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。
Microwave‐assisted synthesis of benzo[4,5]imidazo[1,2‐<i>a</i>]pyrimidines and pyrano[4,3‐<i>b</i>]pyrans catalyzed by L‐glutamine functionalized magnetic nanoparticles in water:ethanol mixture
作者:Aiborlang Thongni、Rishanlang Nongkhlaw、Chayan Pandya、Akella Sivaramakrishna、Paige M. Gannon、Werner Kaminsky
DOI:10.1002/jhet.4785
日期:2024.4
one-pot syntheses of benzo[4,5]imidazo[1,2-a]pyrimidine and pyrano[4,3-b]pyran derivatives using L-glutamine functionalized nanoparticles (Fe3O4@SiO2@L-glutamine NPs) undermicrowave irradiation. The organo-nanocatalyst underwent characterization through diverse techniques, including FT-IR, p-XRD, SEM, TEM, EDX, XPS, TGA, and VSM. Microwave irradiation and multicomponent reactions synergistically yield
Preparation and characterization of nano-CaO based on eggshell waste: Novel and green catalytic approach to highly efficient synthesis of pyrano[4,3-b]pyrans
作者:Elaheh Mosaddegh、Asadollah Hassankhani
DOI:10.1016/s1872-2067(12)60755-4
日期:2014.3
Nano-CaO was prepared by calcination of ball-milled chicken eggshell waste. This novel, bioactive, heterogeneous catalyst, which had high catalytic activity and reusability, was used in the green synthesis of pyrano[4,3-b]pyrans via condensation of various aromatic aldehydes, malononitrile, and 4-hydroxy-6-methyl-2H-pyran-2-one at 120 C under solvent-free conditions. The reaction proceeded to completion within 5-45 min in 93%-98% yield. The nano-CaO was fully characterized by scanning electron microscopy, X-ray powder diffraction, infrared spectroscopy, X-ray fluorescence spectroscopy, and thermal gravimetric, surface area, and elemental analyses. (C) 2014, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.