A novel three-component reaction of a secondary amine and a 2-hydroxybenzaldehyde derivative with an isocyanide in the presence of silica gel: an efficient one-pot synthesis of benzo[b]furan derivatives
Reaction of an isocyanide with an iminium ion intermediate, formed by reaction between an electron-poor 2-hydroxybenzaldehyde derivative and a secondary amine in the presence of silica gel proceeds smoothly at room temperature to afford benzo[b]furan derivatives in high yields.
由贫电子的2-羟基苯甲醛衍生物与仲胺在硅胶存在下反应形成的异氰化物与亚胺离子中间体的反应在室温下平稳进行,以高收率得到苯并[ b ]呋喃衍生物。