Factor Xa (FXa) is well known to play a pivotal role in blood coagulation, so FXa inhibitor is a promising drug candidate for prophylaxis and treatment of thromboembolic diseases. In the course of our research, we have found that (R)-5-[1-(acetimidoyl)piperidin-4-yloxy]-2-(7-amidinonaphthalen-2-yl)-1-(ethanesulfonyl)indoline ((R)-1) showed potent FXa inhibitory activity in vitro. However, single oral administation (RS)-1 showed high toxicity in mice. Among newly synthesized compounds, ((RS)-5-[1-(acetimidoyl)piperidin-4-yloxy]-2-(7-amidinonaphthalen-2-yl)indolin-1-yl}sulfonyl)acetic acid ((RS)-11d) showed more potent FXa inhibitory activity and higher safety than (RS)-1. The R-isoform of compound 11d ((R)-11d) exhibited potent in vitro anticoagulant activity in human and hamster plasma. Orally administered (R)-11d also showed dose-dependent potent anticoagulant activity in hamsters, marmosets and cynomolgus monkeys. Compound (R)-11d with potent anticoagulant activity and high safety is therefore favorable as a novel oral FXa inhibitor.
因子Xa(FXa)在血液凝固中发挥着重要作用,因此FXa
抑制剂是预防和治疗血栓栓塞性疾病的有前景的药物候选者。在我们的研究中,我们发现(R)-5-[1-(乙
酰亚胺基)piperidin-4-yloxy]-2-(7-
氨基
萘-2-基)-1-(
乙烷磺酰基)
吲哚((R)-1)在体外展示了强效的FXa抑制活性。然而,单次口服给药的(RS)-1在小鼠中显示出高毒性。在新合成的化合物中,((RS)-5-[1-(乙
酰亚胺基)piperidin-4-yloxy]-2-(7-
氨基
萘-2-基)
吲哚-1-基}磺酰基)
乙酸((RS)-11d)显示出比(RS)-1更强的FXa抑制活性和更高的安全性。化合物11d的R-异构体((R)-11d)在人的和仓鼠的血浆中表现出强效的体外抗凝活性。口服给药的(R)-11d在仓鼠、狨猴和恒河猴中也显示出剂量依赖的强效抗凝活性。因此,具有强抗凝活性和高安全性的化合物(R)-11d是作为一种新型口服FXa
抑制剂的有利选择。