Studies on Nonpeptide Angiotensin II Receptor Antagonists. I. Synthesis and Biological Evaluation of Pyrazolo(1,5-b)(1,2,4)triazole Derivatives with Alkyl Substituents.
作者:Toshio OKAZAKI、Akira SUGA、Toshihiro WATANABE、Kazumi KIKUCHI、Hiroyuki KURIHARA、Masayuki SHIBASAKI、Akira FUJIMORI、Osamu INAGAKI、Isao YANAGISAWA
DOI:10.1248/cpb.46.69
日期:——
Alkyl-substituted pyrazolo[1, 5-b][1, 2, 4]triazole derivatives were synthesized and evaluated for activity as angiotensin II receptor antagonists. Molecules with the (methylbiphenyly)tetrazole moiety at N-5 were the preferred compounds. Ethyl substitutions a both C-2 and C-7 resulted in the optimal compound, 2, 7-diethyl-5-[[2'-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl]-5H-pyrazolo[1, 5-b][1, 2, 4]triazole (5n), with a pA2 value of 8.74 in rabbit aorta. In the in vivo tests, 5n inhibited the angiotensin II-induced pressor response in rats after oral administration. This compound also produced a dose-dependent decrease in blood pressure when administered orally to conscious furosemide-treated dogs, having a longer duration of action as compared to DuP 753. These data suggest that 5n may be a useful agent for the treatment of angiotensin II-dependent disease, such as hypertension.
烷基取代的吡唑并[1,5-b][1,2,4]三唑衍生物被合成并评价为血管紧张素II受体拮抗剂的活性。在N-5位具有(甲基联苯基)四唑部分的分子是首选化合物。在C-2和C-7位同时进行乙基取代得到了最佳化合物,即2,7-二乙基-5-[[2'-(1H-四唑-5-基)联苯基-4-基]甲基]-5H-吡唑并[1,5-b][1,2,4]三唑(5n),其在兔主动脉中的pA2值为8.74。在体内试验中,5n口服给药后抑制了大鼠的血管紧张素II引起的加压反应。该化合物在口服给药时对清醒的呋塞米处理过的狗产生了剂量依赖性的血压下降,并且与DuP 753相比作用时间更长。这些数据表明,5n可能是一种对治疗依赖于血管紧张素II的疾病,如高血压有用的药物。