Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 43, Pages 13270-13274Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201705964
Keywords
alpha-carbonyl cations; oxidative cyclization; rearrangement; sulfoxides; vinyl cations
Categories
Funding
- ERC [VINCAT CoG 682002]
- RWTH Aachen
- University of Vienna
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The selective, metal-free generation of alpha-carbonyl cations from simple internal alkynes was accomplished by the addition of a sulfoxide to a densely substituted vinyl cation. The high reactivity of the alpha-carbonyl cations was found to efficiently induce hydrogen and even carbon shift reactions with unusual selecivities. Complex compounds with highly congested tertiary and all-carbon-substituted quartenary carbon centers can thus be accessed in a single step from simple precursors. Mechanistic analysis strongly supports the intermediacy of the title compounds and provides a simple predictive scheme for the migratory aptitude of different substituents.
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