Synthesis and anticonvulsant activity of new 3-[(2-furyl)carbonyl]amino-4-thiazolidinone and 2-[(2-furyl)carbonyl]hydrazono-4-thiazoline derivatives.

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A series of new 2-aryl-3-[(2-furyl)carbonyl]amino-5-nonsubstituted/methyl-4-thi azolidinones (3) and 2-[(2-furyl)carbonyl]hydrazono-3-alkyl-4-aryl-4-thiazolines (5) was synthesized and evaluated for anticonvulsant activity against pentylenetetrazole induced seizures. Preliminary results indicated that potency was sensitive to substituents at the 2 and 5 positions of the 4-thiazolidinone and 3 and 4 positions of the 4-thiazoline rings. Among 3,2-(phenyl)/ (4-fluorophenyl)-3-[(2-furyl)carbonyl]amino-5-methyl-4-thiazolidinone s (3e and 3f) and among 5, 2-[(2-furyl)carbonyl]hydrazono-3-allyl-4-(4-bromophenyl)-4-thiazol ine (5e), showed the highest protection (40%).