Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 35, Pages 10263-10266Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201505335
Keywords
arenes; boranes; fluorine; heterocycles; Lewis acids
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Funding
- ERATO from JST
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
- Astellas Foundation for Research on Metabolic Disorders
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Successful benzylic C(sp(3))-H trifluoromethylation, pentafluoroethylation, and heptafluoropropylation of six-membered heteroaromatic compounds were achieved as the first examples of a practical benzylic C(sp(3))-H perfluoroalkylation. In these reactions, BF2CnF2n+1 (n= 1-3) functioned as both a Lewis acid to activate the benzylic position and a CnF2n+1 (n= 1-3) source. The perfluoroalkylation proceeded at both terminal and internal positions of the alkyl chains. Perfluoroalkylated products were obtained in moderate to excellent yields, even on gram scale, and in a sequential procedure without isolation of the intermediates. By using this method, trifluoromethylation of a bioactive compound, as well as introduction of a CF3 group into a bioactive molecular skeleton, proceeded regioselectively.
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