Table 3.

Scope of the Heteroarene Component^a

^aReaction conditions: substrate (0.5 mmol), 4, (0.05 mmol), HBF₄· OEt₂ (0.5 mmol), and 50% aq. H₂O₂ (1.0 mmol) in a mixture of CH₂Cl₂ (2.5 mL) and HFIP (0.5 mL) under air atmosphere. Entry 6: H₂SO₄ (0.5 mmol) was used in place of HBF₄·OEt₂. Entry 4: Reaction performed on 1.5 mmol scale.

^bIsolated yield.