Synthesis 2021; 53(20): 3815-3826
DOI: 10.1055/a-1509-8624
paper

Direct Approach to 3-Fluoroindoles and 3,3-Difluoroindolines from 2,2-Difluoro-2-phenylethan-1-amines via C–H/N–H Coupling

Authors

  • Lanfei Zhang

    a   Department of Chemistry, Shanghai University, 99 Shang Da Road, Shanghai 200444, P. R. of China
    b   State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, 555 Zu Chong Zhi Road, Shanghai 201203, P. R. of China
  • Xiaofei Zhang

    b   State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, 555 Zu Chong Zhi Road, Shanghai 201203, P. R. of China
  • Yongmei Cui

    a   Department of Chemistry, Shanghai University, 99 Shang Da Road, Shanghai 200444, P. R. of China
  • Chunhao Yang

    b   State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, 555 Zu Chong Zhi Road, Shanghai 201203, P. R. of China

This work was supported by grants from Science and Technology Commission of Shanghai Municipality (18431907100), and by the State Key Laboratory of Drug Research (SIMM193ZZ-03).


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Abstract

Herein, a direct method for the synthesis of 3-fluoroindoles and 3,3-difluoroindolines from easily accessible 2,2-difluoro-2-phenyl­ethan-1-amines is presented. This protocol was performed by Pd-catalyzed direct C–H/N–H coupling and employed picolinamide as a directing group. By controlling the temperature for this transformation, various 3,3-difluoroindolines and 3-fluoroindoles could be isolated with moderate to good yields.

Supporting Information



Publication History

Received: 21 April 2021

Accepted after revision: 17 May 2021

Accepted Manuscript online:
17 May 2021

Article published online:
15 June 2021

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