4.6 Article

Visible-light-mediated direct C3-arylation of 2H-indazoles enabled by an electron-donor-acceptor complex

Journal

ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 17, Issue 45, Pages 9698-9702

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ob02074h

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Funding

  1. National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1A2C1008297]
  2. National Research Foundation of Korea (NRF) - Ministry of Education [2016R1D1A1B03931335]
  3. National Research Foundation of Korea [2016R1D1A1B03931335, 2019R1A2C1008297] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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A mild visible-light-mediated, photocatalyst-free arylation of 2H-indazoles was developed. The formation of an electron donor-acceptor complex by 2H-indazoles and aryl diazonium salts in the presence of pyridine allows the direct arylation of 2H-indazoles under visible-light irradiation. This process provides an efficient route for the synthesis of C3-arylated-2H-indazoles, which are important scaffolds of various bioactive compounds.

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