining metabolic stability against phase I biotransformation enzymes.

Clinical translation efforts are currently focused on optimizing prodrug formulations to address solubility limitations observed during early preclinical trials. A patent filed in Q1/2024 describes ester prodrugs designed using hydrophilic side chains that achieve dissolution rates exceeding 90% within two hours under simulated gastrointestinal conditions—a critical improvement for oral delivery systems.

This compound's unique combination of structural features and multi-target activities underscores its value as a lead molecule for drug discovery programs targeting cancer epigenetics and neurodegenerative diseases. Continued exploration of its mechanistic pathways using CRISPR-based knockout models alongside advanced metabolomics profiling will be essential for unlocking its full therapeutic potential while mitigating off-target effects.

• 1017432-85-7(5-(2,5-dimethylphenyl)isoxazole-3-carboxylic acid)
• 33282-21-2(5-(4-Methylphenyl)isoxazole-3-carboxylic Acid)
• 14441-90-8(5-phenyl-1,2-oxazole-3-carboxylic acid)
• 668970-81-8(3-Isoxazolecarboxylic acid, 5-(2-methylphenyl)-, methyl ester)
• 109558-73-8(5-{[1,1'-biphenyl]-4-yl}-1,2-oxazole-3-carboxylic acid)
• 745078-94-8(3-ISOXAZOLECARBOXYLIC ACID, 5,5'-[1,1'-BIPHENYL]-3,3'-DIYLBIS-)
• 1375064-71-3(5-(4-Carboxyphenyl)isoxazole-3-carboxylic Acid)
• 887979-11-5(5-(3-Methylphenyl)-1,2-oxazole-3-carboxylic acid)
• 668970-80-7(5-(2-methylphenyl)-1,2-oxazole-3-carboxylic acid)
• 33282-15-4(5-(4-hydroxyphenyl)-1,2-oxazole-3-carboxylic acid)