5-Hydroxyindoles are found in nature and display a wide variety of biological activities [1, 2]. A series of polysubstituted 5-hydroxyindole-based agents have been developed recently including the antiviral and immunomodulatory drug arbidol, ethyl 6-bromo-4- dimethylaminomethyl-5-hydroxy-1-methyl-2-phenylthio-methylindole-3-carboxylate hydrochloride [3](and its 4-substituted derivatives [4]), as well as compounds of potential ...
