Condensation of carbonyl derivatives 2 with active methylene compounds 1 is efficiently achieved, within 3 to 15 minutes under microwave irradiation by a solvent free reaction in the presence of carefully adjusted amounts of piperidine leading to Knoevenagel products 3 in good to excellent yields.
在无溶剂条件下,通过仔细调整
哌啶的用量,并借助微波辐照,3至15分钟内即可有效地实现活性亚甲基化合物1与羰基衍
生物2的缩合反应,生成Knoevenagel产物3,产率良好至极佳。