Alkene Cyclopropanation with Sulfonium Ylids
- 1 January 1991
- journal article
- letter
- Published by Georg Thieme Verlag KG in Synlett
- Vol. 1991 (04) , 271-272
- https://doi.org/10.1055/s-1991-20705
Abstract
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.Keywords
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