Chinese Journal of Organic Chemistry Previous Articles     Next Articles

ARTICLE

四羟基二硼和硫酸铜共同促进的苯酞类化合物的简便合成

范飞飞a, 陈龙徽a, 王光伟a,*   

  1. a天津大学理学院,天津 30072
  • 收稿日期:2024-05-09 修回日期:2024-05-31
  • 基金资助:
    国家自然科学基金(No. 22271214)资助项目.

Tetrahydroxydiboron and Copper Sulfate Co-Promoted Facile Synthesis of Phthalides

Feifei Fana, Longhui Chena, Guangwei Wanga,*   

  1. aDepartment of Chemistry, School of Science, Tianjin University, Tianjin 300072
  • Received:2024-05-09 Revised:2024-05-31
  • Contact: * E-mail: wanggw@tju.edu.cn
  • Supported by:
    Natural Science Foundation of China (No. 22271214).

Transition-metal catalyzed cross-coupling is one of the basic strategies for the C-C bond formation. However, it is difficult to achieve satisfactory results when terminal alkynes with electron-withdrawing group such as propiolate esters are used. The reason behind this might be the easy polymerization of this type of alkynes in the presence of base. In this paper, we developed a tetrahydroxydiboron and copper sulfate co-promoted cross-coupling/cyclization of propiolate esters and o-iodobenzoic acid for the facile and efficient construction of phthalides. Preliminary mechanism study indicates that tetrahydroxydiboron can inhibit the polymerization of propiolate esters and increase the reaction rate. This method is characterized by high regio- and stereoselectivities, mild reaction conditions, short reaction time, broad substrate scope, and excellent functional group compatibility.

Key words: tetrahydroxydiboron, phthalides, copper sulfate, o-iodobenzoic acid, propiolate ester