Nano-cellulose/BF3/Fe3O4: a magnetic bio-based nano-catalyst for the synthesis of pyrimido[2,1-b]benzothiazoles under solvent-free conditions
作者:Bi Bi Fatemeh Mirjalili、Fatemeh Aref
DOI:10.1007/s11164-018-3401-5
日期:2018.7
Nano-cellulose/BF3/Fe3O4 is a bio-based and eco-friendly catalyst with high catalytic activity. Easy separation with an external magnet and recyclability without significant loss of its activity are some advantages of this catalyst. Nano-cellulose/BF3/Fe3O4 was characterized by Fourier transform infrared spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray fluorescence, vibrating sample magnetometry, thermogravimetric analysis, and BET theory. The catalyst was applied for the synthesis of 4H-pyrimido[2,1-b]benzothiazole derivatives via one-pot condensation of aldehydes, 2-aminobenzothiazol and ethyl acetoacetate, under solvent-free conditions at 100 °C. This method offers several advantages including easy work-up, excellent yields and short reaction time.
纳米纤维素/BF3/Fe3O4 是一种生物基环保催化剂,具有很高的催化活性。这种催化剂的一些优点是易于用外部磁铁分离,而且可回收利用,其活性不会明显降低。傅立叶变换红外光谱、场发射扫描电子显微镜、透射电子显微镜、X 射线衍射、X 射线荧光、振动样品磁力计、热重分析和 BET 理论对纳米纤维素/BF3/Fe3O4 进行了表征。催化剂被用于在 100 ℃ 无溶剂条件下,通过醛、2-氨基苯并噻唑和乙酰乙酸乙酯的一锅缩合合成 4H-嘧啶并[2,1-b]苯并噻唑衍生物。该方法具有操作简便、产率高和反应时间短等优点。