Respiratory syncytial virus fusion inhibitors. Part 7: Structure–activity relationships associated with a series of isatin oximes that demonstrate antiviral activity in vivo
作者:Ny Sin、Brian L. Venables、Keith D. Combrink、H. Belgin Gulgeze、Kuo-Long Yu、Rita L. Civiello、Jan Thuring、X. Alan Wang、Zheng Yang、Lisa Zadjura、Anthony Marino、Kathleen F. Kadow、Christopher W. Cianci、Junius Clarke、Eugene V. Genovesi、Ivette Medina、Lucinda Lamb、Mark Krystal、Nicholas A. Meanwell
DOI:10.1016/j.bmcl.2009.06.030
日期:2009.8
A series of bezimidazole-isatin oximes were prepared and profiled as inhibitors of respiratory syncytial virus (RSV) replication in cell culture. Structure-activity relationship studies were directed toward optimization of antiviral activity, cell permeability and metabolic stability in human liver micorosomes (HLM). Parallel combinatorial synthetic chemistry was employed to functionalize isatin oximes via O-alkylation which quickly identified a subset of small, lipophilic substituents that established good potency for the series. Further optimization of the isatin oxime derivatives focused on introduction of nitrogen atoms to the isatin phenyl ring to provide a series of aza-isatin oximes with significantly improved PK properties. Several aza-isatin oximes analogs displayed targeted metabolic stability in HLM and permeability across a confluent monolayer of CaCo-2 cells. These studies identified several compounds, including 18i, 18j and 18n that demonstrated antiviral activity in the BALB/c mouse model of RSV infection following oral dosing. (C) 2009 Elsevier Ltd. All rights reserved.