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Zheng, Xiaozhang; Bauer, Paul; Baumeister, Timm; Buckmelter, Alexandre J; Caligiuri, Maureen; Clodfelter, Karl H; Han, Bingsong; Ho, Yen-Ching; Kley, Nikolai; Lin, Jian; Reynolds, Dominic J; Sharma, Geeta; Smith, Chase C; Wang, Zhongguo; Dragovich, Peter S; Gunzner-Toste, Janet; Liederer, Bianca M; Ly, Justin; O’Brien, Thomas; Oh, Angela; Wang, Leslie; Wang, Weiru; Xiao, Yang; Zak, Mark; Zhao, Guiling; Yuen, Po-wai; Bair, Kenneth W
Journal of medicinal chemistry, 08/2013, Volume: 56, Issue: 16Journal Article
Crystal structures of several urea- and thiourea-derived compounds in complex with the nicotinamide phosphoribosyltransferase (Nampt) protein were utilized to design a potent amide-containing inhibitor bearing an aza-indole moiety (7, Nampt BC IC50 = 9.0 nM, A2780 cell proliferation IC50 = 10 nM). The Nampt–7 cocrystal structure was subsequently obtained and enabled the design of additional amide-containing inhibitors which incorporated various other fused 6,5-heterocyclic moieties and biaryl sulfone or sulfonamide motifs. Additional modifications of these molecules afforded many potent biaryl sulfone-containing Nampt inhibitors which also exhibited favorable in vitro ADME properties (microsomal and hepatocyte stability, MDCK permeability, plasma protein binding). An optimized compound (58) was a potent inhibitor of multiple cancer cell lines (IC50 <10 nM vs U251, HT1080, PC3, MiaPaCa2, and HCT116 lines), displayed acceptable mouse PK properties (F = 41%, CL = 52.4 mL/min/kg), and exhibited robust efficacy in a U251 mouse xenograft model.
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