摘要 Ni–Al 2 O 3是一种高效且可重复使用的非均相催化剂,用于在EtOH / H 2 O(1:1)溶剂介质中通过萘酚,醛和丙二腈的一锅三组分反应合成萘并吡喃。Ni-Al 2 O 3与中性Al 2 O 3的比较研究表明,与前者的反应提供了更高的产物收率,表明具有更高的催化效率。Ni-Al 2 O 3的价格低,活性好,易于处理,易于回收,产率高,纯化方法简单等特点使该方法具有很高的适用性。 图形概要
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.
Synthesis and characterization of a novel Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>–BenzIm-Fc[Cl]/BiOCl nano-composite and its efficient catalytic activity in the ultrasound-assisted synthesis of diverse chromene analogs
ultrasound-assisted synthesis protocol that was studied in this article exhibits some notable advantages such as short reaction times, operational simplicity, green reaction conditions, high yields and easy work-up and purification steps. In addition, the novel magnetic nano-composite could be easily recovered by an external magnetic field and reused for six-reaction cycles without significant loss of its catalytic
Triethanolamine-catalyzed expeditious and greener synthesis of 2-amino-4<i>H</i>
-chromenes
作者:Anilkumar S. Patel、Satishkumar D. Tala、Pankajkumar B. Nariya、Kartik D. Ladva、Naval P. Kapuriya
DOI:10.1002/jccs.201800203
日期:2019.3
Triethanolamine (TEOA), an inexpensive and eco‐friendly base, was used to efficiently catalyze the three‐component condensation reaction of heterocyclic/aromatic aldehyde, (α/β)‐naphthol, and malononitrile in water to give the corresponding substituted 2‐amino‐4H‐chromene derivatives with excellent yields.
Studies on the Synthesis of Substituted 2-amino-4<i>H</i>-benzo[<i>h</i>]chromene and 3-amino-1<i>H</i>-benzo[<i>f</i>]chromene Derivatives Using Base Supported Ionic Liquid Like-phase (SILLP) as an Efficient Green Catalyst
The synthesis of several substituted 2-amino-4H-benzo[h]chromene and 3-amino-1H-benzo[f]chromenederivatives was carried out using a one-pot three-component reaction of an arylaldehyde, malononitrile and a naphthol in H2O and in the presence of recyclable base supported ionicliquid like-phase as an efficient green catalyst.
Multi-component synthesis of 2-amino-4H-chromenes catalyzed by nano ZnO in water
作者:Mona Hosseini-Sarvari、Sara Shafiei-Haghighi
DOI:10.1135/cccc2011050
日期:——
Naphthalenediols, 1- and 2-naphthols, and phenols in the presence of nano ZnO as catalyst and water as green solvent react with methylenemalononitrile, generated in situ from aldehyde and malononitrile, to yield 2-amino-4H-chromenes.