This work describes a new method for a one-pot multicomponent condensation of a variety of aldehydes with dimedone and malononitrile in water, providing a simple and effectual procedure for preparing 4H-chromene under reflux conditions with magnetic nanoparticles supported on functionalized 7-aminonaphthalene-1,3-disulfonic acid-functionalized silica as catalyst. (Fe3O4@SiO2@Propyl–ANDSA) has been investigated as a novel catalyst in this reaction. This protocol is novel in (1) avoiding toxic solvents (2) introducing a catalyst with ideal features such as chemical stability, low toxicity, cost-effectiveness and, most importantly, easy, fast and comfortable separation using an external magnet.
本研究描述了一种新的方法,在
水相中通过一步法多元共聚技术将多种醛与二甲基二酮和
丙二腈反应,使用负载在功能化7-
氨基
萘-1,3-二
磺酸-功能化
硅胶上的磁性纳米粒子(
Fe3O4@SiO2@丙基-AND
SA)作为催化剂,在回流条件下简单高效地制备了4H-色烯。这种催化剂作为新型催化剂在该反应中被研究。该方案的创新点在于(1)避免了有毒溶vents的应用;(2)引入了一种具有理想特性的催化剂,如
化学稳定性、低毒性、成本效益高,最重要的是,利用外置磁
铁实现快速、简单和舒适的分离。