Abstract

Heterogeneous ordered mesoporous silica materials catalyst, MCM-41@Schiff base-Co(AcO)₂, reveals high catalytic performance within the synthesis of pyran derivatives using the multicomponent reaction of aldehydes, malononitrile and 2-naphthol (or cyclohexane-1,3-dione) in water. The reactions afforded the desired products in high yields (up to 97% and 95%). The substantial feature is that the mesoporous-complex catalyst could be easily separated from the reaction mixture by centrifugation and reused at least 6 times with more than 80% yield in activity. The gram-scale experiments were achieved with good yields and implied that the catalytic method was effective and convenient for heterocyclic synthesis. What is more, the synthesized catalyst was characterized using various spectroscopic techniques to obtain the structural and functional features. The analysis results confirmed that the Co-Schiff base complex immobilized on the surface of mesoporous materials MCM-41. Finally, a plausible reaction mechanism was proposed.

中文翻译：

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MCM-41 @席夫碱-Co（OAc）2作为合成吡喃衍生物的有效催化剂

摘要

非均相有序介孔二氧化硅材料催化剂，MCM-41 @席夫碱-Co（AcO）₂揭示了使用醛，丙二腈和2-萘酚（或环己烷-1,3-二酮）的多组分反应在吡喃衍生物的合成中具有较高的催化性能。反应以高收率（高达97％和95％）提供了所需产物。其主要特征在于，通过离心可以容易地将中孔配合物催化剂从反应混合物中分离出来，并重复使用至少6次，活性产率超过80％。克级实验获得了良好的收率，这表明该催化方法有效且方便地用于杂环合成。此外，使用各种光谱技术对合成的催化剂进行了表征，以获得结构和功能特征。分析结果证实Co-Schiff碱复合物固定在介孔材料MCM-41的表面上。最后，提出了合理的反应机理。