Secondary amines immobilized inside magnetic mesoporous materials as a recyclable basic and oxidative heterogeneous nanocatalyst for the synthesis of trisubstituted pyrimidine derivatives
作者:Reza Aryan、Hamid Beyzaei、Masoomeh Nojavan、Tahereh Dianatipour
DOI:10.1007/s11164-015-2284-y
日期:2016.5
A novel magnetic MCM-41 nanocomposite-based catalyst is reported for the first time in the multicomponent synthesis of trisubstituted pyrimidines in which piperazine is immobilized inside the mesochannels of magnetic MCM-41 as an organic base (α-Fe2O3-MCM-41-piperazine). This nanocatalyst was thoroughly characterized by various techniques such as FT-IR, XRD, SEM, TEM, EDX and N2-adsorption isotherms. Very uniform dispersion and ordered mesopores of α-Fe2O3-MCM-41 causes piperazine molecules to be distributed very finely on the internal surface of the pores, resulting in a very useful and robust magnetically recyclable amine-based heterogeneous nanocatalyst. This catalytic system showed remarkable activity in the solvent-free synthesis of 2,4,6-trisubstituted pyrimidine derivatives.
首次报告了一种基于新型磁性MCM-41纳米复合材料的催化剂,用于三取代吡啶的多组分合成,其中哌嗪被固定在磁性MCM-41的介孔内部,作为有机碱(α-Fe2O3-MCM-41-哌嗪)。该纳米催化剂通过多种技术(如FT-IR、XRD、SEM、TEM、EDX和N2吸附等温线)进行了全面表征。α-Fe2O3-MCM-41的极其均匀的分散和有序的介孔结构使哌嗪分子能够在孔的内表面上非常细致地分布,从而形成了一种非常有用且强健的可磁回收胺基异质纳米催化剂。该催化体系在无溶剂条件下合成2,4,6-三取代吡啶衍生物时表现出显著的活性。