Pyrimidinedione derivatives and antiarrythmic agents containing the same

Abstract

A pyrimidinedione derivative compound has a basic backbone in which a phenyl group part and a pyrimidinedione part are linked by a linking structure comprising an alkyl chain containing two nitrogen atoms. This linking structure is represented by ##STR1## [wherein A is --(CH.sub.2).sub.n --, --CO-- or --O--(CH.sub.2).sub.m --; each of R.sup.1 and R.sup.2 is independently a hydrogen atom or a lower alkyl group which may be substituted by a hydroxyl group, or R.sup.1 and R.sup.2 may be so linked with each other as to make an alkylene chain and thus form a heterocyclic structure; R.sup.5 is a halogen atom, a hydroxyl group, a lower alkyloxycarbonyl group, a lower alkyloxy group which may be substituted by a lower alkyloxy group, or a lower alkyl group which may be substituted by a hydroxyl group, or R.sup.5 may be so linked with R.sup.1 as to make an alkylene chain and thus form a heterocyclic structure; n is 0, 1, 2 or 3 (when R.sup.5 is the hydroxyl group, n.noteq.0); m is 0, 1, 2 or 3; and k is 0, 1, 2 or 3 (however, a compound in which A is --O--(CH.sub.2).sub.m -- and R.sup.5 is the hydroxyl group is excluded from the pyrimidinedione derivative)]. The pyrimidinedione derivative and its acid addition salt are useful for a medical treatment of cardiac arrhythmias.