Abstract
The first synthesis of a functionalized tricyclic skeleton of vinigrol is described. The key step involved an anionic oxy-Cope rearrangement of bicyclic allylic alcohol 18, readily prepared by highly stereoselective addition of vinyl magnesium chloride to the hydroxy enone 15b. Introduction of the tertiary hydroxy group at carbon 8a was achieved by an unexpected hydration of 30 with aqueous trifluoroacetic acid.
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