催化学报 ›› 2016, Vol. 37 ›› Issue (2): 288-299.DOI: 10.1016/S1872-2067(15)60994-9

• 论文 • 上一篇    下一篇

金催化的环化反应与钯催化的炔醇偶联/环化反应相结合用于合成多取代呋喃衍生物:串联反应的应用范围

Chandrasekar Praveena, Paramasivan T. Perumalb   

  1. a 中央电化学研究所(科学与工业研究中心实验室)功能材料部, 卡莱科蒂 630003, 印度;
    b 中央皮革研究所(科学与工业研究中心实验室)有机化学部, 金奈 600020, 印度
  • 收稿日期:2015-09-09 修回日期:2015-10-12 出版日期:2016-01-30 发布日期:2016-01-31
  • 通讯作者: Chandrasekar Praveen
  • 基金资助:

    印度科学技术部.

Extrapolation of the gold-catalyzed cycloisomerization to the palladium-catalyzed cross-coupling/cycloisomerization of acetylenic alcohols for the synthesis of polysubstituted furans: Scope and application to tandem processes

Chandrasekar Praveena, Paramasivan T. Perumalb   

  1. a Functional Materials Division, Central Electrochemical Research Institute (CSIR Laboratory), Karaikudi 630003, India;
    b Organic Chemistry Division, Central Leather Research Institute (CSIR Laboratory), Adyar, Chennai 600020, India
  • Received:2015-09-09 Revised:2015-10-12 Online:2016-01-30 Published:2016-01-31
  • Supported by:

    This work was supported by the Department of Science and Technology (INSPIRE Faculty Program), India.

摘要:

开发了一种由金和钯催化π-活化由炔醇合成呋喃衍生物的集成方法. 该合成策略是最显著的特点适用于带环辛基的底物, 其适用范围比之前报道的有很大扩展. 在Sonogashira反应条件下, 由相应底物可直接得到环辛基呋喃. Pd在这些反应中起到2个重要作用: 底物发生偶联反应的关键催化剂; 通过π-活化促进炔醇中间体成环反应. 该方法在一步合成3-碘呋喃反应中作用很突出, 使通过偶联法进一步官能团化成为可能. 我们还将AuBr3用于多米诺成环/C-H键活化反应和无环前体的成环反应. 本文结果表明, 在该类成环反应中金和钯催化剂相辅相成.

关键词: 呋喃衍生物, 环化反应, 金催化, 钯催化, 一锅法, 串联反应

Abstract:

This paper describes the development of an integrated approach for the preparation of diverse furan derivatives from acetylenic alcohols by gold and palladium catalyzed π-activation chemistry. Notably, this new method was found to be amenable to cyclooctyl-containing substrates, which represents a significant extension to this methodology compared with our previous reports. Furthermore, this newly developed method allowed for the direct construction of cyclooctyl furans from their synthetic precursors under Sonogashira conditions. Experimental results revealed that palladium played two major functions in these reactions, including (1) an essential catalyst in the cross-coupling reaction of the substrates; and (2) facilitating the cyclization of the acetylenic alcohol intermediates through a typical π-activation process. The scope of this chemistry was highlighted by the one-pot synthesis of 3-iodofuran, which provided an opportunity for further functionalization (via coupling methods). Finally, the AuBr3 protocol was also elaborated to domino cyclization/C-H activation reactions, as well as the cyclization of acyclic precursors. Taken together, the results of this study demonstrate that gold and palladium catalysts can be used to complement each other in cyclization reactions.

Key words: Furan derivatives, Cycloisomerization, Gold catalysis, Palladium catalysis, One-pot operation, Tandem reactions