Quinoline-, 1,5-naphthyridine- and pyridine-based angiotensin II antag
onists are reported. The more potent compounds gave IC50 values of ca
0.01 muM in a guinea pig adrenal membrane binding assay and intravenou
s ED50 values in the range 0.1-1.0 mg/kg for inhibition of the AII-ind
uced pressor response in normotensive rats. Several of these compounds
, for example 4d (ICI D6888), showed good oral activity in this animal
model.