Abstract
Double, double, no toil and trouble: Enantiomerically pure tetrahydrofurans are obtained with high position- and stereoselectivity through a ruthenium(VII)-catalyzed oxidative cyclization of 5,6-dihydroxy alkenes (see scheme TPAP=tetrapropylammonium perruthenate). A dual activation modifies the reactivity and increases the carbophilicity of the transition metal so that an otherwise unusual dioxygenation with perruthenate occurs.
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