Abstract
In this paper, we successively apply the "fluorous biphase system" (FBS) technique to the reactions of cyclopropyl aryl ketones with alpha-ketoacetic acids catalyzed by C8F17SO3H (30 mol%) using perfluorodecalin (C10F18, cis- and trans-mixture) and DCE as a co-solvent to give the corresponding products 5,6-dihydropyran-2-ones in good yields. Moreover, the reaction system can be performed for several times without reloading the catalyst and the fluorous solvent.
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