有机化学 ›› 2023, Vol. 43 ›› Issue (4): 1517-1524.DOI: 10.6023/cjoc202209018 上一篇    下一篇

所属专题: 有机氟化学虚拟合辑

研究论文

可见光促进的含色氨酸寡肽与YlideFluor试剂的直接三氟甲基化反应研究

刘静a, 郝健a,*(), 沈其龙b,*()   

  1. a 上海大学化学系 上海 200444
    b 中国科学院上海有机化学研究所 有机氟化学重点实验室 上海 200032
  • 收稿日期:2022-09-14 修回日期:2022-11-14 发布日期:2022-11-21
  • 通讯作者: 郝健, 沈其龙
  • 基金资助:
    国家重点研发计划(2021YFF0701700)

Visible-Light-Promoted Direct Trifluoromethylation of Tryptophan-Containing Oligapeptides with YlideFluor

Jing Liua, Jian Haoa(), Qilong Shenb()   

  1. a Department of Chemistry, Shanghai University, Shanghai 200444
    b Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032
  • Received:2022-09-14 Revised:2022-11-14 Published:2022-11-21
  • Contact: Jian Hao, Qilong Shen
  • Supported by:
    National Key Research and Development Program of China(2021YFF0701700)

发展了一个温和条件下可见光促进的含色氨酸的寡肽与YlideFluor试剂的三氟甲基化反应. 初步的机理研究表明在反应过程中1,8-二氮杂二环[5.4.0]十一碳-7-烯(DBU)与YlideFluor试剂之间形成了一个供体-给体复合物, 在光照条件下, 该复合物被激发后分子中的硫-碳键发生均裂生成三氟甲基自由基, 该自由基进攻寡肽的色氨酸吲哚片段的2-位, 生成相应的三氟甲基修饰的寡肽.

关键词: 氟, 三氟甲基, 色氨酸, 寡肽, 可见光

A photosensitizer-free visible-light-promoted method for site-selective trifluoromethylation of tryptophan- containing oligopeptides using YlideFluor as the trifluoromethyl radical source under mild conditions was developed. Mechanistic studies showed that a donor-acceptor between 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and YlideFluor is generated. Upon irradiation with blue LEDs, the S—CF3 bond in the adduct undergoes homolytic cleavage to give trifluoromethyl radical, which attacks the electron-rich C-2 position of the indole moiety in the tryptophan-containing oligopeptide.

Key words: fluorine, trifluoromethyl, tryptophan, oligapeptide, visible light