The synthesis of novel 4-substituted-3,4-dihydro-6H-pyrano[3,2-c]quinoline-2,5-diones was accomplished efficiently via a three-component reaction between 4-hydroxyquinoline-2-one, Meldrum's acid, and an alkyl or arylaldehyde under catalysis by [Bmim]HSO4. The ionic liquid catalyst offers the advantage of realizing the synthesis of the title products at ambient temperature and widens the scope of the reactants to include aliphatic aldehydes with respect to the catalysts already applied for similar syntheses. (C) 2013 Elsevier Ltd. All rights reserved.
One-pot synthesis of pyrano[3,2-c]quinoline-2,5-dione derivatives by Fe3O4@SiO2-SO3H as an efficient and reusable solid acid catalyst
an efficient and reusable solid acid catalyst and its catalytic activity was considered in the synthesis of pyrano[3,2-c]quinoline-2,5-dione derivatives by the three-component reaction of 4-hydroxyquinolin-2(1H)-one, Meldrum’s acid and arylaldehydes under thermal solvent-free conditions at 70 °C. This catalytic system can be reused minimally for five times without any noticeable loss of activity. In
摘要在这项研究中,Fe 3 O 4 @SiO 2 -SO 3 H被制备为一种有效且可重复使用的固体酸催化剂,并在合成吡喃并[3,2 - c ]喹啉-2,5-二酮中考虑了其催化活性。在70℃无溶剂的条件下,通过4-羟基喹啉-2(1 H)-one,Meldrum酸和芳醛的三组分反应生成衍生物。该催化系统可以最少重复使用五次,而不会造成任何明显的活性损失。另外,Fe 3 O 4 @SiO 2 -SO 3的特性分析进行热重分析,傅立叶变换红外光谱,振动样品磁力计,扫描电子显微镜,X射线衍射等H。 图形概要