Journal
ORGANIC CHEMISTRY FRONTIERS
Volume 5, Issue 10, Pages 1689-1697Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8qo00229k
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Funding
- National Natural Science Foundation of China [21572078, 21772062]
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A highly selective remote C-H trifluoromethylation of 8-aminoquinoline scaffolds in the C5-position with CF3SO2Na under visible light irradiation without an external photocatalyst has been developed. The protocol employs commercially available sodium trifluoromethanesulfinate (CF3SO2Na) as a trifluoromethylation reagent and shows a broad substrate scope, generating various 5-trifluoromethylated quinolines in good yields under photocatalyst-free, simple and mild conditions. Investigations indicated that both the starting material and product act as photosensitizers and O-1(2) coexists with O-2(-) during the reaction through energy transfer and single electron transfer processes. It is important to note that the electronic effect of the CF3 group as a substituent introduced into quinoline rings makes their trifluoromethylation more efficient under photo-irradiation from ultraviolet to visible light in the absence of an external photocatalyst.
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