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À propos de : Hydrogen-Bond-Promoted Hetero-Diels−Alder Reactions of UnactivatedKetones        

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  • Hydrogen-Bond-Promoted Hetero-Diels−Alder Reactions of UnactivatedKetones
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  • We report the first examples of hydrogen-bond-promoted acceleration of hetero-Diels−Alder reactions and the use of such catalysis for the hetero-Diels−Alder reactions of simple, unactivated ketones. Several spiro-fused dihydropyans were synthesized in good yields using this procedure. This activation protocol represents an attractive and operationally simple alternative to conventional, Lewis acid catalysis.
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