Acyl CoA:Cholesterol Acyltransferase (ACAT) Inhibitors: Synthesis and Structure-Activity Relationship Studies of a New Series of Trisubstituted Imidazoles

Abstract
A series of 4,5-diaryl-2-(substituted thio)-1H-imidazoles has been synthesized and demonstrated to be potent inhibitors of acyl-CoA:cholesterol acyltransferase (ACAT). The design, synthesis, and structure-activity relationships for this series are reported herein. One of the compounds from this series, N'-(2,4-difluorophenyl)-N-[5-[(4,5-diaryl-1H-imidazol-2- yl)thio]pentyl]-N-heptylurea (DuP 128), was selected for development as an intestinally active ACAT inhibitor. DuP 128 is a potent ACAT inhibitor in vitro and in vivo, inhibiting ACAT in rat hepatic microsomes with an IC50 = 10 nM and possessing potent antihypercholesterolemic activity in vivo.

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