Add time:08/13/2019         Source:sciencedirect.com

Cyclin G-associated kinase (GAK) is a cellular regulator of the clathrin-associated host adaptor proteins AP-1 and AP-2, which regulates intracellular trafficking of dengue virus during early and late stages of the viral lifecycle. Previously, the discovery of isothiazolo[4,3-b]pyridines as potent and selective GAK inhibitors with promising antiviral activity was reported. In this manuscript, the synthesis of isothiazolo[4,3-b]pyridines with a carbon-linked substituent at position 3 is described by the application of regioselective Suzuki and Sonogashira coupling reactions. A derivative with a 3,4-dimethoxyphenyl residue at position 3 demonstrates low nanomolar binding affinity for GAK and antiviral activity against dengue virus. These findings reveal that appropriate substitution of a phenyl moiety at position 3 of the scaffold can improve GAK binding affinity.

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