Scheme 3. Scope of sp2 C–H carbonylation. Reaction conditions: 3 (0.3 mmol), Cu(OAc)2 (10 mol%), Ag2CO3 (2 eq.), Na2HPO4 (1 eq.), MeNO2 (0.5 mL), DMA (2 mL), 140 °C, 24 h. a165 °C, 48 h.
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