COMPOUNDS OF FORMULA (I): WHEREIN: R1 AND R2, WHICH MAY BE THE SAME OR DIFFERENT, EACH REPRESENT A HYDROGEN OR HALOGEN ATOM OR AN ALKYL, ALKOXY, ALKYLTHIO, ACYL, ALKOXYCARBONYL, CARBOXY, HYDROXY, HYDROXYALKYL, CYANO, NITRO, AMINO, SUBSTITUTED OR UNSUBSTITUTED AMINOCARBONYL, AMINOSULPHONYL, ALKYLSULPHONYLAMINOALKYL, N-HYDROXY-CARBOXIMIDAMIDE OR BENZYLOXY GROUP, R3 REPRESENTS A HYDROGEN ATOM OR AN ALKYL, CYCLOALKYL OR CYCLOALKYLALKYL GROUP, R4 REPRESENTS A HYDROGEN ATOM OR A SUBSTITUTED OR UNSUBSTITUTED ALKYL GROUP, AND USE THEREOF AS POSITIVE ALLOSTERIC MODULATORS OF AMPA RECEPTORS AND ANTAGONISTS OF NMDA RECEPTORS.