Abstract
Aim to find new compounds with stronger anticonvulsant activity and lower neurotoxicity, a novel series of 6-substituted-pyrido[3,2-d]pyridazine derivatives was synthesized using furo[3,4-b]pyridine-5,7-dione as the starting material. We evaluated their anticonvulsant activity and neurotoxicity using by maximal electroshock (MES) and rotarod neurotoxicity (TOX) tests. The results showed that N-m-chlorophenyl-[1,2,4]triazolo- [4,3-b]-pyrido[3,2- d]pyridazin-6-amine (3) was the most potent anticonvulsant, with ED50 value of 13.6 mg/kg and protective index ( PI = TD50/ED50) values of 7.2 in the MES test. Compound N-m-chlorophenyltetriazolo[5,1-b]-pyrido[3,2-d]pyridazin-6-amine (19), exhibited significant anticonvulsant activity in maximal electroshock test with PI value of 13.4, which was safer than marketed drug carbamazepine.
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