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Enantioselective Intramolecular CH-Insertions upon Cu- Catalyzed Decomposition of Phenyliodonium Ylides
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1  Department of Organic Chemistry, University of Geneva 30, Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland

Abstract: The Cu-catalyzed intramolecular CH insertion of phenyliodonium ylide 5b has been investigated at 0 °C in the presence of several chiral ligands. Enantioselectivities vary in the range of 38–72 %, and are higherthan those resulting from reaction of the diazo compound 5c at 65 °C. The results are consistent with a carbenoid mechanism for Cu-catalyzed decomposition of phenyliodonium ylides.
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