Compound 4a had a higher protective index (PI = $TD_{50}/ED_{50}$) value (16.6) than phenytoin (PI = 7.0), and it antagonized pentylenetetrazole- and isoniazid-induced seizures with an ED50 of 21.1 mg $kg^{−1}$ and 83.3 mg $kg^{−1}$, respectively.
📌 3 Key Takeaways
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Objective & Hypothesis:A new series of 1-substituted-7-methoxy-5-phenyl-1,2,4-triazolo[4,3-a]quinolines were synthesized using ethyl-3-oxo-3-phenylpropanoate and 4-methoxybenzenamine as the starting material.
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Key Findings & Data:Their anticonvulsant activity was evaluated by the maximal electroshock (MES) test and 7-methoxy-5-phenyl-1,2,4-triazolo[4,3-a]quinoline (4a) was identified as the most potent compound, with an $ED_{50}$ value of 9.2 mg $kg^{−1}$, which is comparable to the reference drug phenytoin ($ED_{50}$ = 9.9 mg $kg^{−1}$).
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Conclusion & Impact:Compound 4a had a higher protective index (PI = $TD_{50}/ED_{50}$) value (16.6) than phenytoin (PI = 7.0), and it antagonized pentylenetetrazole- and isoniazid-induced seizures with an ED50 of 21.1 mg $kg^{−1}$ and 83.3 mg $kg^{−1}$, respectively.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters
Abstract
A new series of 1-substituted-7-methoxy-5-phenyl-1,2,4-triazolo[4,3-a]quinolines were synthesized using ethyl-3-oxo-3-phenylpropanoate and 4-methoxybenzenamine as the starting material. Their anticonvulsant activity was evaluated by the maximal electroshock (MES) test and 7-methoxy-5-phenyl-1,2,4-triazolo[4,3-a]quinoline (4a) was identified as the most potent compound, with an $ED_{50}$ value of 9.2 mg $kg^{−1}$, which is comparable to the reference drug phenytoin ($ED_{50}$ = 9.9 mg $kg^{−1}$). To explore the possible mechanism of its anticonvulsant activity, compound 4a was tested with the rotarod neurotoxicity test, pentylenetetrazole (sc-PTZ) test, and isoniazid test. Compound 4a had a higher protective index (PI = $TD_{50}/ED_{50}$) value (16.6) than phenytoin (PI = 7.0), and it antagonized pentylenetetrazole- and isoniazid-induced seizures with an ED50 of 21.1 mg $kg^{−1}$ and 83.3 mg $kg^{−1}$, respectively.
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Cite This Article
SUN, X., CHI, K., TIAN, G., GUAN, L., QUAN, Z. (2022). The synthesis and anticonvulsant activity of 1-substituted-7-methoxy-1,2,4,-triazolo [4, 3-a] quinoline. Turkish Journal of Chemistry, Cilt: 32 - Sayı: 2, 181–189. https://ajindex.com/articles/602149