Synthesis and Evaluation on Anticonvulsant Activities of Pyrazolyl Semicarbazones
作者:Xian-Qing Deng、Ming-Xia Song、Hai-Hong Yu
DOI:10.14233/ajchem.2014.18218
日期:——
In this paper, a series of 2-[(5-phenoxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)-methylene]hydrazine carboxamides were synthesized and evaluated for their anticonvulsant activities using the maximal electroshock method. Their neurotoxicities were determined applying the rotarod test. Interestingly, all compounds showed anticonvulsant activity with long duration of protection effects in the maximal electroshock test. Among which, compound 5m was found to have promising anticonvulsant activity, which gave an ED50 of 42.4 mg/kg and a protective index value of 3.7, possessing better anticonvulsant activity and higher safety than marketed drugs valproate, but weaker than phenobarbital. Furthermore, the antagonistic activity against seizures induced by pentylenetetrazole of the compound 5m was also established, which suggested that compound 5m may exert anticonvulsant activity through g-aminobutyric acid (GABA)-mediated mechanisms.
本文中,我们合成了一系列2-[(5-苯氧基-3-甲基-1-苯基-1H-吡唑-4-基)-亚甲基]酰肼羧酰胺,并利用最大电休克法评估了它们的抗惊厥活性。通过旋转棒试验测定了它们的中枢神经毒性。有趣的是,所有化合物在最大电休克试验中均显示出抗惊厥活性,且保护效果持久。其中,化合物5m表现出有前景的抗惊厥活性,其ED50为42.4 mg/kg,保护指数值为3.7,抗惊厥活性优于市场药物丙戊酸,但弱于苯巴比妥,并且安全性更高。此外,化合物5m对戊四氮诱导的惊厥也有拮抗活性,这表明化合物5m可能通过γ-氨基丁酸(GABA)介导的机制发挥抗惊厥作用。