Zirconium Catalyzed Chemoselective Synthesis of New Amido-Substituted Benzo[b]furans via a One-Pot Reaction
摘要:
A one-pot, three-component reaction of arylglyoxals, benzamide and phenols using catalytic amounts of zirconium oxychloride octahydrate under solvent-free conditions produce new amido-substituted benzo[b]furans. The reactions showed chemoselectivity towards benzofuran instead of oxazols which this claim has been confirmed by nuclear magnetic resonance (NMR) and infrared spectroscopy (IR).
A new, convenient, and environmentally benign three-component synthesis of a novel class of benzofurans is developed by condensing different arylglyoxals, benzamide, and phenolic substrates under solvent-free conditions. These reactions are catalyzed by tungstate sulfuricacid (TSA) as a safe, clean, and recyclable solid acid. The method is operationally simple and provides access to a variety of 2-aryl-3-benzamido