Fe 3 O 4 @SiO 2上新型不对称配体及其包含离子液体(ILs)基团的钴配合物的制备和表征,通过1 H-NMR、13 C-NMR、FTIR、SEM、EDX、TGA、XRD、和VSM。该催化剂用于由醇制备色烯化合物的反应。研究了催化剂用量、温度、溶剂和溶剂用量作为影响反应的因素。为了在最佳条件下合成色烯衍生物,醇衍生物首先被催化剂氧化,然后将丙二腈和二酮添加到反应容器中。对催化剂的回收和再利用进行了研究,结果显示出良好的结果。离子液体基团的存在增加了多相催化剂在绿色溶剂中的溶解度,从而提高了效率并减少了反应时间。 图形概要
This work is focused on the development of an efficient and green protocol for the one-pot multicomponent synthesis of a series of 4H-pyran derivatives.
这项工作专注于开发一个高效且环保的一锅多组分合成协议,用于合成一系列4H-吡喃衍生物。
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
Magnetically separable Fe3O4 nanoparticles were used as an environmental friendly catalyst for the synthesis of mono- and bis-tetrahydro-4H-chromene and mono- and bis-1,4-dihydropyridine derivatives via three-component reactions of aromatic aldehydes and malononitrile with cyclic β-dicarbonyls or cyclic β-enaminoketones respectively. These reactions were carried out in EtOH and at reflux. Fe3O4 nanoparticles can be magnetically separated from the reaction mixture by a magnet and recycled without significant loss of catalytic activity.
Mn(III)-pentadentate Schiff base complex supported on multi-walled carbon nanotubes as a green, mild and heterogeneous catalyst for the synthesis of tetrahydrobenzo[<i>b</i>
]pyrans via tandem Knoevenagel-Michael cyclocondensation reaction
作者:Jamshid Rakhtshah、Sadegh Salehzadeh、Mohammad Ali Zolfigol、Saeed Baghery
DOI:10.1002/aoc.3690
日期:2017.9
coupled plasma mass spectrometry, elemental analysis and thermogravimetric analysis. A facile, eco‐friendly, mild and green procedure was developed for the one‐pot three‐component synthesis of tetrahydrobenzo[b]pyrans via tandem Knoevenagel–Michael cyclocondensation reactions between aromatic aldehydes, 1,3‐diones and malononitrile using a catalytic amount of Mn(III)–pentadentate Schiff base complex
Cheap thiamine hydrochloride as efficient catalyst for synthesis of 4H-benzo[b]pyrans in aqueous ethanol
作者:Lu Chen、Sunan Bao、Lixiang Yang、Xian Zhang、Bin Li、Yibiao Li
DOI:10.1007/s11164-016-2843-x
日期:2017.7
Preparation of pharmaceutically active 2-amino-4H-pyran derivatives has been achieved using cheap thiamine hydrochloride as catalyst. A wide range of aromatic aldehydes easily undergo condensation with malononitrile and several kinds of 1,3-cyclohexanedione under mild condition to afford the desired product with good purity in excellent yield. This protocol has various advantages as a simple, clean, and environmentally benign three-component process.
A nano-organo catalyzed route towards the efficient synthesis of benzo[b]pyran derivatives under ultrasonic irradiation
作者:Ridaphun Nongrum、Geetmani Singh Nongthombam、Mattilang Kharkongor、Jims World Star Rani、Noimur Rahman、Chingrishon Kathing、Bekington Myrboh、Rishanlang Nongkhlaw
DOI:10.1039/c6ra24108e
日期:——
reaction time and use of green solvents. Ultrasound energy has been meticulously exploited for the synthesis of a nano-organocatalyst as well as for the preparation of several benzo[b]pyranderivatives. The biological activity of the synthesized benzo[b]pyrans were investigated and one of the derivatives was found to demonstrate profound activity in suppressing the side-effects of chlorpyrifos, an insecticide
本文报道了在超声条件下由维生素B 1官能化的Fe 2 O 3 @SiO 2 NPs催化的高效一锅合成苯并[ b ]吡喃。纳米有机催化剂的合成和表征通过FT-IR,TEM,EDS,粉末X射线衍射,等等若干苯并[ b以令人满意的产率制备了]吡喃衍生物,并且磁性回收和再循环了纳米催化剂。该方案的显着特征包括方便的后处理程序,温和的反应条件,容易的催化剂回收,较短的反应时间和绿色溶剂的使用。超声波能量已经被精心开发用于合成纳米有机催化剂以及制备几种苯并[ b ]吡喃衍生物。合成的苯并[生物活性b ]吡喃进行了调查和衍生物中的一种被发现表现出在抑制毒死蜱的副作用,对的外部鳃的形态杀虫剂深刻活性黑眶蟾蜍蝌蚪。