A facile route to furan-3,4-dicarboxylic acid is described. Dimethylmaleic anhydride (1) on NBS-bromination followed by aqueous KOH treatment gave bis(hydroxymethyl)maleic anhydride (3), which on intramolecular Mitsunobu ring closure followed by esterification and DDQ-oxidation furnished the desired esters of furan-3,4-dicarboxylic acid 7a/b.
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Deshpande et al. (2002) studied this question.
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