An efficient synthetic method for the preparation of β-enaminones catalyzed by immobilization of SnCl2 on Zr-metal–organic frameworks (UiO-66 MOF) and designated as SnUiO66 is described. Also the prepared catalyst was characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy and N2 adsorption and desorption techniques. XPS and DFT studies on Sn UiO66 were consistent with the immobilization of Sn chloride as SnIV on MOF. A variety of β-enaminones were synthesized via reaction of primary aromatic amines with acetylacetone. It was found that SnUiO66 shows moderate-to-high catalytic activity for enamination reactions. The catalyst was found to be reusable up to four catalytic cycles without any appreciable loss in activity.
报道了一种通过将SnCl2固定在Zr-
金属有机框架(UiO-66 MOF)上并命名为SnUiO66的高效β-烯胺酮合成方法。此外,制备的催化剂通过傅里叶变换红外光谱、X射线光电子光谱(XPS)、能量色散X射线光谱和氮气吸附脱附技术进行了表征。XPS和DFT对Sn UiO66的研究与Sn
氯化物以SnIV形式固定在MOF上相一致。通过一级芳香胺与
乙酰丙酮的反应合成了多种β-烯胺酮。研究发现,SnUiO66在烯胺化反应中表现出中等至高的催化活性。该催化剂在连续四个催化循环中可重复使用,活性几乎无损失。