Endothelin-1 is a potent vasoconstrictor that is thought to be involve
d in many human disease states. We have developed a series of indole n
on-peptide endothelin antagonists including PD 159110 (31), an ET(A) s
elective antagonist, and PD 159020 (37), a non-selective ET(A)/ET(B) a
ntagonist. The discovery, synthesis, and structure-activity relationsh
ips of this series of compounds are described. (C) 1996 Elsevier Scien
ce Ltd.