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Direct arylation of heterocycles through C-H bond cleavage using metal-organic-framework Cu-2(OBA)(2)( BPY) as an efficient heterogeneous catalyst

机译:通过金属-有机骨架Cu-2(OBA)(2)(BPY)作为有效的多相催化剂,通过C-H键裂解直接杂环杂环芳基化

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摘要

A crystalline porous metal-organic-framework Cu-2(OBA)(2)(BPY) was synthesized and characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR), atomic absorption spectrophotometry (AAS), and nitrogen physisorption measurements. The Cu-MOF was shown to be an efficient heterogeneous catalyst for direct C-arylation of a variety of heterocycles by iodoarenes. The optimal conditions employed tBuOLi in dioxane at elevated temperature. In addition, a leaching test was also conducted to investigate the heterogeneity. Gratifyingly, the MOF catalyst can be facilely recycled several times under identical conditions without remarkable loss in catalytic reactivity.
机译:合成了晶体多孔金属有机骨架Cu-2(OBA)(2)(BPY)并通过X射线粉末衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM),热重分析进行了表征(TGA),傅立叶变换红外(FT-IR),原子吸收分光光度法(AAS)和氮物理吸收测量。 Cu-MOF被证明是一种有效的多相催化剂,可通过碘代芳烃直接对各种杂环进行C-芳基化。最佳条件是在高温下在二恶烷中使用tBuOLi。另外,还进行了浸出试验以研究异质性。令人欣慰的是,MOF催化剂可以在相同的条件下方便地循环使用几次,而不会明显降低催化反应活性。

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