Based on our pharmacophore model of the aryl diketoacids (ADKs), we designed and prepared a series of novel ADK analogues, which showed potent inhibitory activities against the NS5B polymerase in the submicromolar range. Pharmacophore-guided docking study revealed that the antiviral activities of the ADKs are highly dependent upon the aryl linker as well as the size and position of the aromatic substituent. It is of another importance that, unlike previously reported ADKs, three ADK analogues synthesized in this study effectively blocked Hepatitis C Virus (HCV) replication in the replicon systems. (C) 2008 Elsevier Ltd. All rights reserved.
Tetrazole and triazole as bioisosteres of carboxylic acid: Discovery of diketo tetrazoles and diketo triazoles as anti-HCV agents
A series of diketo tetrazoles and diketo triazoles were designed and synthesized as bioisosteres of alpha,gamma-diketo acid, the active site inhibitor of HCV (Hepatitis C virus) polymerase NS5B. Among the synthesized compounds, 4-(4-fluorobenzyloxy)phenyl diketo triazole (30) exhibited anti-HCV activity with an EC50 value of 3.9 mu M and an SI value more than 128. The reduction of viral protein and mRNA levels were also validated, supporting the anti-HCV activity of compound 30. These results provide convincing evidence that the diketo tetrazoles and diketo triazoles can be developed as bioisosteres of alpha,gamma-diketo acid to exhibit potent inhibitory activity against HCV. (c) 2013 Elsevier Ltd. All rights reserved.