Studies on cardiotonic agents. VII. Potent cardiotonic agent KF15232 with myofibrillar Ca2+ sensitizing effect.
作者:Yuji NOMOTO、Haruki TAKAI、Tetsuji OHNO、Kazuhiro KUBO
DOI:10.1248/cpb.39.900
日期:——
A series of novel 4, 5-dihydro-5-methyl-6-(2 or 4-substituted 7-quinazolinyl)-3(2H)-pyridazinones was synthesized and examined for cardiotonic activity in anesthetized dogs. The 4-substituted aminoquinazolines generally showed potent and long-lasting inotropic activity. Fall in the activity was observed on the introduction of substituent at the 2-position of the quinazoline ring. The 3-substituted 4 (3H)-quinazolinimines generally exhibited weak activity. Ca+2 sensitizing effect of the 4-substituted amino derivatives was also examined in chemically skinned fiber from papillary muscle of guinea pig. The alkylamino derivatives exhibited small sensitizing effect, while the benzylamino derivatives exhibited large effect. Among them, KF15232 (Ix) was found to have the most potent cardiotonic and Ca2+ sensitizing activities.
一系列新型的4,5-二氢-5-甲基-6-(2或4-取代的7-喹唑啉基)-3(2H)-哒嗪酮被合成并在麻醉犬中检测其强心活性。4-取代的氨基喹唑啉通常显示出强力且持久的正性肌力活性。当在喹唑啉环的2-位引入取代基时,活性下降。3-取代的4(3H)-喹唑啉亚胺通常显示出较弱的活性。4-取代氨基衍生物的钙离子增敏效应也在来自豚鼠乳头肌的化学剥离纤维中进行了研究。烷基氨基衍生物显示出小的增敏效应,而苄基氨基衍生物显示出较大的效应。其中,KF15232 (Ix) 被发现具有最强大的强心和钙离子增敏活性。