A solvent‐free and synthetic pathway to novel benzofuran derivatives, starting from oxidation of phenyl ketones to arylglyoxals in three steps was developed. The molybdatesulfuricacidcatalyzed the reaction of arylglyoxals with benzamide and phenols to afford 2‐aryl‐3‐benzamidobenzofurans in high yield. The structures of the synthesized compounds were assigned on the basis of elemental analysis,
从苯酮氧化为芳基乙二醛的三步反应开始,开发了一种无溶剂的合成新型苯并呋喃衍生物的途径。钼酸硫酸催化芳基乙二醛与苯甲酰胺和苯酚的反应,以高收率提供2-芳基-3-苯甲酰胺基苯并呋喃。根据元素分析,IR,1 H NMR和13 C NMR光谱数据指定合成的化合物的结构。本方法具有许多优点,例如无危险的反应条件,简单的操作和后处理程序。
Synthesis of a novel class of benzofurans via a three-component, regiospecific intramolecular heterocylization reaction
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
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).