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Paul W. Davies and Sébastien J.-C. Albrecht Gold- or Platinum-Catalyzed Synthesis of Sulfur Heterocycles: Access to Sulfur Ylides without Using Sacrificial Functionality Angewandte Chemie International Edition 48

Article first published online: 25 SEP 2009 | DOI: 10.1002/anie.200904309

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It′s no sacrifice: Alkynes have been used as direct precursors to sulfur ylides under gold or platinum π-acid catalysis in an atom-economic manner. An intramolecular redox reaction between an alkyne group with a tethered sulfoxide unit generates a sulfur ylide, which undergoes 2,3-sigmatropic rearrangement. Acyclic substrates are cycloisomerized to afford functionalized dihydrothiophenones (see scheme) and dihydrothiopyranones.

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