A series of N-substituted 4-amino-2,2-diphenylbutyramide derivatives w
as prepared as part of a search for subtype-selective antimuscarinic a
gents. The representative compound KRP-197, bearing a 2-methylimidazol
= rings as a surrogate of aliphatic amine, was found to be a highly po
tent and both MI- and M?-selective antimuscarinic agent. (C) 1998 Else
vier Science Ltd. All rights reserved.