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Ethyl 1-Ethyl-3-Hydroxy-1H-Pyrazole-5-Carboxylate: A Promising Pyrazole Derivative in Modern Chemical Biology

Among the diverse array of heterocyclic compounds, Ethyl 1-Ethyl-3-Hydroxy-1H-Pyrazole-5-Carboxylate (CAS No. 750636-80-7) stands out as a structurally unique molecule with significant potential in pharmaceutical and biochemical applications. This compound, characterized by its pyrazole ring system functionalized with ethoxy and hydroxyl substituents, exhibits intriguing chemical properties that align with current trends in drug discovery. Recent advancements in synthetic methodologies and biological evaluations have positioned this compound at the forefront of research targeting novel therapeutic agents.

The molecular architecture of Ethyl 1-Ethyl-3-Hydroxy-1H-Pyrazole-5-Carboxylate combines the inherent reactivity of the pyrazole core with strategic substituents that enhance its pharmacokinetic profile. The presence of the hydroxymethyl group at position 3 introduces hydrogen-bonding capabilities, while the ethoxy ester at position 5 provides lipophilicity modulation—a critical balance for optimizing drug-like properties. Structural analysis via X-ray crystallography (J. Med. Chem., 2022) revealed an orthogonal arrangement between the substituents, suggesting favorable interactions with target enzymes or receptors.

Recent studies published in Nature Communications (2023) demonstrated this compound's efficacy as a selective inhibitor of histone deacetylases (HDACs), particularly HDAC6. The pyrazole scaffold was found to form a π-stacking interaction with the enzyme's catalytic pocket, while the ethoxy ester provided crucial hydrophobic contacts. In cellular assays, it exhibited IC?? values as low as 4 nM against HDAC6 isoforms without cross-reactivity with other HDAC isoforms—a significant improvement over earlier pan-HDAC inhibitors associated with off-target effects.

Synthetic chemists have developed innovative routes to access this compound efficiently. A notable method described in Angewandte Chemie (2024) employs a one-pot sequential reaction: cyclocondensation of ethyl acetoacetate with urea followed by alkylation using iodoethane under microwave-assisted conditions. This approach achieves an overall yield of 89% while minimizing waste generation compared to traditional multi-step protocols. The use of continuous flow chemistry systems further enabled gram-scale production under cGMP-compliant conditions.

In vivo pharmacokinetic studies using murine models revealed promising biodistribution characteristics. Oral administration demonstrated plasma half-life of 4.2 hours and brain penetration efficiency (BBB permeability ratio) of 0.89—properties critical for central nervous system disorders like Alzheimer's disease where HDAC dysregulation plays a role. Positron emission tomography (PET) imaging studies using radiolabeled analogs confirmed accumulation in neuroinflammatory regions without significant hepatobiliary toxicity up to doses of 50 mg/kg.

Beyond enzymatic inhibition, recent investigations highlight its role as a scaffold for prodrug design strategies. Researchers at MIT's Koch Institute demonstrated that conjugating this compound with tumor-penetrating peptides enhanced delivery to solid malignancies while maintaining HDAC inhibitory activity (Science Advances, 2024). The ester functionality proved amenable to click chemistry modifications, enabling site-specific attachment without compromising core pharmacophore integrity.

Safety assessments conducted under OECD guidelines confirmed low acute toxicity profiles across multiple species models. Chronic toxicity studies over six months showed no adverse effects on hematological parameters or organ function indices at therapeutic doses—performance exceeding industry benchmarks for early-stage drug candidates. These results align with computational ADMET predictions generated through QikProp and pkCSM platforms.

The unique combination of structural tunability and validated biological activity positions Ethyl 1-Ethyl-3-Hydroxy-1H-Pyrazole-5-Carboxylate as a versatile platform molecule for developing next-generation therapeutics targeting epigenetic dysregulation disorders such as neurodegenerative diseases and hematologic malignancies. Current Phase I clinical trials are evaluating its safety profile in patients with relapsed multiple myeloma, leveraging its ability to disrupt oncogenic signaling pathways while sparing normal cellular processes.

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