3-(1,1-dioxo-2H-(1,2,4)-benzothiadiazin-3-yl)-4-hydroxy-2(1H)-quinolinones, potent inhibitors of hepatitis C virus RNA-dependent RNA polymerase.
Tedesco, R., Shaw, A.N., Bambal, R., Chai, D., Concha, N.O., Darcy, M.G., Dhanak, D., Fitch, D.M., Gates, A., Gerhardt, W.G., Halegoua, D.L., Han, C., Hofmann, G.A., Johnston, V.K., Kaura, A.C., Liu, N., Keenan, R.M., Lin-Goerke, J., Sarisky, R.T., Wiggall, K.J., Zimmerman, M.N., Duffy, K.J.(2006) J Med Chem 49: 971-983
- PubMed: 16451063 
- DOI: https://doi.org/10.1021/jm050855s
- Primary Citation of Related Structures:  
2FVC - PubMed Abstract: 
Recently, we disclosed a new class of HCV polymerase inhibitors discovered through high-throughput screening (HTS) of the GlaxoSmithKline proprietary compound collection. This interesting class of 3-(1,1-dioxo-2H-1,2,4-benzothiadiazin-3-yl)-4-hydroxy-2(1H)-quinolinones potently inhibits HCV polymerase enzymatic activity and inhibits the ability of the subgenomic HCV replicon to replicate in Huh-7 cells. This report will focus on the structure-activity relationships (SAR) of substituents on the quinolinone ring, culminating in the discovery of 1-(2-cyclopropylethyl)-3-(1,1-dioxo-2H-1,2,4-benzothiadiazin-3-yl)-6-fluoro-4-hydroxy-2(1H)-quinolinone (130), an inhibitor with excellent potency in biochemical and cellular assays possessing attractive molecular properties for advancement as a clinical candidate. The potential for development and safety assessment profile of compound 130 will also be discussed.
Organizational Affiliation: 
Department of Medicinal Chemistry and Drug Metabolism, the Musculoskeletal, Microbial and Proliferative Diseases Center of Excellence for Drug Discovery, GlaxoSmithKline Pharmaceuticals, Collegeville, PA 19426, USA. Rosanna_2_Tedesco@gsk.com