Abstract A catalytic, practical, efficient procedure for the synthesis of 5-benzylidene-1,3-dimethylpyrimidine-2,4,6(1H,3H,5H)-trione and pyrano[2,3-d] pyrimidine diones at room temperature was developed using L-Proline nitrate ionic liquid under ultrasonic irradiation. The L-Proline nitrate is homogeneous and green catalyst easy to prepare by mixing L-Proline and nitric acid possess excellent catalytic activity under standard ultrasonic bath at room temperature for the synthesis of pyrimidine core. This adequate procedure offers some advantages like the use of green solvent H2O, environmentally green benign procedure, excellent yields, simple procedure, short reaction times, no need for column chromatographic separation and reusability of catalyst for five subsequent reaction. Graphical Abstract

中文翻译：

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L-脯氨酸基离子液体：一种用于合成5-亚苄基-1,3-二甲基嘧啶-2,4,6(1H,3H,5H)-三酮和吡喃并[2,3-d]嘧啶的高效均相催化剂超声波照射下的二酮

摘要 一种在室温下催化合成 5-亚苄基-1,3-二甲基嘧啶-2,4,6(1H,3H,5H)-三酮和吡喃并[2,3-d]嘧啶二酮的实用高效方法是在超声辐照下使用 L-脯氨酸硝酸盐离子液体开发的。L-脯氨酸硝酸盐是由L-脯氨酸和硝酸混合制备的均相绿色催化剂，在室温标准超声浴下对嘧啶核的合成具有优异的催化活性。这种充分的程序提供了一些优点，如使用绿色溶剂H2O，环境绿色良性程序，收率高，程序简单，反应时间短，不需要柱色谱分离和催化剂可重复用于五个后续反应。图形概要