Table 2.

Reaction scope ^a.

Entry	1	2	Condition	Yield (%) b
1			B	41
2			A	68
3			A	76
4			A	45
5			B	53
6			B	47
7			A	71
8			A	56

^a Condition A: 1 (0.4 mmol, 1.0 equiv), Cu₂O (10 mol%), BF₃·OEt₂ (40 mol%), DMF/NMP (2.0 mL, 9:1), 120 °C, under N₂ for 36 h. Condition B: 1 (0.4 mmol, 1.0 equiv), Cu₂O (20 mol%), BF₃·OEt₂ 20 mol%), DMF/NMP (3.0 mL, 9:1), 120 °C, under N₂ for 24 h. ^b Isolated yield.