Acta Chimica Sinica ›› 2020, Vol. 78 ›› Issue (12): 1297-1308.DOI: 10.6023/A20070294 Previous Articles     Next Articles

Review

基于自由基机理的有机硼酯化反应

刘谦益a, 张雷a, 莫凡洋a,b   

  1. a 北京大学 工学院能源与资源工程系 北京 100871;
    b 江苏省东海县硅产业科技创新中心 连云港 222300
  • 投稿日期:2020-07-07 发布日期:2020-08-01
  • 通讯作者: 莫凡洋 E-mail:fmo@pku.edu.cn
  • 作者简介:刘谦益,北京大学工学院2017级博士生.本科毕业于北京大学工学院,博士阶段师从莫凡洋特聘研究员,主要从事有机自由基硼酯化和清洁高效有机合成方法学研究.
    张雷,北京大学工学院2016级博士生.2012-2016年于北京理工大学获得学士学位,2016年至今,在莫凡洋特聘研究员指导下攻读博士学位,主要从事有机电化学合成与过渡金属催化反应机理研究.
    莫凡洋,北京大学工学院特聘研究员、博士生导师.分别于2004年与2006年在北京理工大学获得学士与硕士学位(导师:周智明教授).2006至2010年就读于北京大学化学与分子工程学院,获得有机化学博士学位(导师:王剑波教授).2010至2012年在Scripps研究所从事博士后研究(导师:张庆海教授);2012至2015年在德克萨斯州大学奥斯汀分校从事博士后研究(导师:董广彬教授).2015年起担任北京大学工学院特聘研究员,主要研究方向包括资源导向的有机合成方法学、半导体氧化物的改性以及分子电子学.
  • 基金资助:
    项目受国家自然科学基金(Nos.21772003 and 21933001)资助.

Organic Borylation Reactions via Radical Mechanism

Liu Qianyia, Zhang Leia, Mo Fanyanga,b   

  1. a Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China;
    b Jiangsu Donghai Silicon Industry S&T Innovation Center, Lianyungang 222300, China
  • Received:2020-07-07 Published:2020-08-01
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Nos. 21772003 and 21933001).

Organoboronic acids and esters are highly valuable building blocks in cross-coupling reactions and practical intermediates of various functional group transformations. Additionally, organoboronic acids can be utilized directly as small molecule drugs. Therefore, development of efficient methods to synthesize organoboronic compounds is of significant importance. Traditional pathways to synthesize organoboronic compounds mainly rely on electrophilic borylation of organometallic reagent and transition-metal-catalyzed borylation. Radical intermediates have unique chemical properties which are quite different from those of polar intermediates resulted from the heterolysis of chemical bonds and those of the organometallic compounds during transition metal catalysis. As such, borylation based on radical mechanism possesses distinctive reaction process, substrate scope, reaction selectivity, etc., and have great potential in synthesis of organoboronic compounds. In 2010, the Wang's group first reported borylation via a radical mechanism. This method realized an efficient direct conversion of anilines into aryl organoboronic esters. Inspired by this innovative work, more and more borylation methods via radical intermediates have been reported and developed as new avenues for C-B bond formation in the past decade. A series of studies show that organoboronic acids and esters could be efficiently constructed by the reaction of aryl/alkyl radicals with diboron compounds. In this paper, we summarize the recent development of borylation reactions via radical mechanisms, including aryl and alkyl radical borylation. As for aryl radical borylation, the activation of substrates containing C-N, C-O, C-S, C-X (X=halogen) bonds and carboxylic acids to C-B bond is summarized respectively. As for alkyl radical borylation, the activation of substrates containing C-N, C-O, C-X (X=halogen), C-C bonds and carboxylic acids to C-B bond is summarized respectively. Finally, we provide a perspective on the future development direction of this research area.

Key words: radical chemistry, borylation reaction, diboron compounds, aryl radical, alkyl radical