Y. Kohara et al., A NEW CLASS OF ANGIOTENSIN-II RECEPTOR ANTAGONISTS WITH A NOVEL ACIDIC BIOISOSTERE, Bioorganic & medicinal chemistry letters, 5(17), 1995, pp. 1903-1908
The synthesis and angiotensin II (AII) antagonistic activity of 2-subs
tituted benzimidazole-7-carboxylic acids (8) bearing a novel acidic bi
oisostere, a 5-oxo-1,2,4-oxadiazole ring, are described. These compoun
ds had in vitro and in vivo AII receptor antagonistic activity compara
ble to that of tetrazole analogs. The representative compound, TAK-536
(8 e) is a potent, orally active and specific AII receptor antagonist
.