A new procedure has been developed for the synthesis of 4-alkyl-6,8-dibromo-7-hydroxy-2-oxo-2H-chromene-3-carbonitriles by bromination of 2-amino-4-alkyl-4H-chromene-3-carbonitriles with bromine in acetic acid, followed by hydrolysis.
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。
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.
One-pot synthesis of 4-alkyl-2-amino-4<i>H</i>-chromene derivatives
作者:Ivan N. Bardasov、Anastasiya U. Alekseeva、Oleg V. Ershov、Dmitry A. Grishanov
DOI:10.1515/hc-2015-0077
日期:2015.6.1
Abstract
A one-pot synthesis of 4-alkyl-2-amino-4H-chromene derivatives by base-initiated reactions of aliphatic aldehydes, malononitrile, and resorcinol in water is described.
作者:I. N. Bardasov、A. Yu. Alekseeva、N. L. Malyshkina、O. V. Ershov、M. D. Surazhskaya、D. A. Grishanov
DOI:10.1134/s1070428016070101
日期:2016.7
A new procedure has been developed for the synthesis of 4-alkyl-6,8-dibromo-7-hydroxy-2-oxo-2H-chromene-3-carbonitriles by bromination of 2-amino-4-alkyl-4H-chromene-3-carbonitriles with bromine in acetic acid, followed by hydrolysis.
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。