Copper Nanoparticle-Doped Silica Cuprous Sulfate as a Highly Efficient and Reusable Heterogeneous Catalysis for N-Arylation of Nucleobases and N-Heterocyclic Compounds
作者:Mohammad Soltani Rad、Somayeh Behrouz、Mohammad Doroodmand、Noushin Moghtaderi
DOI:10.1055/s-0030-1260236
日期:2011.12
A facile and simple protocol for Ullmann-type N-arylation of nucleobases with aryl halides is described using copper nanoparticle-doped silica cuprous sulfate (CN-DSCS) as a new and efficient heterogeneous catalysis. In this method, treatment of various nucleobases and aryl halides in the presence of DBU and CN-DSCS in refluxing DMF furnishes the corresponding N-aryl adducts in reasonable to good yields. The CN-DSCS was fully characterized by different microscopic, spectroscopic and physical techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), inductively coupled plasma (ICP) analysis, thermogravimetric analysis (TGA), and FT-IR. The CN-DSCS was proved to be a chemically and thermally stable, cheap, and environmentally compatible heterogeneous nanocatalyst that can be reused for many consecutive experiments without any considerable decrease in its reactivity.
我们描述了一种简单且有效的乌尔曼型N-芳基化核苷酸与芳基卤化物的合成方法,使用掺铜纳米颗粒的二氧化硅硫酸铜(CN-DSCS)作为新的高效的非均相催化剂。在该方法中,在DBU和CN-DSCS存在下,将多种核苷酸与芳基卤化物在回流的DMF中处理,能够合理至良好地生成相应的N-芳基加成物。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、原子力显微镜(AFM)、X射线衍射(XRD)、电感耦合等离子体(ICP)分析、热重分析(TGA)和FT-IR等多种显微、光谱和物理技术对CN-DSCS进行了全面表征。研究表明,CN-DSCS是一种化学和热稳定性强、廉价且环境友好的非均相纳米催化剂,可以在多个连续实验中重复使用,而其反应活性几乎没有显著下降。