Mobile: The title reaction affords diastereomerically pure 3,4-disubstituted pyrrolidin-2-ones, which are important structural motifs in natural products, in good to high yields. Mechanistic investigations suggest the transformation proceeds through a tandem 1,3-acyloxy migration and a subsequent 1,5-acyloxy migration. DCE=1,2-dichloroethane, IPr=1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene.
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