A green, rapid, and efficient methodology is developed for the synthesis of 1‐phenyl‐3,5‐pyrazolidinedione (3) by the reaction of malonic acid with phenyl hydrazine in the presence of phosphorous oxychloride under solvent‐free conditions. The later compound 3 was used as a versatile precursor for green synthesis of chalcone derivatives (4a‐h) and spiroheterocyclic compounds (5a‐h) with good to excellent
开发了一种绿色,快速,有效的方法,用于在无溶剂条件下,通过
丙二酸与苯基
肼在
氯氧化
磷存在下的反应,来合成1-苯基-3,5-
吡唑烷二酮(3)。后来的化合物3用作绿色合成
查尔酮衍
生物(4a-h)和螺
杂环化合物(5a-h)的通用前体,具有良好的分离产率。在元素分析和光谱分析的基础上阐明了合成化合物的
化学结构。