Synthesis of Novel Substituted Thiourea and Benzimidazole Derivatives Containing a Pyrazolone Ring as Anti-Inflammatory Agents
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Facile Preparation of 4-Substituted Quinazoline Derivatives
Published on: February 15, 2016
Ashraf A Moneer1, Khaled O Mohammed1, Hala B El-Nassan1
1Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Cairo University, Cairo, 11562, Egypt.
Abstract:
Two series of new 1-(alkyl/aryl)-3-{2-[(5-oxo-4,5-dihydro-1H-pyrazol-3-yl)amino]phenyl}thioureas 2a-h and 5-[2-(substituted amino)-1H-benzimidazol-1-yl]-4H-pyrazol-3-ols 3a-i were designed and synthesized as anti-inflammatory agents. The cyclooxygenase inhibitory activity of the newly synthesized compounds was investigated. All the compounds showed non-selective inhibition of COX-1 and COX-2 enzymes which was consistent with their docking results. Compounds 2c, 2f, 2g, 3b, and 3g that showed the highest COX-2 inhibitory activity were selected for further in vivo testing as anti-inflammatory agents using diclofenac as a reference drug. Two of the test compounds (2c and 3b) showed potent anti-inflammatory activity comparable to that of diclofenac with lower ulcerogenic effect relative to indomethacin. SAR study of the two series as cyclooxygenase inhibitors and anti-inflammatory agents was also provided.
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