Table 1 Optimization of the reaction conditions^a.


Entry	Variation of standard conditions	Yield(%)^b
1	none	90
2	L2 instead of L1	70
3	L3 instead of L1	60
4	PC-2 instead of PC-1	Trace
5	MeCN as solvent	Trace
6	DCM as the solvent	ND
7	THF as the solvent	10
8	Cs₂CO₃ as base	32
9	No PC-1 or [Ni] or Ph₃P or light	ND

DMF N,N-dimethylformamide, ND not detected, Ni(COD)(DQ) cyclo-octa-1,5-diene(tetramethyl-1,4-benzoquinone)nickel.
^aStandard conditions: PC-1 (1 mol%), Ni(COD)(DQ) (3 mol%), L1 (5 mol%), 1a (0.2 mmol), 2a (0.3 mmol), Ph₃P (0.3 mmol), Na₂CO₃ (0.4 mmol), DMF (3.5 mL), blue LEDs, under air atmosphere at ambient temperature, 24 h.
^bIsolated yields.

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