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Abstract

This invention concerns a compounds of generic formula: ##STR1## or a pharmaceutically acceptable salt thereof, where the dotted lines represent optional bonds with the nitrogen ring optional bonds being between one adjacent pair on ring atoms, R.sup.3 is an optionally substituted C.sub.6 -C.sub.10 aryl or heteroaryl group; said aryl or heteroaryl radicals being optionally substituted by one or more substituents the same or different, R.sup.4 represents hydrogen, or a group of formula --CR.sup.a R.sup.b R.sup.c where R.sup.a, R.sup.b and R.sup.c are independently selected from hydrogen, C.sub.1 -C.sub.6 alkyl, optionally substituted C.sub.6 -C.sub.10 aryl, optionally substituted heteroaryl, C.sub.1 -C.sub.6 alkyl substituted by optionally substituted C.sub.6 -C.sub.10 aryl or heteroaryl, R' represents one or more optional substituents the same or different, selected from one or more of the following: halogen, C.sub.1 -C.sub.6 alkyl, C.sub.2 -C.sub.7 alkoxycarbonyl, C.sub.1 -C.sub.6 hydroxyalkyl, CN, aminocarbonyl, C.sub.2 -C.sub.7 alkanoyloxy(C.sub.1 -C.sub.6)alkyl, carboxy, C.sub.2 -C.sub.7 alkanoxyamino, optionally substituted C.sub.6 -C.sub.10 or heteroaryl or an optionally substituted (C.sub.6 -C.sub.10 aryl)alkyl or a heteroaryl alkyl radical; said aryl or heteroaryl radicals being optionally substituted by one or more substituents the same or different, and R.sup.' represents one or more optional mono- or di- valent substituents in the 5, 7 or 8 positions the same or different: monovalent substituents being selected from the following: C.sub.1 -C.sub.6 alkyl, C.sub.2 -C.sub.7 alkanoyloxy, hydroxy, amino, C.sub.2 -C.sub.7 alkanoylamino, C.sub.1 -C.sub.6 alkylamino, C.sub.1 -C.sub.6 hydroxalkyl, R.sup.' can also represent hydroxy in the 6 position (when the optional bond is absent); the di-valent substituents being selected from oxo (i.e.dbd.O) and methylene (i.e .dbd.CH.sub.2). which compounds have pharmaceutical uses conferred by their ability to block voltage gated potassium channels.

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First Claim