Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202115272
Keywords
C-F bond activation; density functional calculations; HFIP; photoredox catalysis; alpha,alpha-difluoroketones
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Funding
- Indian Institute of Technology, Ropar
- SERB, DST, India [ECR/2018/000098]
- UGC, New Delhi
- IIT Ropar
- Deutsche Forschungsgemeinschaft [SPP1807]
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This study presents a novel visible light photoredox catalytic method for the selective cleavage of a single strong C-F bond in trifluoromethyl ketones. The reaction shows excellent chemoselectivity and functional group tolerance under mild conditions, and high-level DFT calculations are used to elucidate the mechanism.
A visible light photoredox catalytic method for the selective cleavage of single strong C-F bond in trifluoromethyl ketones is reported. Single electron reduction of trifluoromethyl ketones generates difluoromethyl radicals which can be engaged in intermolecular C-C bond formation with N-methyl-N-arylmethacrylamides to furnish fluorine-containing oxindole derivatives in good yields. The reaction shows excellent chemoselectivity with good functional group tolerance under mild conditions. 1,1,1,3,3,3-Hexafluoroisopropanol (HFIP) as a solvent plays a critical role for the selective single C-F bond cleavage. High-level DFT calculations are depicted to shed light on the mechanism.
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