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Synlett 1991; 1991(4): 271-272
DOI: 10.1055/s-1991-20705
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Alkene Cyclopropanation with Sulfonium Ylids

Bernard Cimetière* , Marc Julia
  • *Laboratoire de Chimie de l'École Normale Supérieure, 24 rue Lhomond, F-75231 Paris Cedex 05, France
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Publikationsdatum:
07. März 2002 (online)

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The methylenation of alkenes with diphenylsulfonium methylide gives higher yields of cyclopropanes in the presence of a new copper catalyst, copper(II) 3-pentylacetylacetonate. An efficient synthesis of diphenylsulfonium methoxycarbonylmethylide, prepared from diphenylsulfonium methylide and methyl chloroformate, is described. This converts alkenes into cyclopropanecarboxylic esters.