A large group of 3-methylidene, 5-methylidene, and 3,5-dimethylidene derivatives, as well as pyrrolo-[3,4-b]indole and pyrrolo[3,4-b]quinoline derivatives, has been synthesized on the basis of pyrrolidine-2,4-dione (tetramic acid). Some of the synthesized 3,5-disubstituted pyrrolidine-2,4-diones exhibit anticonvulsant activity.
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