Evaluation of magnetically recyclable nano-Fe3O4 as a green catalyst for the synthesis of mono- and bis-tetrahydro-4H-chromene and mono and bis 1,4-dihydropyridine derivatives
Ferrocene-Functionalized Dithiocarbamate Zinc(II) Complexes as Efficient Bifunctional Catalysts for the One-Pot Synthesis of Chromene and Imidazopyrimidine Derivatives via Knoevenagel Condensation Reaction
作者:Anamika、Chote Lal Yadav、Michael G. B. Drew、Kamlesh Kumar、Nanhai Singh
DOI:10.1021/acs.inorgchem.1c00162
日期:2021.5.3
analyses, IR, UV–vis, and 1H and 13C1H} NMR spectroscopic techniques. The solid-statestructures of complexes 1, 3, and 4 have been determined by single-crystal X-ray crystallography as well as powder X-ray diffraction. Single-crystal X-ray crystallography revealed a monomeric structure for complex 1 but 1Dpolymericstructures for complexes 3 and 4. In all complexes, dithiocarbamate ligands are bonded
Practical and Green Protocol for the Synthesis of Substituted 4<i>H</i>-Chromenes Using Room Temperature Ionic Liquid Choline Chloride-Urea
作者:C. N. Revanna、T. R. Swaroop、G. M. Raghavendra、D. G. Bhadregowda、K. Mantelingu、K. S. Rangappa
DOI:10.1002/jhet.880
日期:2012.7
An efficient and convenient synthesis of substituted 4H‐chromenes is described usingroomtemperatureionicliquid (RTIL) cholinechloride–urea in one pot under solvent free conditions. Three‐component Knoevenagel condensation of an aromatic aldehyde, with an active methylene compound, and a cyclohexane dione is reported. This new approach has advantage of excellent yields (82–96%), clean reaction
Crown ether complex cation ionic liquids: synthesis and catalytic applications for the synthesis of tetrahydro-4<i>H</i>-chromene and 1,4-dihydropyridine derivatives
作者:Mehdi Abaszadeh、Mohammad Seifi
DOI:10.1080/17415993.2017.1293058
日期:2017.7.4
ABSTRACT A series of crownethercomplex cation ionic liquids (CECILs) are synthesized by crownethers chelated with sodium benzenesulfonates, and used as a green and environmental catalyst, for the synthesis of tetrahydro-4H-chromene and 1,4-dihydropyridine derivatives by three-component reactions of aromatic aldehydes and malononitrile with cyclic β-dicarbonyls or cyclic β-enaminoketones respectively
4-Dialkylaminopyridine modified magnetic nanoparticles: as an efficient nano-organocatalyst for one-pot synthesis of 2-amino-4H-chromene-3-carbonitrile derivatives in water
silica-coated magneticnanoparticles (Fe3O4@SiO2) were reacted with trimethoxy(vinyl)silane. The MNP–DMAP catalyst shows remarkable activity in the synthesis of 2-amino-4H-chromene-3-carbonitrile derivatives using a multicomponent reaction under mild conditions in water as a green solvent. The MNP–DMAP was reusable in this process for at least 10 times without any treatment in its catalytic activity.
通过将4-二烷基氨基吡啶部分固定在Fe 3 O 4磁性纳米颗粒(MNP–DMAP)上,开发了一种新型的异质磁性纳米有机催化剂。它是通过MNP-环氧乙烷(MNPO)与N-甲基吡啶-4-胺的反应合成的。通过使用H 2 O 2氧化乙烯基官能化的MNP(VMNP)表面上的乙烯基来生产MNPO基板。为了合成VMNP,使二氧化硅涂覆的磁性纳米颗粒(Fe 3 O 4 @SiO 2)与三甲氧基(乙烯基)硅烷反应。MNP–DMAP催化剂在2-氨基-4 H的合成中显示出显着的活性-Crene-3-carbontritrile衍生物在温和条件下于水中作为绿色溶剂使用多组分反应。MNP–DMAP在此过程中至少可重复使用10次,而无需对其催化活性进行任何处理。
Sodium Benzenesulfinates: Novel and Effective Organo Catalyst for Three Component Synthesis 5,6,7,8-Tetrahydro-4H-chromene Derivatives Under Ultrasound Irradiation
作者:Mehdi Abaszadeh、Mohammad Seifi
DOI:10.2174/1570178612666150203004727
日期:2015.3.24
Sodium benzenesulfinates, as a new organo catalyst, can be used to synthesize tetrahydro-
4H-chromene derivatives by three component reaction of cyclic β-dicarbonyl compounds, malononitrile,
and aromatic aldehydes, in H2O/EtOH, under ultrasound irradiation at room temperature. Inexpensiveness,
stability and the potential of being easily obtained can be noted as preponderance of
these catalysts. Furthermore, high conversions, short reaction times and cleaner reaction profiles are
some of the advantages of this method. Moreover, H2O/EtOH (7:3) was selected as a green solvent.