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。
Introduction of taurine (2-aminoethanesulfonic acid) as a green bio-organic catalyst for the promotion of organic reactions under green conditions
作者:Farhad Shirini、Nader Daneshvar
DOI:10.1039/c6ra15432h
日期:——
derivatives are simply prepared via a three-component reaction in the presence of taurine as the catalyst. All these reactions are performed in water, a green solvent. The advantages of using of taurine as the catalyst are it is environmentally friendly, low cost, commercially available, easy to separate from the reaction mixture, and has high reusability. Use of this catalyst results in acceptable reaction
Glycerol is applied as a green, biodegradable and reusable promoting medium for one-pot three component synthesis of 4H-pyrans under catalyst-free conditions. A broad range of substrates including aromatic and heteroaromatic aldehydes, isatine derivatives, acenaphthenequinone and ninehydrine are condensed with carbonyl compounds possessing a reactive α-methylene group and alkylmalonates. All reactions are completed in short times, and the products are obtained in good to excellent yields. The reaction medium could be recycled and reused several times without any loss of efficiency.
Efficient synthesis of 2-amino-3-cyano-4H-pyran derivatives via a non-catalytic one-pot three-component reaction
作者:Cheng-Wei Lü、Jia-Jing Wang、Fei Li、Shi-Jun Yu、Yue An
DOI:10.1007/s11164-017-3151-9
日期:2018.2
Abstract A convenient one-pot multi-component strategy was conducted successfully under catalyst-free conditions employing water and PEG-400 as the efficient and cheap promoting medium. Three types and nearly 50 2-amino-3-cyano-4H-pyran annulated derivatives were synthesized in good to excellent yields by the condensation of a series of aromatic aldehydes with malononitrile and different 1,3-dicarbonyl
Design of a new unsymmetrical bis (imino) pyridine Schiff-base co-complex with an ionic liquid group as a recyclable green catalyst to prepare chromenes derivatives from benzylic alcohol
conditions, the alcohol derivatives were first oxidized by the catalyst, followed by malononitrile and diketone additions to the reaction vessel. Recovery and reusability of the catalyst were investigated, which showed excellent results. The presence of ionicliquidgroups increased the solubility of the heterogeneous catalyst in green solvents, which increased the efficiency and reduced the reaction
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