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A general procedure was developed for the annelation of a butenolide to an enone that highlighted a manganese(III) oxidation of an enone. The merit of this procedure was illustrated in a synthesis of (-)-jolkinolide E,ent -1, from (+)-manool 11. A potassium permanganate-mediated degradation of 11 and dehydration of an intermediate β-hydroxyketone 12 according to a literature procedure afforded a...
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