Discovery, Optimization, and in Vivo Evaluation of Benzimidazole Derivatives AM-8508 and AM-9635 as Potent and Selective PI3Kδ Inhibitors
作者:Youngsook Shin、Julia Suchomel、Mario Cardozo、Jason Duquette、Xiao He、Kirk Henne、Yi-Ling Hu、Ron C. Kelly、John McCarter、Lawrence R. McGee、Julio C. Medina、Daniela Metz、Tisha San Miguel、Deanna Mohn、Thuy Tran、Christine Vissinga、Simon Wong、Sharon Wannberg、Douglas A. Whittington、John Whoriskey、Gang Yu、Leeanne Zalameda、Xuxia Zhang、Timothy D. Cushing
DOI:10.1021/acs.jmedchem.5b01651
日期:2016.1.14
Lead optimization efforts resulted in the discovery of two potent, selective, and orally bioavailable PI3K delta inhibitors, 1 (AM-8508) and 2 (AM-9635), with good pharmacokinetic properties. The compounds inhibit B cell receptor (BCR)-mediated AKT phosphorylation (pAKT) in PI3K delta-dependent in vitro cell based assays. These compounds which share a benzimidazole bicycle are effective when administered in vivo at unbound concentrations consistent with their in vitro cell potency as a consequence of improved unbound drug concentration with lower unbound clearance. Furthermore, the compounds demonstrated efficacy in a Keyhole Limpet Hemocyanin (KLH) study in rats, where the blockade of PI3K delta activity by inbibitors 1 and 2 led to effective inhibition of antigen-specific IgG and IgM formation after immunization with KLH.