High-efficient synthesis of 2-imino-2H-chromenes and dihydropyrano[c]chromenes using novel and green catalyst (CaO@SiO2@AIL)
作者:Fatemeh Sameri、Akbar Mobinikhaledi、Mohammad Ali Bodaghifard
DOI:10.1007/s11164-020-04295-5
日期:2021.2
recyclable heterogeneous ionic liquid catalyst was synthesized. Catalytic activity of the CaO@SiO 2 @AIL hybrid nanoparticles was investigated for synthesis of the pharmaceutically valuable 2-imino-2 H- chromene and dihydropyrano[ c ]chromene derivatives. A wide range of amines and aromatic aldehydes containing either electron-withdrawing or electron-donating substituent were examined using optimized conditions
在这项工作中,1,3,5,7-四氮杂金刚烷-1-氯化铵(AIL)功能化二氧化硅包覆的氧化钙杂化纳米催化剂(CaO@SiO 2 @AIL)作为一种新型、高效、绿色和可回收的非均相离子液体催化剂被合成了。研究了 CaO@SiO 2 @AIL 杂化纳米粒子的催化活性,用于合成具有药学价值的 2-亚氨基-2 H-色烯和二氢吡喃[c]色烯衍生物。使用优化的条件检查了各种含有吸电子或给电子取代基的胺和芳香醛,以生产所需的产品。2-亚氨基-2 H-色烯在无溶剂条件下合成,二氢吡喃[c]色烯在绿色条件下在水性介质中制备,反应时间短、收率高、后处理简单。通过傅里叶变换红外光谱、X射线粉末衍射、扫描电子显微镜、能量色散X射线光谱、WDS图扫描、热重和元素分析来考虑核/壳杂化纳米颗粒的结构确认和表面性质。这种 IL 负载的多相纳米催化剂可以重复使用至少六次,而不会显着降低其性能。