A series of 3-[(4-substituted-benzylidene)-amino]-2-phenyl-3H-quinazolin-4-ones (5a-k) were synthesized by reacting 3-amino-2-phenyl-1H-quinazolin-4-one with p-hydroxybenzaldehyde, and then further with various alkyl/benzyl halides or substituted phenacyl bromides. The structures of the compounds were confirmed on the basis of IR, NMR, MS and elemental analysis. Anticonvulsant activities were evaluated using the MES and scPTZ tests. Some of the selected compounds were evaluated for antidepressant activity by forced swim pool test. Compound 3-[(4-butoxy-benzylidene)-amino]-2-phenyl-3H-quinazolin-4-one was emerged as the most promising anticonvulsant agent without any motor impairment effect. The whole brain GABA estimation of brain homogenate indicated that the anticonvulsant activity of above mentioned quinazolinone derivatives might be due to an increased GABA concentration.
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