Basic Ionic Liquid Promoted Domino Knoevenagel-Thia-Michael Reaction: An Efficient and Multicomponent Strategy for Synthesis of 1,3-Thiazines
作者:I. R. Siddiqui、Rahila、Shayna Shamim、Pragati Rai、Shireen、Malik A. Waseem、Arjita Srivastava、Anjali Srivastava
DOI:10.1002/jhet.2379
日期:2016.7
An efficient, three‐component strategy for synthesis of 1,3‐thiazines with high atom economy in one‐pot mediated by room temperature basic ionic liquid is described here. The strategy involves basic ionic liquid, [bmim]OH‐catalyzed Knoevenagel condensation between ethyl cyanoacetate and aromatic aldehyde and subsequent thia‐Michael addition with substituted thioureas. The reaction sequence is smooth
本文描述了一种高效的三组分策略,该方法在室温碱性离子液体的介导下,在一个锅中合成具有高原子经济性的1,3-噻嗪。该策略涉及碱性离子液体,氰基乙酸乙酯和芳香醛之间的[bmim] OH催化的Knoevenagel缩合反应,以及随后的硫代迈克尔与取代的硫脲的噻吩加成反应。在环境温度下,反应顺序平稳且定量。回收了[bmim] OH,并重复使用了四次,但反应活性和产物收率没有明显下降。