Nonsteroidal cardiotonics. 1. 2-Pyridyl-6,7-dihydro-3H,5H-pyrrolo[2,3-f]benzimidazol-6-ones, a novel class of cardiotonic agents
摘要:
A series of substituted 2-pyridyl-6,7-dihydro-3H,5H-pyrrolo[2,3-f]benzimidazol-6-ones 1-24 were synthesized and evaluated for positive inotropic activity. In rats, cats, and dogs most of these tricyclic heterocycles produced a dose-related increase in myocardial contractility with little effect on heart rate and blood pressure. The increase in contractility was not mediated via stimulation of beta-adrenergic receptors. Compound 1 (BM 14.478) was more potent than milrinone (25) and enoximone when administered intravenously to rats, cats, and dogs. After oral administration of 1 mg/kg, compound 1, milrinone, and pimobendan were equipotent. However, only 1 and pimobendan were still active after 6 h. The structural requirements necessary for optimal cardiotonic activity within this novel class of heterocycles were investigated.
硝基芳烃与带有离去基团和吸电子基团的仲和叔碳负离子的反应:二氢萘[ 2,1- c ]异恶唑N-氧化物和二氢异恶唑[4,3- f ]喹啉N-氧化物的方法
摘要:
2-硝基萘(1)和6-硝基喹啉(2)与衍生自带有离去基团和吸电子基团的亚甲基和次甲基的仲和叔碳负离子(例如,氯乙酸甲酯,氯乙酸乙酯,氯乙腈,甲基在低温下在氢化钠/ N,N-二甲基甲酰胺体系中的2-氯丙酸酯,2-氯丙酸酯和2-氯丙腈)制得相应的二氢萘[ 2,1- c ]异恶唑N-氧化物3和二氢异异恶唑[4] ,3- f ]喹啉N-氧化物4。另一方面,硝基芳烃1和2与氢化钠/四氢呋喃系统中的仲碳负离子反应,生成相应的常规替代性亲核取代(VNS)产物5和6。