[reactions: see text] Manganese(III)-mediated oxidative annulation of methylenecyclopropanes with 1,3-dicarbonyl compounds in acetic acid produces 4,5-dihydrofuran derivatives as [3+2] annulation products in moderate to good yields under mild conditions. The possible reaction mechanism is discussed on the basis of previous mechanistic investigation.
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Huang et al. (2005) studied this question.
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