| abstract |
Compounds of formula (I) and pharmaceutically acceptable salts and solvates: n n n where R 1 is hydrogen, C 1-6 alkyl (optionally substituted by hydroxy or C 1-4 alkoxy), phenyl-C 1-4 alkyl-, C 1-6 alkenyl, C 1-6 alkynyl; n R 2 is hydrogen or up to three substituents selected from halogen, NO 2 , CN, N 3 , CF 3 O—, CF 3 S—, CF 3 CO—, C 1-6 alkyl, C 1-6 alkenyl, C 1-6 alkynyl, C 1-6 perfluoroalkyl, C 3-6 cycloalkyl, C 3-6 cycloalkyl-C 1-4 alkyl-, C 1-6 alkylO—, C 1-6 alkylCO—, C 3-6 cycloalkylO—, C 3-6 cycloalkylCO—, C 3-6 cycloalkyl-C 1-4 alkylO—, C 3-6 cycloalkyl-C 1-4 alkylCO—, phenyl, phenoxy, benzyloxy, benzoyl, phenyl-C 1-4 alkyl-, C 1-6 alkylS—, C 1-6 alkylSO 2 —, (C 1-4 alkyl) 2 NSO 2 —, (C 1-4 alkyl)NHSO 2 —, (C 1-4 alkyl) 2 NCO—, (C 1-4 alkyl)NHCO— or CONH 2 ; n or —NR 5 R 6 where R 5 is hydrogen or C 1-4 alkyl, and n R 6 is hydrogen, C 1-4 alkyl, formyl, —CO 2 C 1-4 alkyl or —COC 1-4 alkyl; n or two R 2 groups together form a carbocyclic ring that is saturated or unsaturated. n R 3 groups and R 4 groups are each independently hydrogen or C 1-6 alkyl and/or the two R 3 groups and/or the two R 4 groups together form a C 3-6 spiroalkyl group, provided that at least one R 3 or R 4 group is not hydrogen; and n X is selected from hydrogen, halogen, cyano, alkyl and alkoxy. are useful in the treatment and prophylaxis of epilepsy, migraine, and other disorders. |