Scheme 4.
Scope of other heteroarenes. Conditions: 1 (0.5 mmol), 2 (1.5 mmol), CuSO4•5H2O (10 mol %), MeCN (1.0 mL), 85°C, 1 h, in air. Isolated yield. a NMR yield. b Using 6 equiv of 2 and 10 equiv of TBHP, 12h.
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