A new series of phenylpyrido[4,3-d]pyrimidin-2-amin derivatives have been synthesised from the reaction of (E)-3,5-bis(benzylidene)-4-piperidones and guanidine carbonate in the presence of (Fe2O3)-MCM-41-nPrNH2 as a magnetically recoverable nanocatalyst under solvent free conditions. This catalyst was highly recyclable (up to 5 times) and was easily recovered from the reaction mixture using an external magnet without loss of activity. The prepared magnetic catalyst is characterized by Fourier transform infrared (FT-IR), X-ray powder diffraction (XRD), and nitrogen physisorption measurements. Also all the structures of title compounds 3a–h were elucidated by comprehensive 1H NMR,13C NMR, IR and Mass spectra.
在无溶剂条件下,以 (
Fe2O3)-MC
M-41-nPrNH2 为磁性可回收纳米催化剂,通过 (E)-3,5-双(亚苄基)-
4-哌啶酮和
碳酸胍的反应合成了一系列新的苯基
吡啶并[4,3-d]
嘧啶-2-
氨基衍
生物。这种催化剂具有很强的可回收性(最多可回收 5 次),使用外部磁
铁就能轻松地从反应混合物中回收,且不会丧失活性。所制备的磁性催化剂通过傅立叶变换红外(FT-IR)、X 射线粉末衍射(XRD)和氮气物理吸附测量进行了表征。此外,标题化合物 3a-h 的结构也通过 1H、13C NMR、IR 和质谱得到了全面的阐明。