In the present study, we report the synthesis of various quinoxaline derivatives from direct condensation of substituted aromatic 1,2-diamine with 1,2-dicarbonyl catalyzed by nanostructured pyrophosphate Na2PdP2O7 as a new highly efficient bifunctionalheterogeneous catalyst. The quinoxaline synthesis was performed in ethanol as a green and suitable solvent at ambient temperature to afford the desired quinoxalines with good to excellent yields in shorter reaction times. Many Quinoxaline derivatives were successfully synthesized using various 1,2-diketones and 1,2-diamines at room temperature. Catalyst reusability showed that the Na2PdP2O7 catalyst exhibited excellent recyclability without significant loss in its catalytic activity after five consecutive cycles.

中文翻译：

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使用纳米结构焦磷酸盐Na2PdP2O7作为新型，高效且可重复使用的非均相催化剂，采用环保方法获得喹喔啉衍生物。

在本研究中，我们报道了由纳米结构的焦磷酸盐Na2PdP2O7催化的取代芳族1,2-二胺与1,2-二羰基的直接缩合反应合成的各种喹喔啉衍生物，这是一种新型的高效双功能多相催化剂。喹喔啉的合成是在环境温度下以乙醇作为绿色和合适的溶剂在乙醇中进行的，从而以较短的反应时间以良好或优异的产率提供了所需的喹喔啉。在室温下，使用各种1,2-二酮和1,2-二胺成功合成了许多喹喔啉衍生物。催化剂的可重复使用性表明，Na2PdP2O7催化剂在连续五个循环后显示出极好的可再循环性，而催化活性却没有显着降低。