An improved synthetic access for the construction of 4,6,7-trimethylbenzofurans (B1–B8) through the one-electron oxidation of mesityl-substituted enols (E1–E8) is presented. The transformation can be accomplished in good to excellent yields by using various oxidants; i.e. tris(1,10-phenanthroline)iron(III) hexafluorophosphate, FeCl3, Ce(NH4)2(NO3)6, Cu(OTf)2/Cu2O or anodic oxidation.
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R�ck et al. (1994) studied this question.
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