210988-78-6Relevant articles and documents
Studies on nonpeptide angiotensin II receptor antagonists. IV. Synthesis and biological evaluation of 4-acrylamide-1H-imidazole derivatives
Okazaki, Toshio,Watanabe, Toshihiro,Kikuchi, Kazumi,Suga, Akira,Shibasaki, Masayuki,Fujimori, Akira,Inagaki, Osamu,Yanagisawa, Isao
, p. 973 - 981 (2007/10/03)
A novel series of nonpeptide angiotensin II antagonists containing the acrylamide group at the 4-position of the imidazole ring was synthesized and their antagonistic activity was examined by functional assay in rabbit aorta. The acrylamide group was selected as a large lipophilic surrogate for the chloro group of EXP3174. A structure-activity relationship study of the acrylamide moiety has shown that substitution at the 4-position with the N- methyl-3,3-dimethylacrylamide group resulted in the optimal compound, 2- butyl-4-[(3,3-dimethylacryloyl)methyl-amino]-1-[[2'-(1H-tetrazol-5- yl)biphenyl-4-yl]methyl]-1H-imidazole-5-carboxylic acid (1), which was superior to EXP3174 in vitro. Since 1 showed only poor activity against angiotensin II-induced pressor response in rats after oral administration, the carboxylic acid function of 1 was converted into prodrug esters (13). Among these, the 1-[(ethoxycarbonyl)oxy]ethyl ester (13a) showed the most potent and longest-lasting activity when given orally to rats. When administered orally to conscious furosemide-treated dogs, 13a showed an approximately 3-fold increased hypotensive activity in comparison with DuP 753. These data suggest that 13a may be an useful agent for the treatment of angiotensin II-dependent diseases, such as hypertension.