CuI nanoparticles: a highly active and easily recyclable catalyst for the synthesis of 2-amino-3,5-dicyano-6-sulfanyl pyridines
摘要:
CuI nanoparticles as a worthwhile and reusable catalyst supply an eco-friendly procedure for the synthesis of 2-amino-3,5-dicyano-6-sulfanyl pyridine derivatives. The products were obtained in high yields and short reaction times via multicomponent reaction of aldehydes, malononitrile and thiols under reflux conditions. The method presented is mild, efficient, inexpensive and satisfactory to give the products in the presence of novel nanoscale materials.
SnO nanoparticles have been used as an efficientcatalyst for the preparation of chromeno[2,3-b]pyridines and 2-amino-3,5-dicyano-6-sulfanyl pyridines under reflux conditions in ethanol in good to excellent yields. This flexible and nano-catalytic procedure showed good recyclability and provides a clean condensation reaction in a short reaction time.
SnO纳米颗粒已被用作高效的催化剂,用于在乙醇中回流条件下以良好至极好的收率制备苯并[2,3- b ]吡啶和2-氨基-3,5-二氰基-6-硫烷基吡啶。这种灵活的纳米催化程序显示出良好的可回收性,并在较短的反应时间内提供了干净的缩合反应。
TiO
<sub>2</sub>
‐nanoparticles as efficient catalysts for the synthesis of pyridine dicarbonitriles
prepared via an ordinary or a magnetized process, are investigated in the synthesis of pyridinedicarbonitriles by one‐pot multicomponent reaction of 4‐methyl thiophenol, malononitrile, and aryl aldehydes. The results have shown that both prepared nano‐TiO2 exhibited high catalytic activities toward the synthesis of pyridinedicarbonitrile derivatives but the nano‐TiO2, which is prepared via a magnetized process
DBU-catalyzed three-component one-pot synthesis of highly functionalized pyridines in aqueous ethanol
作者:Ritu Mamgain、Ram Singh、Diwan S. Rawat
DOI:10.1002/jhet.32
日期:2009.1
1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) efficiently catalyzes three-componentone-pot condensations of aldehyde, malononitrile, and thiophenol to produce highlyfunctionalized pyridines in excellent yield in aqueous ethanol. J. Heterocyclic Chem., 46, 69 (2009).
A novel basic ionic liquid, 1-(2-aminoethyl)pyridinium hydroxide, containing both Brønsted base and Lewis base sites has been used as an efficient catalyst for the synthesis of 2-amino-4-phenyl-6-(phenylsulfanyl)-3,5-dicyanopyridines. The condensation and oxidation tandem reaction of aldehydes, malononitrile, and thiols, performed in aqueous ethanol, afforded reasonable to good yields within 30–60 min. After the reaction, the catalyst could be recycled and reused. A possible mechanism to account for the tandem reaction is proposed. .
2-Hydroxyethylammonium acetate: A reusable task-specific ionic liquid promoting one-pot, three-component synthesis of 2-amino-3,5-dicarbonitrile-6-thio-pyridines
作者:Sara Sobhani、Moones Honarmand
DOI:10.1016/j.crci.2012.10.011
日期:2013.3
Abstract 2-Hydroxyethylammonium acetate (2-HEAA) as a task-specific ionicliquid, efficiently promotesone-potthree-component reaction of aryl/heteroaryl/alkyl aldehydes with aryl/alkyl thiols and malononitrile at room temperature. This protocol offers several advantages such as using a reusable and cost-effective ionicliquid, being amenable to scale-up and produces the corresponding 2-amino-3,5