Abstract
The addition of silyl enol ethers to cyclic enol ethers by zinc dibromide catalysed electrophilic addition of a phenylsulphenyl group has been shown to give exclusively the trans- diastereoisomer when the silyl enol ether of acetophenone is used. The same reaction was catalysed by a zinc(II) alkoxyamine complex, but the use of the chiral ligand (+)- cinchonine in this reaction did not result in any asymmetric induction.
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