在本研究中,一种新的低粘度磺酸官能化离子液体(SAIL)即。合成了4,4'-三亚甲基-N,N'-磺酸-二哌啶鎓氯化物,并用FTIR,1D和2D NMR以及质谱进行了表征。然后,确定了新的SAIL的一些特性,包括pH,粘度,密度和在某些常用溶剂中的溶解度。在无溶剂条件下,使用行星式球磨机证明了新SAIL对吡喃并[4,3- b ]吡喃,二氢吡喃并[3,2- c ]色烯和四氢苯并[ b ]吡喃的一锅机械合成具有催化活性。目前用于合成4 H的机械合成方法-吡喃环化的杂环支架结合了常规多组分反应的合成优点,生态效益和简单的机械催化方法的便利性。新的SAIL易于回收利用,可以重复使用多次,而不会造成严重的活动损失。
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
Synthesis of a novel bifunctional oxyammonium‐based ionic liquid: Application for the synthesis of pyrano[4,3‐<i>b</i>]pyrans and tetrahydrobenzo[<i>b</i>]pyrans
作者:Azra Zarei、Meysam Yarie、Mohammad Ali Zolfigol、Khodabakhsh Niknam
DOI:10.1002/jccs.201800468
日期:2020.6
In the present investigation, a novel bifunctional oxyammonium‐based ionic liquid, namely, 2,2′‐(ethane‐1,2‐diylbis[oxy])bis(ethan‐1‐aminium)‐2,2,2‐trifluoroacetate, was designed and synthesized. The structure of the titled ionic liquid was characterized using Fourier‐transform infrared spectroscopy (FT‐IR), protonnuclearmagneticresonance (1HNMR), carbon nuclearmagneticresonance (13CNMR), fluorine
Crown ether complex cation ionic liquids (CECILs) as environmentally benign catalysts for three-component synthesis of 4,5-dihydropyrano[3,2-c]chromene and 4,5-dihydropyrano[4,3-b]pyran derivatives
作者:Mehdi Abaszadeh、Mohammad Seifi
DOI:10.1007/s11164-014-1855-7
日期:2015.10
Crownether complex cation ionic liquids (CECILs) catalyze three-component reaction of aromatic aldehydes, malononitrile, and 4-hydroxycoumarin or 4-hydroxy-6-methylpyrone, in EtOH under reflux, for synthesis of 4,5-dihydropyrano[3,2- c ]chromene and 4,5-dihydropyrano[4,3- b ]pyran derivatives. CECILs are environmentally benign, easily obtained, stable catalysts. High conversion, short reaction times
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。
Efficient synthesis, crystal structure, Hirshfeld surface analysis, biological evaluation, DFT calculations and Docking study of pyrano[4,3-b]pyran derivatives
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