Studies on Nonpeptide Angiotensin II Receptor Antagonists. II. Synthesis and Biological Evaluation of 5H-Pyrazolo(1,5-b)(1,2,4)triazole Derivatives with a C-Linked Oxygen Functional Group at the 6-Position.
作者:Toshio OKAZAKI、Akira SUGA、Toshihiro WATANABE、Kazumi KIKUCHI、Hiroyuki KURIHARA、Masayuki SHIBASAKI、Akira FUJIMORI、Osamu INAGAKI、Isao YANAGISAWA
DOI:10.1248/cpb.46.287
日期:——
2,7-Diethyl-5H-pyrazolo[1,5-b][1,2,4]triazole derivatives were synthesized and evaluated for activity as angiotensin II receptor antagonists. Replacement of the C-6 hydrogen with C-linked oxygen functional groups led to derivatives with increased in vitro activities. Among these compounds, 2,7-diethyl-5-[[2'-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl]-5H- pyrazolo[1,5-b][1,2,4]triazole-6-carboxylic acid
合成了2,7-二乙基-5H-吡唑并[1,5-b] [1,2,4]三唑衍生物,并评估了其作为血管紧张素II受体拮抗剂的活性。用C-连接的氧官能团取代C-6氢导致衍生物具有增加的体外活性。在这些化合物中,2,7-二乙基-5-[[2'-(1H-四唑-5-基)联苯-4-基]甲基] -5H-吡唑并[1,5-b] [1,2, 4]三唑-6-羧酸(2d)具有强效,无法克服的拮抗作用,但对大鼠血管紧张素II引起的升压反应的口服药效较差。为了提高口服活性,将2d的羧酸官能团转化为双酯。该修饰得到(+/-)-1-[((乙氧羰基)氧基]乙基] 2,7-二乙基-5-[[2'-(1H-四唑-5-基)联苯-4-基]甲基] -5H -在大鼠中具有口服活性的吡唑并[1,5-b] [1,2,4]-三唑-6-羧酸盐(2f),当对有意识的呋塞米治疗的狗口服给药时,血压会产生剂量依赖性的血压降低。与母体C-6氢化合物相比,效价提高了3倍。