In the present paper, a simple, highly efficient, and environmentally friendly protocol was proposed for the Knoevenagel condensation reaction of aromatic aldehydes using Meldrum’s acid (2,2-dimethyl-4,6-dioxo-1,3-dioxane) with bentonite as an available non-toxic mineral catalyst exposed to aqueous media under green conditions. Together with the substitution protocol of electron-donating or -withdrawing groups, all reactions were finalized from 5 to 120 min in water at 90°C. With regard to such reactions, the purification of columns on products was not a requirement. Considering the environmental aspect, use of water as a green solvent, utilization of a reusable catalyst, simple work-up process and steps, as well as rapid reaction times were taken into account as some characteristics of these chemical reactions.
在本文中,我们提出了一种简单、高效且环保的协议,用于在
水相介质下进行芳香醛的Knoevenagel缩合反应。该反应使用Meldrum酸(2,2-二甲基-4,6-二氧杂-1,3-二氧
环己烷)作为可用的非有毒矿物催化剂,并与膨润土相结合。在90°C的
水中,所有反应在5到120分钟内完成,无需对产物进行柱层析纯化。考虑到环境因素,使用
水作为绿色溶剂,利用可重复使用的催化剂,简化了工作过程和步骤,以及快速的反应时间,都是这些
化学反应的一些特点。