Synthesis of 1-methyl-2-phenylcarbamoylpyrazolidines as potential anticonvulsant agents

Lithium aluminum hydride reduction of 1,4-dimethyl-3-pyrazolidinone yielded 1,4-dimethylpyrazolidine. The latter compound and 1-methylpyrazolidine reacted with aryl isocyanates to produce 1-methyl-2-phenylcarbamoylpyrazolidines. Several of these adducts displayed significant anticonvulsant activity in the maximal electroshock seizure and pentylenetetrazol seizure threshold tests.