title: 3,8-diazabicyclo--[3.2.1]-octane derivatives as analogues of ambasilide, a Class III antiarrhythmic agent.
abstract: Ambasilide, a representative of Class III antiarrhythmics, was reported to prolong the cardiac action potential duration in the dog, with little or no effect on Ca and Na currents. We synthesised a series of ambasilide analogues, having the 3,8-diazabicyclo-[3.2.1]-octane moiety instead of the 3,7-diazabicyclo-[3.3.1]-nonane present in ambasilide. The compounds were tested both in vitro extracellular electrophysiological assays and by the conventional microelectrode technique. Most of them lengthened the effective refractory period (ERP) with no change or slight increase on the impulse conduction time (ICT). Similarly some of the tested compounds lengthened the action potential duration (APD), a typical Class III feature, without exerting any significant effect on the maximal rate of depolarization, therefore apparently lacking Class I antiarrhythmic activity.
authors.affiliation: Istituto di Chimica Farmaceutica, Universitá di Milano, Viale Abruzzi 42, 20131, Milan, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Villa
authors.forename: D
authors.initials: D
authors.lastname: Barlocco
authors.forename: G
authors.initials: G
authors.lastname: Cignarella
authors.forename: G J
authors.initials: GJ
authors.lastname: Papp
authors.forename: B
authors.initials: B
authors.lastname: Baláti
authors.forename: J
authors.initials: J
authors.lastname: Takács
authors.forename: A
authors.initials: A
authors.lastname: Varró
authors.forename: A
authors.initials: A
authors.lastname: Borosy
authors.forename: K
authors.initials: K
authors.lastname: Keserû
authors.forename: P
authors.initials: P
authors.lastname: Mátyus
mesh_terms: D062365:Aminobenzoates / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D000818:Animals; D000889:Anti-Arrhythmia Agents / Q000138:chemical synthesis* / Q000737:chemistry* / Q000494:pharmacology*; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D004285:Dogs; D015195:Drug Design; D022062:Electrophysiologic Techniques, Cardiac; D005260:Female; D006352:Heart Ventricles / Q000187:drug effects*; D066298:In Vitro Techniques; D008297:Male; D008839:Microelectrodes; D008958:Models, Molecular; D008968:Molecular Conformation; D013329:Structure-Activity Relationship
chemical_list: D062365:Aminobenzoates; D000889:Anti-Arrhythmia Agents; D019086:Bridged Bicyclo Compounds, Heterocyclic; C075113:ambasilide