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- W2007680113 abstract "Highly enantioselective Diels−Alder reactions of α-halo-α,β-unsaturated ketones with Lewis acid-activated chiral oxazaborolidine 1 are described. The reaction with α-fluoroenones provided the corresponding cyclohexane derivatives having a fluorinated quaternary stereogenic center with up to 99% de and 94% ee. The reaction with α-bromo cyclic enones provided the corresponding bromo bicyclic adducts with up to 99% de and 95% ee. A brominated cis-fused bicyclic adduct derived from 2-bromocyclopenten-1-one and Dane’s diene was converted to the trans-fused bicyclic system via reductive alkylation with the bulky aluminum reagent aluminum tris(2,6-diphenylphenoxide) (ATPH). With this process, formal syntheses of (+)-estrone and norgestrel have been demonstrated." @default.
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- W2007680113 date "2010-04-07" @default.
- W2007680113 modified "2023-09-26" @default.
- W2007680113 title "Stereoselective Construction of Halogenated Quaternary Stereogenic Centers via Catalytic Asymmetric Diels−Alder Reaction" @default.
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- W2007680113 doi "https://doi.org/10.1021/ja1018628" @default.
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