Abstract
Optically active epoxides are prepared by the highly enantioselective epoxidation of benzylidenecyclobutanes using a glucose-derived ketone as the catalyst and oxone as the oxidant. A subsequent Lewis acid catalyzed rearrangement of the resulting epoxides with Et2AlCl or LiI provides α-aryl substituted cyclopentanones in high enantiomeric excess (see scheme; Tol= tolyl).
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