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Alcohol amine-catalyzed CO2 conversion for the synthesis of quinazoline-2,4-(1H,3H)-dione in water

机译:醇胺催化的CO 2转化用于合成喹唑啉-2,4-(1H,3H) - 二氧化乙醚

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The conversion of CO _(2) to high value-added chemicals in water using environment-friendly and cost-effective catalysts is a very significant topic. In this work, a green method for the conversion of CO _(2) catalyzed by alcohol amines has been developed. Alcohol amines showed considerable activating ability to CO _(2) in the cyclization with 2-aminobenzonitrile to quinazoline-2,4(1 H ,3 H )-dione in water. Notably, when diethanolamine (DEA) was used as the catalyst, 94% yield of quinazoline-2,4-(1 H ,3 H )-dione could be achieved. A plausible mechanism has been proposed based on the ~(1) H NMR, FT-IR analysis and DFT calculation. The excellent catalytic performance is attributed to the combined effect of both the secondary amine and hydroxyl groups on alcohol amines with the assistance of water in the formation of carbamate. Water plays a bi-functional role of solvent and co-catalyst in this catalytic process. Catalysts can be easily recovered and reused five times without significant loss of activity.
机译:使用环保和成本效益催化剂将CO _(2)转化为水中的高附加值化学品是非常重要的话题。在这项工作中,已经开发出由醇胺催化的CO _(2)转化的绿色方法。醇胺表明,在用2-氨基苄腈到喹唑啉-2,4(1h,3 H) - 在水中的喹唑啉-2,4(1 h,3 h) - 二氧化乙酮中,含有相当大的激活能力。值得注意的是,当使用二乙醇胺(DEA)作为催化剂时,可以实现94%的喹唑啉-2,4-(1 h,3 h)二酮的产率。已经提出了一种基于〜(1)H NMR,FT-IR分析和DFT计算的合理机制。优异的催化性能归因于仲胺对氨基甲酸氨基甲酸酯的辅助醇胺对醇胺的综合作用。在该催化过程中,水在溶剂和助催化剂中起双函数作用。催化剂可以容易地回收并重复使用五次而无需显着损失活性。

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