Journal of Medicinal Chemistry p. 5129 - 5140 (2014)
Update date:2022-07-30
Topics:
Rooney, Lisa
Vidal, Agnès
D'Souza, Anne-Marie
Devereux, Nick
Masick, Brian
Boissel, Valerie
West, Ryan
Head, Victoria
Stringer, Rowan
Lao, Jianmin
Petrus, Matt J.
Patapoutian, Ardem
Nash, Mark
Stoakley, Natalie
Panesar, Moh
Verkuyl, J. Martin
Schumacher, Andrew M.
Petrassi, H. Michael
Tully, David C.
A high throughput screening campaign identified 5-(2-chlorophenyl)indazole compound 4 as an antagonist of the transient receptor potential A1 (TRPA1) ion channel with IC50 = 1.23 μM. Hit to lead medicinal chemistry optimization established the SAR around the indazole ring system, demonstrating that a trifluoromethyl group at the 2-position of the phenyl ring in combination with various substituents at the 6-position of the indazole ring greatly contributed to improvements in vitro activity. Further lead optimization resulted in the identification of compound 31, a potent and selective antagonist of TRPA1 in vitro (IC50 = 0.015 μM), which has moderate oral bioavailability in rodents and demonstrates robust activity in vivo in several rodent models of inflammatory pain.
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