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78049511388
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For recent representative examples of catalytic asymmetric construction of a spirocenter, see
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For recent representative examples of catalytic asymmetric construction of a spirocenter, see
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19
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0037063544
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Teng, X.; Cefalo, D. R.; Schrock, R. R.; Hoveyda, A. H. J. Am. Chem. Soc. 2002, 124, 10779
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Fernández, I.; Hermatschweiler, R.; Breher, F.; Pregosin, P. S.; Veiros, L. F.; Calhorda, M. J. Angew. Chem., Int. Ed. 2006, 45, 6386 For an example of Pd-catalyzed C-allylation of phenols via an O-allylation-Claisen rearrangement sequence, see: Trost, B. M.; Toste, F. D. J. Am. Chem. Soc. 1998, 120, 815
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78049492037
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For examples of catalytic intramolecular Friedel-Crafts-type allylations using aromatic nucleophiles, see
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For examples of catalytic intramolecular Friedel-Crafts-type allylations using aromatic nucleophiles, see
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34
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78049495377
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1H NMR analysis of the crude reaction mixture
-
1H NMR analysis of the crude reaction mixture.
-
-
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39
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78049500870
-
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Base-promoted intramolecular alkylation of phenols to form spirocyclohexadienones is a classical transformation. See
-
Base-promoted intramolecular alkylation of phenols to form spirocyclohexadienones is a classical transformation. See
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41
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0343916681
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2 at room temperature in the absence of Pd catalyst. In contrast, 4a was obtained in good yield when an allyl bromide derivative corresponding to 3a was refluxed in t- BuOH in the presence of KO t -Bu
-
2 at room temperature in the absence of Pd catalyst. In contrast, 4a was obtained in good yield when an allyl bromide derivative corresponding to 3a was refluxed in t- BuOH in the presence of KO t -Bu
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(1965)
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Kropp, P.J.1
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78049500662
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There might be π-orbital interactions between the electron-deficient cationic π-allylpalladium unit and the electron-rich phenoxide ring in the transition states. Phosphorus ligands with π-acidic properties, such as triphenyl phosphite, could enhance the intramolecular charge transfer interaction, facilitating the carbon-carbon bond formation
-
There might be π-orbital interactions between the electron-deficient cationic π-allylpalladium unit and the electron-rich phenoxide ring in the transition states. Phosphorus ligands with π-acidic properties, such as triphenyl phosphite, could enhance the intramolecular charge transfer interaction, facilitating the carbon-carbon bond formation.
-
-
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43
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78049493555
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For reviews on catalytic asymmetric construction of quaternary stereocenters, see
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For reviews on catalytic asymmetric construction of quaternary stereocenters, see
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44
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0035905575
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78049519042
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For examples of asymmetric reactions using 10, see
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0034639986
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Trost, B. M.; Tsui, H.-C.; Toste, F. D. J. Am. Chem. Soc. 2000, 122, 3534
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78049488822
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3, the product was obtained in 88% yield (dr ratio = 9.2:1; ee: major diastereomer 87% ee, minor diastereomer 18% ee)
-
3, the product was obtained in 88% yield (dr ratio = 9.2:1; ee: major diastereomer 87% ee, minor diastereomer 18% ee).
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