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33745446917
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note
-
Catalytic hydrogenation attempts with Pd/C or Wilkinson's catalyst resulted in the hydrogenolysis of the allyl C-O bond.
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36
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37
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33745461627
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note
-
The stereochemistry of epoxide 7b was assigned on the assumption of a preferential attack of the epoxidating reagent from the α side of the molecule, opposite to the isopropyl chain, as it was proved in compounds 7a and 20. See also a discussion on the stereochemistry of compound 20 in the text.
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38
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33845283182
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40
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33745450936
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note
-
The reasons for the slow elimination of the TMS group in (iii) are not clear at the moment, but it may be due to a lack of coplanarity between the involved orbitals of the C-Si bond and the carbocation. This would permit successive rearrangements from (iii) to (v) that would relieve the angular strain associated with the spiranic carbon and would lead to a final carbocation (v) stabilized by the TMS and also by the neighboring alkoxide.
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42
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37049059959
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0003737513
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6 slows down the exchange of the hydroxyl proton so it gives a defined signal that can be irradiated in NOE experiments: Sanders, J. K. M.; Hunter, B. K. Modern NMR Spectroscopy; Oxford University: Oxford, 1989.
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45
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33745471402
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note
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For a description of the general experimental methods, see Supporting Information.
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