Oxidation reactions of several furan derivatives as effective methods for the preparation of key synthetic intermediates are reviewed. Depending on the oxidizing reagent the furan ring can be considered as a C-1 or C-4 synthon, which upon different conditions leads to 1,4-dicarbonyl compounds, carboxylic acids, pyranones or butenolides.
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Merino et al. (2007) studied this question.