title: Studies on nonpeptide angiotensin II receptor antagonists. III. Synthesis and biological evaluation of 5-alkylidene-3,5-dihydro-4H-imidazol-4-one derivatives.
abstract: 5-Alkylidene-3,5-dihydro-4H-imidazol-4-one derivatives were synthesized and evaluated for activity as angiotensin II receptor antagonists. Substitutions at C-2 and C-5, respectively, with a propyl group and a 1-methylethylidene group resulted in the optimal compound, 3,5-dihydro-5-(1-methylethylidene)-2-propyl-3-[[2'-(1H-tetrazol - 5-yl)biphenyl-4-yl]methyl]-4H-imidazol-4-one (2b), with a pA2 value of 8.85 in rabbit aorta. When administered orally to rats, 2b showed a greater inhibitory effect on angiotensin II-induced pressor response than DuP 753. Compound 2b also showed a good antihypertensive effect when administered orally to conscious sodium-depleted spontaneously hypertensive rats, with a duration of action of 24 h. These data suggest that 2b may be a useful agent for the treatment of angiotensin II-dependent diseases such as hypertension.
authors.affiliation: Institute for Drug Discovery Research, Yamanouchi Pharmaceutical Co., Ltd., Ibaraki, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Okazaki
authors.forename: K
authors.initials: K
authors.lastname: Kikuchi
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: A
authors.initials: A
authors.lastname: Suga
authors.forename: M
authors.initials: M
authors.lastname: Shibasaki
authors.forename: A
authors.initials: A
authors.lastname: Fujimori
authors.forename: O
authors.initials: O
authors.lastname: Inagaki
authors.forename: I
authors.initials: I
authors.lastname: Yanagisawa
mesh_terms: D000804:Angiotensin II / Q000378:metabolism*; D057911:Angiotensin Receptor Antagonists; D000818:Animals; D000959:Antihypertensive Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D001794:Blood Pressure / Q000187:drug effects; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D007093:Imidazoles / Q000138:chemical synthesis* / Q000494:pharmacology; D066298:In Vitro Techniques; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009131:Muscle, Smooth, Vascular / Q000187:drug effects; D011817:Rabbits; D051381:Rats; D011918:Rats, Inbred SHR; D017208:Rats, Wistar; D013329:Structure-Activity Relationship
chemical_list: D057911:Angiotensin Receptor Antagonists; D000959:Antihypertensive Agents; D007093:Imidazoles; D000804:Angiotensin II