Chinese Journal of Organic Chemistry ›› 2025, Vol. 45 ›› Issue (1): 267-275.DOI: 10.6023/cjoc202406005 Previous Articles     Next Articles

ARTICLES

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

王晓梅, 刘岩, 李师伍*(), 赵志飞*()   

  1. 石河子大学化学化工学院 化工绿色过程省部共建国家重点实验室培育基地 新疆石河子 832000
  • 收稿日期:2024-06-04 修回日期:2024-07-10 发布日期:2024-08-23
  • 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

Xiaomei Wang, Yan Liu, Shiwu Li(), Zhifei Zhao()   

  1. State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang 832000
  • Received:2024-06-04 Revised:2024-07-10 Published:2024-08-23
  • Contact: *E-mail: zhaozf@shzu.edu.cn; lishiwu@shzu.edu.cn
  • Supported by:
    Shihezi University(2022ZK003); Shihezi University(RCZK202001); Tianchi Talent Project of Xinjiang Uygur Autonomous Region(CZ002737)

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.

Key words: N-heterocyclic carbene, cycloaddition, salicylaldehyde, pyrazole-4,5-dione, spiro-ketal-pyrazolone