Heterogenization of an imidazolium ionic liquid based on magnetic carbon nanotubes as a novel organocatalyst for the synthesis of 2-amino-chromenes via a microwave-assisted multicomponent strategy
作者:Zohre Zarnegar、Javad Safari
DOI:10.1039/c6nj01631f
日期:——
ysilylpropyl)-1H-imidazol-3-ium chloride. This nanocomposite was found to be an efficient organocatalyst for the synthesis of 2-amino-chromenes via a microwave-assisted multicomponentstrategy in aqueous media. The attractive features of this simple method include easy isolation of products, milder and cleaner reaction conditions, higher yields and purity of the product and an easier work-up procedure
合成了咪唑鎓离子液体功能化的磁性多壁碳纳米管(CNTs–Fe 3 O 4 –IL),并使用FT-IR,VSM,SEM,TEM,XRD,TGA等不同的表征技术研究了纳米复合材料的结构,形态和性能。和DTA。为了合成CNT-Fe 3 O 4 -IL,用1-甲基-3-(3-三甲氧基甲硅烷基丙基)-1 H-咪唑-3-氯化铵对碳纳米管上负载的磁铁矿(CNT-Fe 3 O 4)进行了改性。此纳米复合材料被认为是为2-氨基-色烯合成的高效有机催化剂通过水性介质中的微波辅助多组分策略。这种简单方法的吸引人的特点包括:易于分离产物,较温和,更清洁的反应条件,较高的产率和纯度的产物以及较简便的后处理程序。只需施加外部磁场即可轻松分离出这种非均相催化剂,并且可循环使用的有机催化剂可以重复使用几次,而不会造成任何明显的活性损失。离子液体和磁性固体载体纳米材料的优点的结合提供了进行催化过程的环境友好的程序。
Magnetic Fe<sub>3</sub>O<sub>4</sub> Nanoparticles as Efficient and Reusable Catalyst for the Green Synthesis of 2-Amino-4<i>H</i>-chromene in Aqueous Media
作者:Javad Safari、Zohre Zarnegar、Marzieh Heydarian
DOI:10.1246/bcsj.20120209
日期:2012.12.15
A simple and efficient protocol for one-pot three-component coupling of aldehyde, malononitrile, and resorcinol in water using magnetically recoverable Fe3O4 nanoparticles at room temperature is reported. The high yields of products and short reaction time were attributed to the nanosize of about 18 nm in which the catalyst could act as a nanoreactor. This methodology is found to be fairly general and catalyst is easily separated by magnetic devices and can be reused without any apparent loss of activity for the reaction.
Ultrasound assisted the green synthesis of 2-amino-4H-chromene derivatives catalyzed by Fe3O4-functionalized nanoparticles with chitosan as a novel and reusable magnetic catalyst
作者:Javad Safari、Leila Javadian
DOI:10.1016/j.ultsonch.2014.02.002
日期:2015.1
Fe3O4 nanoparticles were prepared by chemical coprecipitation method. Subsequently immobilization of chitosan on Fe3O4 nanoparticles was accomplished and afforded magnetic Fe3O4-chitosan nanoparticles. Synthesized nanoparticles was found to be a magnetic and heterogeneous catalyst for a one-pot and efficient synthesis of 2-amino-4H-chromenes by condensation of aldehydes with malononitrile and resorcinol
采用化学共沉淀法制备了Fe3O4纳米粒子。随后完成壳聚糖在Fe 3 O 4纳米颗粒上的固定,并提供磁性Fe 3 O 4-壳聚糖纳米颗粒。发现合成的纳米颗粒是磁性的和非均相的催化剂,用于在超声波辐射下通过醛与丙二腈和间苯二酚的缩合反应一锅法高效合成2-氨基-4H-色烯,这是一种生态友好的方法。这种方便的步骤使我们能够在短时间内以超声波辐照获得产品,并且无需使用有害催化剂即可获得优异的收率。本方法将允许2-氨基-4H-色烯家族内多样性的进一步增加。
Ultrasonic activated efficient synthesis of chromenes using amino-silane modified Fe3O4 nanoparticles: A versatile integration of high catalytic activity and facile recovery
作者:Javad Safari、Zohre Zarnegar
DOI:10.1016/j.molstruc.2014.04.023
日期:2014.8
Abstract An efficient synthesis of 2-amino-4 H -chromenes is achieved by one pot three component coupling reaction of aldehyde, malononitrile, and resorcinol using amino-silane modified Fe3O4 nanoparticles (MNPs-NH 2 ) heterogeneous nanocatalyst under sonic condition. The attractive advantages of the present process are mild reaction conditions, short reaction times, easy isolation of products,