In this study, the synthesis of pyrido[2,3-d:5,6-d′]dipyrimidines using CoFe₂O₄@SiO₂-PA-CC-guanidine-SA magnetic nanoparticles with excellent yields has been reported. Pyrido[2,3-d:5,6-d′]dipyrimidines were synthesized from the four-component reaction of barbituric acid derivatives, benzaldehyde derivatives and ammonium acetate in water at room temperature. The synthesized catalyst was identified using Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray powder diffraction (XRD), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM) techniques.

中文翻译：

---

使用CoFe2O4@SiO2-PA-CC-胍-SA磁性纳米粒子在水中一锅法合成吡啶并[2,3-d:5,6-d']双嘧啶

在这项研究中，报道了使用 CoFe ₂ O ₄ @SiO ₂ -PA-CC-胍-SA 磁性纳米粒子以优异的产率合成吡啶并[2,3-d:5,6-d']双嘧啶。由巴比妥酸衍生物、苯甲醛衍生物和乙酸铵在室温下在水中的四组分反应合成了吡啶并[2,3-d:5,6-d']双嘧啶。采用傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、能量色散X射线光谱（EDX）、X射线粉末衍射（XRD）、热重分析（TGA）和振动样品磁强计 (VSM) 技术。