Synthesis, physicochemical and anticonvulsantproperties of new N‐Mannichbases 3–24 derivedfrom 5‐cyclopropyl‐5‐phenyl‐ and 5‐cyclopropyl‐5‐(4‐chlorophenyl)‐hydantoins were described here. Initial anticonvulsant screening was performed using intraperitoneal (i.p.) maximal electroshock (MES) and subcutaneous pentylenetetrazole (scPTZ) seizures tests. Selected derivatives were also screened in the