A series of purin-8-ones was prepared and discovered to have excellent bind
ing affintity to the CRH-R1 receptor. Structure-activity studies focused on
amine side-chain optimization, urea substitution and pyridyl isostere inco
rporation. Thus, the highly potent purin-8-ones show promise as a new class
of potential anxiolytics and/or antidepressants. (C) 1999 DuPont Pharmaceu
ticals. Published by Elsevier Science I,td. All rights reserved.