Preparation and characterization of Fe3O4@SiO2@PMA:AS an efficient and recyclable nanocatalyst for the synthesis of 1-amidoalkyl-2-naphthols
作者:Mohsen Esmaeilpour、Jaber Javidi、Maryam Zandi
DOI:10.1016/j.materresbull.2014.04.019
日期:2014.7
superparamagnetic Fe 3 O 4 @SiO 2 that is synthesized based on several stages. First of all, the Fe 3 O 4 @SiO 2 nanosphere core-shell is synthesized. Then, H 3 PMo 12 O 40 nanoparticles were synthesized by the treatment of H 3 PMo 12 O 40 with n -Octane as solvent by a solvothermal method and this nano hetero polyacid immobilized onto the imidazole functionalized Fe 3 O 4 @SiO 2 nanoparticles. The
摘要 在本文中,我们报道了一种基于多个阶段合成的功能化超顺磁性 Fe 3 O 4 @SiO 2 的制备方法。首先,合成了Fe 3 O 4 @SiO 2 纳米球核壳。然后,通过溶剂热法用正辛烷作为溶剂处理H 3 PMo 12 O 40 合成H 3 PMo 12 O 40 纳米颗粒,并将该纳米杂多酸固定在咪唑官能化的Fe 3 O 4 @SiO 2 纳米颗粒上。样品的结构通过XRD、TEM、DLS、FE-SEM、FT-IR、N 2 吸附-解吸等温线分析和VSM表征。此外,还描述了一种使用 β-萘酚、醛和乙酰胺的多组分、一锅缩合反应制备酰胺烷基萘酚的有效和直接的方案,在无溶剂和微波条件下,在 Fe 3 O 4 @SiO 2 -imid-PMA n 存在下苯甲酰胺和尿素。此外,纳米催化剂可以很容易地通过磁场回收并在接下来的反应中重复使用至少 5 次,而不会明显降低催化活性。
Magnetite (Fe3O4) nanoparticles-supported dodecylbenzenesulfonic acid as a highly efficient and green heterogeneous catalyst for the synthesis of substituted quinolines and 1-amidoalkyl-2-naphthol derivatives
The methodology provides a facile approach for the synthesis of targeted compounds with excellent isolated yields. Additionally, the catalyst can be recovered through external magnet and reused up to five reaction cycles with prominent reactivity. The present approach offers many advantages such as green and mild reaction condition, facilecatalystrecovery and excellent isolated yield of final products
摘要 磁性可回收磁铁矿(Fe 3 O 4)合成并通过不同的分析技术(如TEM,XRD,FTIR,TGA,SEM,EDX和VSM)对纳米颗粒负载的十二烷基苯磺酸(DDBSA @ MNP)进行了表征。通过一锅缩合反应,评估了合成的DDBSA @ MNP的催化效率,用于合成取代的喹啉和1-酰胺基-2-萘。该方法为合成目标化合物提供了简便的方法,具有优异的分离收率。另外,可以通过外部磁体回收催化剂,并以显着的反应性重复使用多达五个反应周期。本方法提供了许多优点,例如绿色和温和的反应条件,容易的催化剂回收以及优异的最终产物分离产率。 图形摘要
2-Hydroxy-5-sulfobenzoic acid: an efficient organocatalyst for the three-component synthesis of 1-amidoalkyl-2-naphthols and 3,4-disubstituted isoxazol-5(4H)-ones
(2-HSBA) efficiently catalyzed the one-pot three-component synthesis of a wide variety of 1-amidoalkyl-2-naphthols and 3,4-disubstituted isoxazol-5(4 H )-ones. The three-component process of substituted benzaldehydes, 2-naphthol, and amides (benzamide and acetamide) or urea occur using 10 mol% of 2-HSBA as an organocatalyst under solvent-free reaction conditions (SFRCs) at 100 °C. It was also found that
2-羟基-5-磺基苯甲酸(2-HSBA)有效催化多种1-酰胺基-2-萘和3,4-二取代异恶唑-5(4 H )-ones的一锅三组分合成 。在100°C无溶剂反应条件(SFRC)下,使用10 mol%的2-HSBA作为有机催化剂,发生了取代苯甲醛,2-萘酚和酰胺(苯甲酰胺和乙酰胺)或尿素的三组分过程。还发现在室温下在水性条件下使用15mol%的2-HSBA可获得制备3,4-二取代的异恶唑-5(4 H )-1的最佳结果 。反应很容易完成,在3–25分钟内(对于氨基烷基萘酚)和70–120分钟(对于3,4-二取代异恶唑-5(4 H )-ones),而预期产品的收率为82–97%。可以将催化剂回收并在模板反应中重复使用几次。该方法的优点是方便,操作程序简单,成本效益,不使用有害有机溶剂以及催化剂的商业可获得性。
β-Cyclodextrin-butane sulfonic acid: an efficient and reusable catalyst for the multicomponent synthesis of 1-amidoalkyl-2-naphthols under solvent-free conditions
A [small beta]-cyclodextrin-butane sulfonic acid is reported as an efficientcatalyst for the one-pot synthesis of 1-amidoalkyl-2-naphthols by the multicomponent condensation of aromatic aldehydes, [small beta]-naphthol and amides undersolvent-freeconditions. The...
Silica Supported Methanesulfonic Acid as an Efficient and Reusable Heterogeneous Catalyst for the Synthesis of Amidoalkyl Naphthols
作者:Min Wang、Yan Liang、Tingting Zhang、Jingjing Gao
DOI:10.1002/cjoc.201180296
日期:2011.8
amidoalkyl naphthols from three‐component one‐pot condensation of 2‐naphthol, aldehydes, amides or urea in the presence of silica supported methanesulfonic acid under thermal solvent‐free conditions has been described. The catalyst is stable, efficient, easily prepared, and reusable. The remarkable features of this methodology are short reaction time, excellent yields, simple experimental and work‐up procedures