[bpy]Cl·AlCl3, N=0.67 ionic liquids were found to work well as the Lewis acid catalyst and solvent in the Knoevenagel condensations of benzaldehyde and substituted benzaldehydes with diethyl malonate to give benzylidene malonates. The benzylidene malonates subsequently underwent Michael additions with diethyl malonate. The extent of Michael product formed during the reaction was found to vary with the Lewis acidity
1-丁基-3-甲基
咪唑鎓
氯铝酸盐,[bmim] Cl·AlCl 3,N = 0.67和1-丁基
吡啶鎓
氯铝酸盐,[bpy] Cl·AlCl 3,N发现= 0.67
离子液体在
苯甲醛和取代的
苯甲醛与
丙二酸二乙酯的Knoevenagel缩合反应中作为
路易斯酸催化剂和溶剂很好地工作,得到
亚苄基丙二酸酯。
亚苄基丙二酸酯随后与
丙二酸二乙酯进行迈克尔加成。发现反应过程中迈克尔产物的形成程度随
路易斯酸度和
离子液体的摩尔比而变化。证明了
离子液体的
路易斯酸度对Knoevenagel和Michael产品的影响。在2-羟基芳基醛的情况下,该反应导致在环境条件下形成3-乙氧基羰基
香豆素。