Fragment-Based, Structure-Enabled Discovery of Novel Pyridones and Pyridone Macrocycles as Potent Bromodomain and Extra-Terminal Domain (BET) Family Bromodomain Inhibitors

Members of the BET family of bromodomain containing proteins have been identified as potential targets for blocking proliferation in a variety of cancer cell lines. A two-dimensional NMR fragment screen for binders to the bromodomains of BRD4 identified a phenylpyridazinone fragment with a weak bin...

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Published in:	Journal of medicinal chemistry 2017-05, Vol.60 (9), p.3828-3850
Main Authors:	Wang, Le, Pratt, John K, Soltwedel, Todd, Sheppard, George S, Fidanze, Steven D, Liu, Dachun, Hasvold, Lisa A, Mantei, Robert A, Holms, James H, McClellan, William J, Wendt, Michael D, Wada, Carol, Frey, Robin, Hansen, T. Matthew, Hubbard, Robert, Park, Chang H, Li, Leiming, Magoc, Terrance J, Albert, Daniel H, Lin, Xiaoyu, Warder, Scott E, Kovar, Peter, Huang, Xiaoli, Wilcox, Denise, Wang, Rongqi, Rajaraman, Ganesh, Petros, Andrew M, Hutchins, Charles W, Panchal, Sanjay C, Sun, Chaohong, Elmore, Steven W, Shen, Yu, Kati, Warren M, McDaniel, Keith F
Format:	Article
Language:	eng
Subjects:	60 APPLIED LIFE SCIENCES Animals Crystallography, X-Ray Drug Discovery INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY Macrocyclic Compounds - chemistry Macrocyclic Compounds - pharmacokinetics Macrocyclic Compounds - pharmacology Molecular Structure Pyridones - chemistry Pyridones - pharmacokinetics Pyridones - pharmacology Rats Structure-Activity Relationship
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Summary:	Members of the BET family of bromodomain containing proteins have been identified as potential targets for blocking proliferation in a variety of cancer cell lines. A two-dimensional NMR fragment screen for binders to the bromodomains of BRD4 identified a phenylpyridazinone fragment with a weak binding affinity (1, K i = 160 μM). SAR investigation of fragment 1, aided by X-ray structure-based design, enabled the synthesis of potent pyridone and macrocyclic pyridone inhibitors exhibiting single digit nanomolar potency in both biochemical and cell based assays. Advanced analogs in these series exhibited high oral exposures in rodent PK studies and demonstrated significant tumor growth inhibition efficacy in mouse flank xenograft models.
ISSN:	0022-2623 1520-4804