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Tetra-butylphosphonium arginine-based ionic liquid-promoted cyclization of 2-aminobenzonitrile with carbon dioxide

机译:四丁基phosph精氨酸基离子液体促进了二氧化碳对2-氨基苄腈的环化

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摘要

An easily prepared amino acid ionic liquid (AAIL) i.e. [TBP][Arg] comprising a tetra-butylphosphonium cation and an arginine anion was found to be an efficient and recyclable catalyst for the synthesis of quinazoline-2,4(1H,3H)-diones from 2-aminobenzonitriles and CO2 under solvent-free conditions. As a result, various 2-aminobenzonitriles bearing electron-withdrawing or electron-donating substituents worked well to afford quinazoline-2,4(1H,3H)-diones in excellent yields. Notably, this type of AAIL showed good stability, and could be easily recovered and reused five times without significant loss of its catalytic activity. This process represents an alternative approach for greener chemical fixation of CO2 to afford valuable compounds.
机译:发现容易制备的氨基酸离子液体(AAIL),即包含四丁基phosph阳离子和精氨酸阴离子的[TBP] [Arg]是合成喹唑啉-2,4(1H,3H)的有效且可回收的催化剂在无溶剂的条件下,由2-氨基苄腈和CO2生成二酮。结果,各种带有吸电子或供电子取代基的2-氨基苄腈可以很好地产生喹唑啉-2,4(1H,3H)-二酮。值得注意的是,这种类型的AAIL显示出良好的稳定性,并且可以容易地回收和重复使用五次,而不会明显丧失其催化活性。该过程代表了一种更绿色的化学固定二氧化碳以提供有价值的化合物的替代方法。

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