Progress toward the Development of a Safe and Effective Agent for Treating Reentrant Cardiac Arrhythmias: Synthesis and Evaluation of Ibutilide Analogues with Enhanced Metabolic Stability and Diminished Proarrhythmic Potential
摘要:
A series of ibutilide analogues with fluorine substituents on the heptyl side chain was prepared and evaluated for class III antiarrhythmic activity, metabolic stability, and proarrhythmic potential. It was found that fluorine substituents stabilized the side chain to metabolic oxidation. Many of the compounds also retained the ability to increase the refractoriness of cardiac tissue at both slow and fast pacing rates. The potential for producing polymorphic ventricular tachycardia in the rabbit model was dependent on the chirality of the benzylic carbon. The S-enantiomers generally had less proarrhythmic activity than the corresponding racemates. One compound from this series (45E, trecetilide fumarate) had excellent antiarrhythmic activity and metabolic stability and was devoid of proarrhythmic activity in the rabbit model. It was chosen for further development.
[EN] ANTIARRHYTHMIC (S)-ENANTIOMERS OF METHANESULFONAMIDES<br/>[FR] ENANTIOMERES (S) DE METHANE-SULFONAMIDES ANTIARYTHMIQUES
申请人:PHARMACIA & UPJOHN COMPANY
公开号:WO1996021643A1
公开(公告)日:1996-07-18
(EN) (S)-Enantiomeric methanesulfonamides are structurally depicted by formula (I) or its pharmacologically acceptable salts where R3 is a C1-9 alkyl substituted with one fluorine atom. These compounds are useful as Class III antiarrhythmic agents without the undesirable side effect of polymorphic ventricular tachycardia (PVT) and are stable against rapid metabolism. Use of the compounds of formula (I) in the preparation of compositions for treating cardiac arrhythmias are also described.(FR) Méthane-sulfonamides énantiomères (S) décrits, au point de vue de la structure, par la formule (I) ou les sels pharmacologiquement acceptables du composé décrit par celle-ci, où R3 est un alkyle en C1-C9 substitué avec un atome de fluor. Ces composés sont utiles en tant qu'agents antiarythmiques de classe III n'ayant pas l'effet secondaire indésirable qu'est la tachycardie ventriculaire polymorphe et sont stables vis-à-vis d'un métabolisme rapide. L'invention décrit également l'utilisation desdits composés de formule (I) dans des préparations servant au traitement d'arythmies cardiaques.
Methanesulfonamides are structurally depicted by Formula I' ##STR1## or its pharmacologically acceptable salts where R.sub.3 is a C.sub.1-7 alkyl substituted with C.sub.3-7 cycloalkyl, or a C.sub.1-10 alkyl substituted with one to eight fluorine atoms, one to three hydroxy, one to three C.sub.1-5 acyloxy or one to three C.sub.1-4 alkoxy substituents. These compounds are useful as Class III antiarrhythmic agents and are stable against rapid metabolism. Methods for treating cardiac arrhythmias with the compounds of Formula I' as well as compositions thereof are also described.