Importance

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Abstract

This invention concerns a compound of generic formula ##STR1## or a pharmaceutically acceptable salt thereof, where the dotted lines represent optional bonds, R.sup.3 is an optionally substituted C.sub.6 -C.sub.10 aryl or heteroaryl group; 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 C.sub.6 -C.sub.10 aryl, 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 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 alkanoxylamino, C.sub.6 -C.sub.10 or heteroaryl or an (C.sub.6 -C.sub.10 aryl)alkyl or a heteroaryl alkyl radical; R' represents one or more optional mono- or di- valent substituents in the 5, 7 or 8 positions selected from 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 hydroxyalkyl, and R' can also represent hydroxy in the 6 position when the optional bond is absent; oxo and methylene; which compounds have pharmaceutical uses conferred by their ability to block voltage gated potassium channels.

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First Claim