Nickel nanoparticles catalyzed chemoselective Knoevenagel condensation of Meldrum’s acid and tandem enol lactonizations via cascade cyclization sequence
作者:Jitender M. Khurana、Kanika Vij
DOI:10.1016/j.tetlet.2011.05.032
日期:2011.7
A novel protocol has been reported wherein, polyethylene glycol (PEG) stabilized nickel nanoparticles have been used as catalyst for chemoselective Knoevenagel condensation of aromatic aldehydes and Meldrum’s acid to give 5-arylidene Meldrum’s acid which underwent tandem enol lactonization by Michael addition/cyclization sequence with active methylene compounds in the presence of Ni nanoparticles to
据报导了一种新的方案,其中,用聚乙二醇(PEG)稳定的镍纳米颗粒作为催化剂,用于芳香醛和Meldrum's酸的化学选择性Knoevenagel缩合反应,生成5芳基的Meldrum's酸,并通过Michael加成/环化顺序进行了串联烯醇内酯化。 Ni纳米颗粒的存在下,该活性亚甲基化合物得到相应的烯醇内酯衍生物。