氮杂环卡宾(NHC)催化水杨醛与吡唑啉酮-4,5-二酮的[4+2]环加成反应高效构建螺缩酮-吡唑啉酮化合物
收稿日期: 2024-06-04
修回日期: 2024-07-10
网络出版日期: 2024-08-26
基金资助
石河子大学(2022ZK003); 石河子大学(RCZK202001); 新疆维吾尔自治区“天池英才”引进(CZ002737)
N-Heterocyclic Carbene-Catalyzed [4+2] Cycloaddition of Salicylaldehydes with Pyrazole-4,5-diones for the Synthesis of Spiroketal-Pyrazolones
Received date: 2024-06-04
Revised date: 2024-07-10
Online published: 2024-08-26
Supported by
Shihezi University(2022ZK003); Shihezi University(RCZK202001); Tianchi Talent Project of Xinjiang Uygur Autonomous Region(CZ002737)
利用氮杂环卡宾(NHC)催化水杨醛与吡唑啉酮-4,5-二酮的[4+2]环加成反应直接合成了缩醛的两个氧在同一环内的螺缩酮-吡唑酮化合物. 该反应的底物有很好的普适性, 并获得了中等到优异的产率(最高达到98%). 该方法反应条件温和, 操作简便, 为合成含吡唑啉酮的高官能团化的螺缩酮化合物提供了新的合成方法学. 此外, 克级反应和衍生化转化也能顺利进行.
关键词: 氮杂环卡宾; 环加成; 水杨醛; 吡唑啉酮-4,5-二酮; 螺缩酮-吡唑啉酮
王晓梅 , 刘岩 , 李师伍 , 赵志飞 . 氮杂环卡宾(NHC)催化水杨醛与吡唑啉酮-4,5-二酮的[4+2]环加成反应高效构建螺缩酮-吡唑啉酮化合物[J]. 有机化学, 2025 , 45(1) : 267 -275 . DOI: 10.6023/cjoc202406005
The first efficiently N-heterocyclic carbene-catalyzed [4+2] cycloaddition of salicylaldehydes and pyrazole-4,5- diones to directly synthesis of spiro-ketal-pyrazolones bearing both oxygens of the ketal unit in the same ring was disclosed. This reaction was qualified with broad substrate scope, achieving moderate to excellent yield (up to 98%). This method has mild reaction conditions and simple operation, providing a new attractive strategy for the practical syntheses of multi- functionalized spiroketals including pyrazolone structures with mild reaction condition and operational simplicity. Furthermore, the gram scale and derivative transformations have also been achieved.
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