Some 6-Phenyl/Biphenyl-4-yl-2-[2-(pyridin-2-ylamino)-ethyl]/-2-(2N-subtituted amin-1-yl)-ethyl-4,5-
dihydropyridazin-3(2H)-one (4a-h) were synthesized by reacting 6-phenyl/biphenyl-4,5-dihydropyridazin-3(2H)-one with
bromoethyl derivatives of cyclic secondary amines and 2-aminopyridine. All the compounds, 4a-h, were evaluated as
anticonvulsant by using maximum electro shock (MES) and isoniazid (INH) induced convulsion methods at 50mg/kg
dose level, and as antitubercular by Microplate Almar Blue Assay (MABA) method. In anticonvulsant activity, phenytoin
(25mg/kg) and sodium vaproate (50mg/kg) were used as reference drugs. All compounds (4a-h) showed significant anticonvulsant
activities against both MES and INH methods, and compound g showed highest activity against MES method.
In antitubercular activity, compounds 4c-4h showed 25 μg/ml MIC value, and compounds 4a-4b exhibited 50 µg/ml MIC
value when compared with reference drugs [isoniazid (3.125 µg/ml), pyrizinamide (3.125µg/ml)] and (streptomycin
6.25μg/ml) MIC values, and found less potent than the reference drugs.
Keywords: Anticonvulsant, Antitubercular, Biological activities, Heterocyclic, Pyridazinone, Synthetic compounds.
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