Structure−Activity Relationships of Substituted 1-Pyridyl-2-phenyl-1,2-ethanediones: Potent, Selective Carboxylesterase Inhibitors
作者:Brandon M. Young、Janice L. Hyatt、David C. Bouck、Taosheng Chen、Parimala Hanumesh、Jeanine Price、Vincent A. Boyd、Philip M. Potter、Thomas R. Webb
DOI:10.1021/jm101101q
日期:2010.12.23
Inhibition of intestinal carboxylesterases may allow modification of the pharmacokinetics/pharmacodynamic profile of existing drugs by altering half-life or toxicity. Since previously identified diarylethane-1,2-dione inhibitors are decidedly hydrophobic, a modified dione scaffold was designed and elaborated into a > 300 member library, which was subsequently screened to establish the SAR for esterase inhibition. This allowed the identification of single digit nanomolar hiCE inhibitors that showed improvement in selectivity and measured solubility.
An environmentally benign and atom-economical process to construct a unique quinoline-based tetracyclic scaffold, through sequential hydration-condensation-double cyclization reactions, has been described. The reaction starts with readily available pyridine-substituted o-alkynylanilines and β-keto esters, promoted by p-toluenesulfonic acid in ethanol in one pot. In the absence of β-keto esters, multisubstituted quinolines are formed bimolecularly in reasonable yields.