Journal of Medicinal Chemistry p. 3371 - 3380 (1993)
Update date:2022-08-02
Topics:
Bernhart, Claude A.
Perreaut, Pierre M.
Ferrari, Bernard P.
Muneaux, Yvette A.
Assens, Jean-Louis A.
et al.
Starting from the structure of the novel nonpeptide AT1 receptor antagonists DuP 753 (losartan), a new series of potent antagonists was designed.In these compounds the central imidazole nucleus was replaced by the dihydroimidazol-4-one structure.The most active compounds had a spirocyclopentane or a spirocyclohexane ring in position 5.Like the imidazole series, the best substituents were the linear butyl chain in position 2 and the <2'-(tetrazol-5-yl)biphenylyl>methyl group in position 3.Antagonistic activity was assessed by the ability of the compounds to competively inhibit <125I>AII binding to the AT1 subtype receptor and to antagonize AII-induced contractions in rabbit aorta rings.The most active compounds had IC50 values in the nanomolar range.In conscious rats, compounds 4 and 21 antagonized the AII pressor response when administered orally.Compound 21 (SR 47436) was the most active; it was recently shown to also be active in cynomolgus monkeys both intravenously and orally.This molecule is now undergoing clinical trials for the treatment of hypertension.
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