SO 3 H-官能化的纳米MGO-D-NH 2催化剂是通过磁性氧化石墨烯(GO)纳米杂化物的多官能化制备的,并在四氢苯并[ b ]吡喃和吡喃[2,3- d ]嘧啶酮衍生物。通过改进的Hummers方法制备GO / Fe 3 O 4(MGO)杂化物,然后将1,4-丁磺酸内酯与已制备的聚酰胺型胺官能化MGO(MGO-D-NH 2)得到双功能化的磁性纳米粒子作为催化剂。表征所制备的纳米颗粒以确认其合成并精确确定其理化性质。总之,就反应时间和产物产率而言,制备的催化剂显示出显着的可循环性和催化性能。希望这项研究的结果有助于开发新型的非均相催化剂,以显示出高性能并作为工业应用的优秀候选者。
1-Methylimidazolium tricyanomethanide {[HMIM]C(CN)3} as a nano structure and reusable molten salt catalyst for the synthesis of tetrahydrobenzo[b]pyrans via tandem Knoevenagel-Michael cyclocondensation and 3,4-dihydropyrano[c]chromene derivatives
作者:Mohammad Ali Zolfigol、Neda Bahrami-Nejad、Fatemeh Afsharnadery、Saeed Baghery
DOI:10.1016/j.molliq.2016.06.069
日期:2016.9
An expeditious, experimentally simple and rapid 1-methylimidazolium tricyanomethanide [HMIM]C(CN)3} nano molten salt (NMS) catalyzed tandem Knoevenagel-Michael cyclocondensation procedure for the synthesis of tetrahydrobenzo[b]pyrans was described via reaction between dimedone, aromatic aldehyde and malononitrile under solvent-free conditions at room temperature. Furthermore, 3,4-dihydropyrano[c]chromene
通过二甲酮之间的反应,描述了一种快速,实验简单且快速的三氰基甲基1-甲基咪唑鎓[HMIM] C(CN)3 }纳米熔融盐(NMS)催化串联Knoevenagel-Michael环缩合反应合成四氢苯并[ b ]吡喃的方法,室温下在无溶剂条件下的芳族醛和丙二腈。此外,在相同条件下,以[HMIM] C(CN)3 } NMS为催化量,通过4-羟基香豆素,芳香醛和丙二腈的缩合反应合成了3,4-二氢吡喃并[ c ]色烯衍生物。
Fe3O4@SiO2@Propyl–ANDSA: as a new catalyst for one-pot synthesis of 4H-chromene
This work describes a new method for a one-pot multicomponent condensation of a variety of aldehydes with dimedone and malononitrile in water, providing a simple and effectual procedure for preparing 4H-chromene under reflux conditions with magnetic nanoparticles supported on functionalized 7-aminonaphthalene-1,3-disulfonic acid-functionalized silica as catalyst. (Fe3O4@SiO2@Propyl–ANDSA) has been investigated as a novel catalyst in this reaction. This protocol is novel in (1) avoiding toxic solvents (2) introducing a catalyst with ideal features such as chemical stability, low toxicity, cost-effectiveness and, most importantly, easy, fast and comfortable separation using an external magnet.
Horsetail plant (Equisetum arvense) and horsetail plant ash: application and comparison of their catalytic activities as novel and natural porous lewis acid catalysts for the one-pot green synthesis of 2-amino-4H-chromene derivatives under solvent-free conditions
作者:Nina Hosseini Mohtasham、Mostafa Gholizadeh
DOI:10.1007/s13738-019-01777-1
日期:2020.2
area, porosity, and crystalline structure which can affect their catalytic activities. The synthesis of 2-amino-4H-chromene derivatives was performed via a one-potthree-component condensation of dimedone, malononitrile, and various aromatic aldehydes to compare their catalytic activities under solvent-free conditions. Due to its high porosity and high surface area, horsetail ash yields better results
Synthesis, molecular modeling and BACE-1 inhibitory study of tetrahydrobenzo[b] pyran derivatives
作者:Vijaya Bhaskar、Reshma Chowdary、Sheshagiri R. Dixit、Shrinivas D. Joshi
DOI:10.1016/j.bioorg.2018.11.023
日期:2019.3
documented as one of the possible therapeutic targets for the treatment of Alzheimer's disease. In this paper, we report the synthesis and the for β-secretase (BACE-1) inhibitory activity of new series of tetrahydrobenzo [b] pyranderivatives. One-pot synthesis of tetrahydrobenzo [b] pyrans was carried out by condensing aromatic aldehyde, malononitrile and 1,3-cyclohexanedione using ionic liquid 1-butyl-3-methyl
Introducing rGO@Fe
<sub>3</sub>
O
<sub>4</sub>
@Ni as an efficient magnetic nanocatalyst for the synthesis of tetrahydrobenzopyranes via multicomponent coupling reactions of dimedone, malononitrile, and aromatic aldehydes
作者:Mozhgan Esmati、Behzad Zeynizadeh
DOI:10.1002/aoc.6496
日期:2022.2
rGO@Fe3O4@Ni as the efficientmagneticnanocatalyst was applied to expedite the multicomponent coupling reactions (MCRs) of dimedone, malononitrile, and structurally diverse aromatic aldehydes to prepare tetrahydrobenzopyranes. All reactions were fulfilled efficiently in deionized water under reflux conditions. In addition, sustainability of the nanocatalyst was examined for five consecutive reaction cycles without
在这项研究中,研究了改性 GO 和 rGO@Fe 3 O 4 @Ni 复合体系的合成和表征。傅里叶变换红外光谱 (FT-IR)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、能量色散 X 射线光谱 (EDX)、X 射线粉末衍射 (XRD)、振动样品磁力计 (VSM) )、Brunauer-Emmett-Teller (BET) 分析、热重分析 (TGA) 和电感耦合等离子体发射光谱 (ICP-OES) 用于表征制备的纳米材料。此外,还比较了 GO、rGO@Fe 3 O 4、rGO@Ni 和 rGO@Fe 3 O 4 @Ni 和 rGO @Fe 3 O的催化活性。4 @Ni 作为高效的磁性纳米催化剂被应用于加速二甲酮、丙二腈和结构多样的芳香醛的多组分偶联反应 (MCR) 以制备四氢苯并吡喃。所有反应均在去离子水中在回流条件下有效地进行。此外,纳米催化剂的可持续性在五个连续的反应循环