Abstract
The (-)-sparteine-mediated enantioselective [2,3]-Wittig rearrangement of N,N-dialkyl-o-allyloxymethylbenzamides and o-substituted benzyl prenyl ethers has been investigated. With N,N-diethyl-o-allyloxymethylbenzamide, enantiomeric excess up to 60% was observed in pentane. These results suggest that the carbamoyl group can effectively assist the transfer of stereoinformation by coordinating with the (-)-sparteine-n-BuLi complex. Other functional groups (OMe, OCONR2, OMOM, F) were impotent to the enantiodifferentiation of this rearrangement.
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