Crystal structure and biological activity of tetra-tosyl derivative of quercetin

Abstract

At present time one of the great interest is represented on the biologic activities of quercetin a polyphenol relating to the class of flavonoids, natural products generally known for their beneficial actions on health. With the aim of obtaining new derivatives of quercetin which would possess a potential of showing valuable biological activity, 5-hydroxy-3,3’,4’,7-tetratosyl flavone was synthesized by base catalyzed etherification of the starting material with 4-toluenesulfonyl chloride (TsCl). The chemical structure of the derived molecule was established by X-ray crystallographic analysis. The 1 H and 13 C NMR spectra of this compound were interpreted using 2D NMR spectroscopy. The new synthesized compound was tested for cytotoxic and antiradical activities and its other possible pharmacological properties were predicted using PASS software.