Table 1.

Variation from optimized reaction conditions.

Entry	Variation from standard conditions	Yield [%][a]
1	none	51
2	no catalyst	0
3	10 mol% Pd(OAc)2 as catalyst	trace
4	10 mol% Pd(OAc)2/[HPtBu3][BF4] as catalyst	9
5	10 mol% Pd(PPh3)4 as catalyst	trace
6	10 mol% Cu2O as catalyst	10
7	10 mol% CuCl as catalyst	3
8	Et3N in place of DIPEA	7
9	no base	trace
10	addition of 10%-by-volume H2O	4
11	under SO2(g) (1 atm) in place of air	9

^[a]Yield determined versus 1,3,5-trimethoxybenzene as an internal standard.