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Carbonyl ylides to the fore: the first total synthesis of polygalolides A (1) and B (2) has been achieved by exploiting a tandem carbonyl ylide formation/1,3-dipolar cycloaddition to construct the unprecedented 5,10-dioxatricyclo[6.2.1.0]undecane core structure of these molecules in a single step.
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Nakamura et al. (2006) studied this question.
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