Green synthesis of Ni-Cu-Zn ferrite nanoparticles using tragacanth gum and their use as an efficient catalyst for the synthesis of polyhydroquinoline derivatives
Thereupon, Ni‐Cu‐Zn ferrite nanoparticles as an efficientcatalyst was used for the synthesis of polyhydroquinoline derivatives via multi‐component reactions under microwave irradiation. Simple work‐up, mild reaction conditions, short reaction times, use of an economically convenient catalyst, and excellent product yields are the advantageous features of this method. The catalyst could easily be recycled
Ni 0.35 Cu 0.25 Zn 0.4 Fe 2 O 4MNPs是用黄aga胶作为生物模板,硝酸金属盐作为金属源的溶胶-凝胶法合成的。样品通过粉末X射线衍射(XRD),傅立叶变换红外光谱(FTIR),振动样品磁力计(VSM),扫描电子显微镜(SEM)和能量色散X射线分析(EDX)进行表征。纳米粒子在室温下表现出铁磁行为,饱和磁化强度为52.76 emu / g,矫顽力为80.14 Oe。因此,将Ni-Cu-Zn铁氧体纳米颗粒作为一种有效的催化剂,用于在微波辐射下通过多组分反应合成聚氢喹啉衍生物。后处理简单,反应条件温和,反应时间短,使用经济方便的催化剂,该方法的优点是产品质量高,产量高。该催化剂可以容易地再循环和再使用几次,而催化活性没有明显降低。
Magnetite Polycitric Acid (Fe3O4@PCA) Nanoparticles: A Novel, Efficient and Reusable Solid Acid Catalyst for the Preparation of Polyhydroquinolines
Background: Polyhydroquinoline derivatives are known as one of the most significant class
of biologically active heterocycles. Herein, in this paper, magnetite polycitric acid (Fe3O4@PCA)
nanoparticles as novel, efficient and reusable catalysts were used for the preparation of polyhydroquinoline
derivatives.
Method: Using aromatic and heteroaryl aldehydes with dimedone, ammonium acetate and ethyl acetoacetate,
polyhydroquinoline derivatives could be synthesized under solvent-free microwave irradiation
condition by Hantzsch multi-component reactions.
Results: Polyhydroquinoline derivatives were prepared under optimized reaction conditions in excellent
yield (97%). The reaction mechanism has been investigated.
Conclusion: This method has the advantages of short reaction times, use of an economically convenient
catalyst, and excellent product yields. Furthermore, the catalyst could be recycled and average
chemical yield for seven consecutive runs was 92%, without any significant reduction of activity.