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DOI: 10.1055/s-0040-1720921
Visible-Light-Promoted Radical Cyclization of N-Arylvinylsulfonamides: Synthesis of CF3/CHF2/CH2CF3-Containing 1,3-Dihydrobenzo[c]isothiazole 2,2-Dioxide Derivatives


Abstract
A photocatalyzed and highly efficient trifluoromethylation of N-arylvinylsulfonamides using commercially available CF3SO2Cl as the trifluoromethyl radical source under blue LEDs is reported. The reaction proceeds through radical cyclization under mild conditions. An investigation of the substrate scope is performed to establish a general, synthetically useful protocol for the synthesis of novel trifluoromethylated 1,3-dihydrobenzo[c]isothiazole 2,2-dioxides in moderate to high yields. This method is also successfully applied for the synthesis of difluoromethylated and trifluoroethylated 1,3-dihydrobenzo[c]isothiazole 2,2-dioxides in good to excellent yields.
Key words
N-arylvinylsulfonamides - fluoro alkyl radicals - visible light - radical cyclization - 1,3-dihydrobenzo[c]isothiazole 2,2-dioxidesSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0040-1720921.
- Supporting Information
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Publication History
Received: 12 July 2021
Accepted after revision: 16 September 2021
Article published online:
26 October 2021
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