Direct Arylation of Benzo[<i>b</i>]furan and Other Benzo-Fused Heterocycles.

For electron-withdrawing substituents a significant trend was observed: The yield decreases with increasing electron-withdrawing nature of the substituent (see trend for entries 5–10), which accounts for the low yield in the case of the 4-NO 2 substituent, for which the conversion was especially low, even though the 2-arylated product was formed exclusively (entry 10).

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