冠醚络合阳离子液体(CECILs),对4,5-二氢吡喃并[3,2- c ]亚甲基和4,5-二氢吡喃并[4,3- b ]吡喃的三组分合成具有环境友好性
摘要:
冠醚络合物阳离子离子液体(CECIL)在EtOH中回流下催化芳香醛,丙二腈和4-羟基香豆素或4-羟基-6-甲基吡喃酮的三组分反应,合成4,5-二氢吡喃[3,2] - c ^ ]色和4,5-二氢吡喃并[4,3- b ]吡喃衍生物。CECIL是对环境无害,易于获得的稳定催化剂。高转化率,较短的反应时间和更清洁的反应曲线是该方法的一些优势。
Sodium ethylene diamine tetraacetate catalyzed synthesis of chromene derivatives via multi-component reactions at low catalyst loading
作者:Lu Chen、Jiaqi Lin、Bin Chen、Liqin Zhao
DOI:10.1007/s11164-017-3015-3
日期:2017.11
An efficient and practical protocol for the synthesis of chromenes derivatives catalyzed by a low-loading sodium ethylene diamine tetraacetate (2 mol%) as a catalyst via multicomponent reaction is reported. A wide range of aromatic aldehydes easily undergo condensations with malononitrile and 4-hydroxycoumarin (4-hydroxy-6-methyl-2-pyrone or dimedone) under mild conditions to afford the desired products
In this work we describe a simple and rapid method for the synthesis of a series of pyrano[4,3-b]pyranderivatives by a three-component reaction between 4‑hydroxy-6-methylpyran-2-one, malononitrile and a variety of aromatic and heteroaromatic aldehydes. The reactions are carried out at reflux of a water/ethanol mixture in the presence of 10 mol% of pyridinium p-toluenesulfonate as catalyst with excellent