Spiroannulation by the [2,3]sigmatropic rearrangement via the cyclic allylsulfonium ylide. A stereoselective synthesis of (+)-acorenone B

A spiroannulation reaction using the [2,3]sigmatropic rearrangement via a cyclic allylsulfonium ylide was developed and applied to the synthesis of (+)-acorenone B starting from (–)-perillaldehyde.