Identification of nicotinamide phosphoribosyltransferase (NAMPT) inhibitors with no evidence of CYP3A4 time-dependent inhibition and improved aqueous solubility
作者:Mark Zak、Bianca M. Liederer、Deepak Sampath、Po-wai Yuen、Kenneth W. Bair、Timm Baumeister、Alexandre J. Buckmelter、Karl H. Clodfelter、Eric Cheng、Lisa Crocker、Bang Fu、Bingsong Han、Guangkun Li、Yen-Ching Ho、Jian Lin、Xiongcai Liu、Justin Ly、Thomas O’Brien、Dominic J. Reynolds、Nicholas Skelton、Chase C. Smith、Suzanne Tay、Weiru Wang、Zhongguo Wang、Yang Xiao、Lei Zhang、Guiling Zhao、Xiaozhang Zheng、Peter S. Dragovich
DOI:10.1016/j.bmcl.2014.12.026
日期:2015.2
Herein we report the optimization efforts to ameliorate the potent CYP3A4 time-dependent inhibition (TDI) and low aqueous solubility exhibited by a previously identified lead compound from our NAMPT inhibitor program (1, GNE-617). Metabolite identification studies pinpointed the imidazopyridine moiety present in 1 as the likely source of the TDI signal, and replacement with other bicyclic systems was found to reduce or eliminate the TDI finding. A strategy of reducing the number of aromatic rings and/or lowering cLogD(7.4) was then employed to significantly improve aqueous solubility. These efforts culminated in the discovery of 42, a compound with no evidence of TDI, improved aqueous solubility, and robust efficacy in tumor xenograft studies. (C) 2014 Elsevier Ltd. All rights reserved.