Cyclic urethanes useful as antiarrhythmic and antifibrillatory agents

Abstract From the Canadian patent

The novel cyclic urethanes, and their pharmaceutically-acceptable salts and esters, described herein which are useful as antiarrhythmic and antifibrillatory agents and have general structure (I) wherein (a) X is a saturated or unsaturated 5-, 6-, or, 7-membered heterocycle or carbocycle; (b) R is selected from the group consisting of covalent bond, nil, heteroatom carbonyl, heterocyclic ring, carbocyclic ring alkyl, alkenyl, alkoxy, alkylamino, arylalkyl aryloxy, acyl, acyloxy, and acylamino; (c) Y is a substituted or unsubstituted, saturated or unsaturated 5-, 6-, or 7-membered , heterocyclic ring or carbocyclic ring or is nil; and, wherein when R is nil, X and Y are fused ring systems; …