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À propos de : Enantioselective Epoxidation of Alkenes Catalyzed by2-Fluoro-N-Carbethoxytropinone and Related TropinoneDerivatives        

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  • Enantioselective Epoxidation of Alkenes Catalyzed by2-Fluoro-N-Carbethoxytropinone and Related TropinoneDerivatives
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  • Several α-substituted N-carbethoxytropinones have been evaluated as catalysts for asymmetricepoxidation of alkenes with Oxone, via a dioxirane intermediate. α-Fluoro-N-carbethoxytropinone(2) has been studied in detail and is an efficient catalyst which does not suffer from Baeyer−Villiger decomposition and can be used in relatively low loadings. This ketone was prepared inenantiomerically pure form using chiral base desymmetrization of N-carbethoxytropinone. Asymmetric epoxidation catalyzed by 2 affords epoxides with up to 83% ee. Among other derivativestested, the α-acetoxy derivative 7 affords the highest enantioselectivities.
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