Acta Chimica Sinica ›› 2015, Vol. 73 ›› Issue (12): 1275-1282.DOI: 10.6023/A15060407 Previous Articles     Next Articles

Special Issue: 碳氢键官能团化


自由基促进的醇/醚α-O-C(sp3)-H键选择性活化的最新研究进展 2017 Awarded

尚筱洁a, 柳忠全b   

  1. a 甘肃农业大学资源与环境学院 兰州 730070;
    b 兰州大学功能有机分子化学国家重点实验室化学化工学院 兰州 730000
  • 投稿日期:2015-06-12 发布日期:2015-10-12
  • 通讯作者: 尚筱洁, 柳忠全;
  • 基金资助:


Recent Advances in Free-Radical-Promoted Selective Activation of Alcohol/Ether α-O-C(sp3)-H Bond

Shang Xiaojiea, Liu Zhongquanb   

  1. a College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China;
    b State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
  • Received:2015-06-12 Published:2015-10-12
  • Supported by:

    Project supported by the National Natural Science Foundation of China(Nos. 21272096 and 21472080).

Alcohols/ethers are the most common chemicals. And the hydroxyl group in alcohols is believed to be universal functional group in synthetic organic chemistry. It is undeniably attractive to form a new chemical bond through selective cleavage of the α-O-C(sp3)-H bond. Considerable developments in the free-radical-promoted alcohol/ether C(sp3)-H functionalization have been achieved in recent years. These methods have drawn much attention from synthetic chemists due to the features of alcohol/ether as starting materials, reservation of the hydroxyl group and excellent regioselectivity, etc. This paper summarizes the recent advances in free-radical-initiated selective activation of the α-O-C(sp3)-H bonds in alcohol/ether. For a start, the possible factors such as bond dissociation energy(BDE) and stability of the key radical intermediate that dominates the regioselectivity in radical-initiated C(sp3)-H bond activation have been analyzed here. Moreover, recent developments in this field have been demonstrated in details from different reaction types as following.(a) Minisci reactions of heterocycles with alcohols/ethers;(b) Radical addition/elimination reactions of activated alkenes with alcohols/ethers;(c) Free-radical addition/cyclization cascade reactions of activated olefins and/or biaryl isonitriles with alcohols/ethers;(d) Free-radical addition/difunctionalization and rearrangement reactions of alcohols/ethers with activated alkenes. Besides, other free radical reactions such as oxidative coupling reactions of aryl boronic acids with ethers, C-O and C-N bond formation reactions have also been exhibited. In addition, the suggested mechanisms for most of these reactions have been depicted and discussed in this review. Finally, the disadvantages of present systems and the possible modifications along with the future studies of this active area have been summarized at the end of this article.

Key words: free radical, alcohol, C-H activation, C-C bond formation, oxidative coupling