Chinese Journal of Organic Chemistry ›› 2023, Vol. 43 ›› Issue (4): 1550-1558.DOI: 10.6023/cjoc202208016 Previous Articles     Next Articles

ARTICLES

利用连续流动技术合成(Z)-N-乙烯基取代N,O-缩醛

李靖鹏b, 黄顺桃b, 杨棋b, 李伟强b, 刘腾a,*(), 黄超b,*()   

  1. a 曲靖师范学院化学与环境科学学院 云南曲靖 655011
    b 云南民族大学化学与环境学院 生物基材料绿色制备技术国家地方联合工程研究中心 昆明 650500
  • 收稿日期:2022-08-15 修回日期:2022-09-30 发布日期:2022-11-21
  • 通讯作者: 刘腾, 黄超
  • 基金资助:
    国家自然科学基金(21662046); 国家自然科学基金(21202142); 云南省教育厅科研基金(2021Y667); 及云南地方高校科研基金(202101BA070001-049)

A Practical Synthesis of (Z)-N-Vinyl Substituted N,O-Acetals under Continuous Flow Technology

Jingpeng Lib, Shuntao Huangb, Qi Yangb, Weiqiang Lib, Teng Liua(), Chao Huangb()   

  1. a College of Chemistry and Environmental Science, Qujing Normal University, Qujing, Yunnan 655011
    b National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials, School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500
  • Received:2022-08-15 Revised:2022-09-30 Published:2022-11-21
  • Contact: Teng Liu, Chao Huang
  • Supported by:
    National Natural Science Foundation of China(21662046); National Natural Science Foundation of China(21202142); Scientific Research Fund of Yunnan Provincial Department of Education(2021Y667); Yunnan Local Colleges Research Projects of China(202101BA070001-049)

A novel, efficient and practical route to the preparation of (Z)-N-vinyl five-membered cyclic N,O-acetal derivatives utilized by continuous flow technology has been developed. The tandem cyclization reaction uses Schiff base imine as an intermediate, followed by the addition of hydroxyl group to alkynyl ester under the action of alkali, undergoing a unique intramolecular rearrangement to synthesize acetal derivatives. The whole cascade cyclization process generates a new C—O bond and C—N bond. In addition, the application of continuous flow technology can accurately control the three-component reaction pathway compared with traditional batch reaction, which can inhibit the generation of by-products between two components and provide a series of structurally diverse nitrogen- and oxygen-containing heterocycles in short time with high yields (81%~90%).

Key words: cyclic N,O-acetal, cascade cyclization reaction, control reaction pathway, continuous flow technology, three- component reaction