A superparamagnetic graphene oxide (GO)/Fe3O4–CuBr catalyst was prepared via a simple chemical method and characterized by Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The GO/Fe3O4–CuBr catalyst could be dispersed homogeneously in water and further used as an excellent semi-heterogeneous catalyst for the one-pot multi-component Cu(I)-catalyzed azide-alkyne 1,3-dipolar cycloaddition (CuAAC) reaction. 1,4-Disubstituted mono/bis-1,2,3-triazoles are readily obtained on a multi-gram scale by the reaction of aryl/alkyl halides, alkynes and sodium azide under microwave irradiation conditions in good to excellent yields. Moreover, GO/Fe3O4–CuBr could be separated conveniently from the reaction mixtures by an external permanent magnet and reused in at least six consecutive runs without a noticeable drop in the product yield and its catalytic activity.
通过简单的
化学方法合成了一种超顺磁性的氧化
石墨烯 (GO)/
Fe3O4–CuBr 催化剂,并通过傅里叶变换红外光谱 (FTIR)、热重分析 (TGA)、透射电子显微镜 (
TEM)、粉末 X 射线衍射 (XRD) 和 X 射线光电子能谱 (XPS) 进行了表征。GO/ –CuBr 催化剂可以在
水中均匀分散,进一步作为一种优良的半均相催化剂,用于一锅法多组分 Cu(I) 催化的
叠氮-
炔烃 1,3-偶极环加成反应(Cu
AAC)。在微波辐射条件下,通过芳基/烷基卤化物、
炔烃和
叠氮化
钠的反应,能以良好到优秀的产率在多克规模上迅速获得 1,4-二取代的单/双-
1,2,3-三唑。此外,GO/ –CuBr 可以通过外部永久磁
铁方便地从反应混合物中分离,并在至少六个连续反应中重复使用,且产品产率和催化活性没有明显下降。