organocatalyst to afford various electrophilic alkenes in excellent yields (up to 90%). In the presence of a catalytic amount of quinine (15 mol%), the reaction proceeded at room temperature (RT) under solvent-free conditions. In this green approach, the organocatalyst was recovered and recycled for up to four cycles without appreciable loss of activity.
使用
奎宁作为有机催化剂,可以开发出活性亚甲基化合物与芳族羰基化合物之间的Knoevenagel缩合反应,从而以极高的收率(最高90%)提供各种亲电子烯烃。在催化量的
奎宁(15mol%)的存在下,反应在室温(RT)下在无溶剂条件下进行。在这种绿色方法中,有机催化剂被回收并循环使用多达四个周期,而活性没有明显下降。