DESIGN, SYNTHESIS, CHARACTERIZATION, AND ANTI-INFLAMMATORY EVALUATION OF NOVEL PYRAZOLE DERIVATIVES
DOI:
https://doi.org/10.29121/JISSI.v2.i1.2026.87Keywords:
Pyrazole, Heterocyclic Synthesis, Claisen-Schmidt Condensation, Anti-Inflammatory Evaluation, FT-IR, NMR, Structure-Activity Relationship (SAR), Chemical StructuresAbstract
Pyrazole constitutes an indispensable five-membered nitrogen-containing heterocyclic scaffold exhibiting broad and highly relevant applications within medicinal chemistry. This extensive research paper elucidates the systemic molecular design, step-wise synthesis, orthogonal characterization (FT-IR, 1H NMR, 13C NMR, MS), and anti-inflammatory evaluation of a novel series of substituted pyrazole derivatives. The structural framework is anchored around a 1,3,5-triaryl-1H-pyrazole core, allowing structural variations to be meticulously examined through a highly controlled analogue-design strategy. The proposed series, designated PZ-01 through PZ-08, systematically varies the para substituent on the C5 aryl ring. The substitutions map a wide physicochemical space, encompassing weak and polar electron-donating groups (methyl, methoxy), a halogen progression (fluoro, chloro, bromo), strong electron-withdrawing motifs (trifluoromethyl, cyano), and an ionizable polar boundary probe (carboxyl). The synthetic protocol relies on Claisen-Schmidt condensation to yield chalcone intermediates, followed by cyclocondensation with phenylhydrazine to form pyrazolines, and concluding with aromatization to the targeted 1H-pyrazole structure. Detailed structural characterization data is reported for all synthesized compounds. An in vitro protein denaturation assay provides the biological evaluation framework, allowing for comprehensive Structure-Activity Relationship (SAR) interpretation based on calculated IC50 values. The findings underscore the profound impact of substituent electronics, lipophilicity, and sterics on anti-inflammatory potential, paving a definitive path for future lead optimization.
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