Optimization of reaction conditions^a.

Entry	Deviation	Yieldb (%)
1	None	98
2	0.4 M DMF	26
3	0.25 M DMF	65
4	0.1 M DMF	96
5	0.1 M DMA	45
6	No light	Trace
7	Cook's conditionsc	6
8	White light	42
9	Green light	23
10	3 equiv. B2Pin2	Trace
11	3 equiv. B2(OH)4	Trace
12	3 equiv. B2(OH)4 + 3 equiv. catechol	63
13	1.5 equiv. B2Cat2	60

^aPerformed on 0.1 mmol scale (0.1 mmol 1) in 0.05 M solvent.

^bYields were determined using ¹H NMR analysis with 1,3,5-trimethoxybenzene (Ar–H) as internal standard.

^cPerformed with 0.1 mmol 1, 15 mol% Ni(hfacac)_2·xH₂O, 0.8 equiv. pyridine, 1.5 equiv. Zn and 1.2 equiv. MgCl₂, in 0.2 M DMA/THF (3/1), 16 h.¹³