Synthesis and anticonvulsant activities of functionalized 5-(isoindole-1,3-dione)-pyrimidinones

The present work involves the synthesis of previously unknown 5-(isoindole-1,3-dione) pyrimidinones by [4 + 2] cycloaddition reactions of functionalized 1,3-diazabuta-1,3-dienes with phthalimidoketene, generated in situ from phthaloylglycine, tosyl chloride, and triethylamine. The 5-(isoindole-1,3-dione)-pyrimidinones have been screened in vivo for their anticonvulsant activities using MES and PTZ methods. A comparative study for in vivo anticonvulsant activities of these functionalized pyrimidinones with a variety of substitutions at different positions was also conducted. 2-(4-Dimethylamino-6-oxo-1,2-diphenyl-1,6-dihydro-pyrimidin-5-yl)-isoindole-1,3-dione has shown the maximum anticonvulsant activities at 100 mg/kg test dose using MES and PTZ tests.