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Zirconium catalyzed synthesis of 2-arylidene Indan-1,3-diones and evaluation of their inhibitory activity against NS2B-NS3 WNV protease.
European Journal of Medicinal Chemistry 2018 April 11
A simple and efficient Knoevenagel procedure for the synthesis of 2-arylidene indan-1,3-diones is herein reported. These compounds were prepared via ZrOCl2·8H2O catalyzed reactions of indan-1,3-dione with several aromatic aldehydes and using water as the solvent. The 2-arylidene indan-1,3-diones were obtained with 53%-95% yield within 10-45 min. The synthesized compounds were evaluated as inhibitors of the NS2B-NS3 protease of West Nile Virus (WNV). It was found that hydroxylated derivatives impaired enzyme activity with varying degrees of effectiveness. The most active hydroxylated derivatives, namely 2-(4-hydroxybenzylidene)-1H-indene-1,3(2H)-dione (14) and 2-(3,4-dihydroxybenzylidene)-1H-indene-1,3(2H)-dione (17), were characterized as noncompetitive enzymes inhibitors, with IC50 values of 11 μmol L-1 and 3 μmol L-1 , respectively. Docking and electrostatic potential surfaces investigations provided insight on the possible binding mode of the most active compounds within an allosteric site.
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