A green protocol has been developed for the synthesis of simple coumarins and linear pyrano[2,3-f] and [3,2-f]indoles by the reaction of phenol derivatives with β-ketoesters under ball milling at ambient temperature in the presence of methanesulfonic acid as a mild acid catalyst. The significant advantages of this procedure are high yields, scalability, no use of hazardous acids or solvents, shorter
已开发出一种绿色方案,用于通过
苯酚衍
生物与 β-
酮酯在环境温度下球磨下的反应,合成简单的
香豆素和线性
吡喃并[2,3- f ] 和 [3,2 - f ]
吲哚。
甲磺酸作为温和的酸催化剂。该方法的显着优势是高产率、可扩展性、不使用有害酸或溶剂、反应时间短、环境温度低、成本低以及无需柱色谱即可直接纯化。此过程与高 EcoScale 指标和低E因子相关联。与传统的 Pechmann 缩合过程相比,机械
化学方案可合成具有优异区域选择性和高产率的
吡喃
吲哚。