Tricyclic benzopyran compound as anti-arrhythmic agents

Abstract

This invention relates to benzopyran derivatives of formula (I) or (II), or pharmaceutically acceptable salts thereof wherein Rand Rare independently of each other hydrogen atom, Calkyl group or Caryl group, Ris hydrogen atom or Calkylcarbonyloxy group, or together with Rforms a bond, Ris hydrogen atom, or together with Rforms a bond, m is an integer of 0 to 4, n is an integer of 0 to 4, V is a single bond, CRR, NR, O, S, SO or SO, Ris hydrogen atom or Calkyl group, Ris hydrogen atom, Calkyl group, Ccycloalkyl group, Ccycloalkenyl group, amino group, Calkylamino group, di-Calkylamino group, Carylamino group, Cheteroarylamino group, Caryl group, Cheteroaryl group or Cheterocyclyl group, A is 5-, 6- or 7-member ring fused with benzene ring, as constituent atom of the ring, oxygen atom, nitrogen atom or sulfur atom may be contained in the number of 1 to 3 alone or in a combination thereof, the number of unsaturated bond in the ring is 1, 2 or 3 including an unsaturated bond of the benzene ring to be fused, carbon atoms constituting the ring may be carbonyl or thiocarbonyl. These compounds are useful as an anti-arrhythmic agent.