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- W2947079219 abstract "A concise synthetic method for dihydropyrans has been developed by inverse-electron-demand oxa-Diels-Alder reaction of α-keto-β,γ-unsaturated esters with α,β-unsaturated hydrazones as electron-rich olefins. This reaction is catalyzed by Eu(hfc)3 and proceeds in an endo-selective manner. This umpolung cycloaddition affords a variety of substituted dihydropyrans stereoselectively in high yields. In addition, indirect synthesis of formyl-substituted dihydropyran was achieved by dehydrazonation of the cycloadduct. This method is expected to be useful for the synthesis of dihydropyrans and tetrahydropyrans with unusual substitution patterns." @default.
- W2947079219 created "2019-06-07" @default.
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- W2947079219 date "2019-05-29" @default.
- W2947079219 modified "2023-09-24" @default.
- W2947079219 title "Inverse-Electron-Demand oxa-Diels–Alder Reactions of α-Keto-β,γ-unsaturated Esters and α,β-Unsaturated Hydrazones" @default.
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- W2947079219 doi "https://doi.org/10.1021/acs.orglett.9b01422" @default.
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