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Fluorinated cantharidin analogues (4-7) have been synthesized for the first time. The key step in each synthesis is an exo-selective Diels-Alder reaction of furan with the appropriate fluorinated maleic anhydride. 17 O NMR measurements of 5-7 and the corresponding non-fluorinated parent compounds were undertaken to show the influence of the fluorine substituent(s) on the electronic properties...
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