Chinese Journal of Organic Chemistry ›› 2025, Vol. 45 ›› Issue (3): 969-976.DOI: 10.6023/cjoc202409026 Previous Articles     Next Articles

ARTICLES

四环高原阿朴啡碱(+)-Crociflorinone及(+)-6a-epi-Crociflorinone的不对称全合成

杨帆a, 濮留洋b,*(), 谢建华a,*(), 周其林a   

  1. a 南开大学化学学院 元素有机化学国家重点实验室 有机新物质创造前沿科学中心 天津 300071
    b 南华大学化学化工学院 湖南衡阳 421001
  • 收稿日期:2024-09-20 修回日期:2024-10-29 发布日期:2024-12-05
  • 基金资助:
    国家自然科学基金(92256303); 国家自然科学基金(22221002); 国家自然科学基金(22188101)

Total Synthesis of Tetracyclic Homoproaporphine Alkaloids (+)-Crociflorinone and (+)-6a-epi-Crociflorinone

Fan Yanga, Liuyang Pub(), Jianhua Xiea(), Qilin Zhoua   

  1. a Frontiers Science Center for New Organic Matter, State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071
    b School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001
  • Received:2024-09-20 Revised:2024-10-29 Published:2024-12-05
  • Contact: * E-mail: puly@usc.edu.cn; jhxie@nankai.edu.cn
  • Supported by:
    National Natural Science Foundation of China(92256303); National Natural Science Foundation of China(22221002); National Natural Science Foundation of China(22188101)

Tetracyclic homoproaporphine alkaloids are a subset of isoquinoline alkaloids bearing a tetrahydroisoquinoline- fused spiro skeleton. Building on the successful enantioselective total synthesis of pentacyclic homoproaporphine alkaloids, this study utilizes chiral tricyclic cyclohexanone (–)-5 containing a quaternary carbon center as the starting material and develops a strategy involving Wittig reaction and Pictet-Spengler cyclization as the key steps to construct the chiral penta- cyclic skeleton containing a spiro structure and a quaternary carbon center. Subsequently, through late-stage functionalization including a tandem retro-oxa-Michael reaction/methylation, the first asymmetric total synthesis of tetracyclic homoproapor- phine alkaloid (+)-crociflorinone alongside its C6a epimer (+)-6a-epi-crociflorinone was achieved, thereby confirming their absolute configurations.

Key words: tetracyclic homoproaporphine alkaloids, asymmetric total synthesis, crociflorinone, Pictet-Spengler cyclization, isoquinoline alkaloids