Synthesis 2008(20): 3279-3288  
DOI: 10.1055/s-0028-1083165
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

gem-Dimethylcyclopropanation Using Triisopropylsulfoxonium ­Tetrafluoroborate: Scope and Limitations

Michael G. Edwards, Richard J. Paxton, David S. Pugh, Adrian C. Whitwood, Richard J. K. Taylor*
Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
Fax: +44(1904)434523; e-Mail: rjkt1@york.ac.uk;
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Publikationsverlauf

Received 13 June 2008
Publikationsdatum:
25. September 2008 (online)

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Abstract

A new nucleophilic isopropyl transfer reagent, triisopropylsulfoxonium tetrafluoroborate, has been prepared and evaluated. Thus, using this reagent and NaH in DMF, a range of electron deficient alkenes, including several chalcone analogues, α,β-unsaturated ketones, dienones and quinones, plus α,β-unsaturated esters, nitrile, sulfone and nitro examples, have been converted into the corresponding gem-dimethylcyclopropane compounds.