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首页> 外文期刊>RSC Advances >Magnetic Fe3O4@silica sulfuric acid nanoparticles promoted regioselective protection/deprotection of alcohols with dihydropyran under solvent-free conditions
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Magnetic Fe3O4@silica sulfuric acid nanoparticles promoted regioselective protection/deprotection of alcohols with dihydropyran under solvent-free conditions

机译：磁Fe3O4 @二氧化硅硫酸纳米粒子促进了溶剂条件下用二氢吡喃的醇促进醇的区域选择性/脱保护

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摘要

Protection (and deprotection) of hydroxyl groups via tetrahydropyranylation was carried out effectively using a catalytic amount of Fe3O4 supported silica sulphuric acid nanoparticles (Fe3O4@SiO2@SO3H) under solvent-free conditions. The synthesized nanocatalyst was characterized by XRD, TEM, FT-IR etc. A wide range of tetrahydropyranylated alcohol derivatives were synthesized using this heterogeneous magnetic nanocatalyst within 10-20 min with high yields. In addition, tetrahydropyranyl ethers could also be deprotected to the parent alcoholic compounds in the presence of MeOH using the same catalyst. After completion of the reactions, the catalyst was easily separated from the reaction medium using an external magnet, which ameliorated the overall synthetic process. The catalyst was recovered and reused for five successive reactions without any appreciable loss in its activity. Mild reactions conditions, operational simplicity, solvent free conditions, high selectivity, easy recyclability of the magnetic nanocatalyst, and high yields can be considered as the advantageous features of our procedure.
机译：在无溶剂条件下，在无溶剂条件下，使用四氢吡喃化通过四氢吡喃化化的保护（和脱保护）通过催化量的Fe 3 O 4负载的二氧化硅硫酸纳米颗粒（Fe3O4 / SiO 2 @ SO 3）进行。合成的纳米催化剂的特征在于XRD，TEM，FT-IR等。在10-20分钟内，在10-20分钟内使用该非均相磁性纳米催化剂合成各种四氢吡喃基化醇衍生物。此外，使用相同的催化剂，还可以在MeOH存在下剥离到母体酒精化合物中的四氢吡喃基化合物。在完成反应后，使用外部磁铁容易地将催化剂与反应介质分离，这改善了整体合成方法。回收催化剂并重复使用5个连续反应，而不具有任何明显的活性损失。轻度反应条件，操作简单性，无溶剂的条件，高选择性，磁性纳米催化剂的容易再循环性，高产率可以被认为是我们手术的有利特征。

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  • 来源
    《RSC Advances》 |2017年第89期|共7页
  • 作者

    Rajkumari Kalyani; Kalita Juri; Das Diparjun; Rokhum Lalthazuala;

  • 作者单位

    Natl Inst Technol Dept Chem Silchar 788010 Assam India;

    Natl Inst Technol Dept Chem Silchar 788010 Assam India;

    Natl Inst Technol Dept Chem Silchar 788010 Assam India;

    Natl Inst Technol Dept Chem Silchar 788010 Assam India;

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  • 正文语种 eng
  • 中图分类 化学;
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