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首页> 外文期刊>RSC Advances >Immobilization of phosphomolybdic acid nanoparticles on imidazole functionalized Fe3O4@SiO2: a novel and reusable nanocatalyst for one-pot synthesis of Biginelli-type 3,4-dihydropyrimidine-2-(1H)-ones/thiones under solvent-free conditions
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Immobilization of phosphomolybdic acid nanoparticles on imidazole functionalized Fe3O4@SiO2: a novel and reusable nanocatalyst for one-pot synthesis of Biginelli-type 3,4-dihydropyrimidine-2-(1H)-ones/thiones under solvent-free conditions

机译：磷钼酸纳米粒子在咪唑官能化的Fe3O4 @ SiO2上的固定化：一种新型且可重复使用的纳米催化剂，可在无溶剂条件下一锅合成Biginelli型3,4-二氢嘧啶-2-（1H）-酮/硫酮

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This article introduces Fe3O4@SiO2-imid-H3PMo12O40 nanoparticles as heterogenic catalyst for the synthesis of 3,4-dihydropyrimidinones under solvent-free condition. This reaction proceeds through acetoacetate esters and aldehyde derivatives followed by cyclisation with a urea to the dihydropyrimidinone. Excellent yields of dihydropyrimidinones are obtained within a short reaction time. The suggested method offers several advantages such as short reaction times, high yields, easy purification, a cleaner reaction and ease of recovery and reusability of the catalyst by a magnetic field. Also, the aforementioned nanocatalyst can be easily recovered by an external magnetic field and reused for subsequent reactions at least 5 times without noticeable deterioration in catalytic activity. Particle size distribution, surface area, magnetic properties and percent of leaching of H3PMo12O40 (PMA) after any reaction were investigated by dynamic light scattering (DLS), nitrogen physisorption method (BET) and Inductively Coupled Plasma (ICP) analyzer.
机译：本文介绍了Fe3O4 @ SiO2-imid-H3PMo12O40纳米颗粒作为非均相催化剂在无溶剂条件下合成3,4-二氢嘧啶酮的方法。该反应通过乙酰乙酸酯和醛衍生物进行，然后用脲环化成二氢嘧啶酮。在较短的反应时间内即可获得优异的二氢嘧啶酮收率。所提出的方法具有许多优点，例如反应时间短，产率高，易于纯化，反应更清洁以及易于通过磁场回收和再利用催化剂。另外，上述纳米催化剂可以通过外部磁场容易地回收，并且至少5次重复用于后续反应而不会引起催化活性的显着降低。通过动态光散射（DLS），氮物理吸附法（BET）和电感耦合等离子体（ICP）分析仪研究了任何反应后H3PMo12O40（PMA）的粒度分布，表面积，磁性和浸出百分比。

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