Table 1.

Optimization of the reaction conditions^a.

Entry	Variation from standard conditions	Yieldb (%)
1	No deviation	>96 (96c)
2	Pd(PPh3)2Cl2 instead of Pd(PPh3)4	4
3	Pd(PPh3)2Cl2/XantPhos (1:2) instead of Pd(PPh3)4	7
4	Pd(PPh3)2Cl2/PPh3 (1:2) instead of Pd(PPh3)4	>96
5	with the addition of Xantphos or DPEPhos (10 mol %) as ligand	0, 8
6	t-BuBr instead of 2a	93d
7	CyI instead of 2a	87d,e
8	At 100 oC, in the absence of light irradiation	0
9	Without Pd(PPh3)4 or K2CO3 or light irradiation	0

^aReaction conditions: 1a (0.1 mmol), 2a (0.15 mmol), Pd(PPh₃)₄ (5 mol %), K₂CO₃ (0.2 mmol), and DMA [0.1 M] under 40 W blue LED irradiation with fan cooling (30 ± 5 °C).

^bGC yields using dodecane as an internal standard, unless otherwise noted.

^cIsolated yield. E:Z > 20:1.

^dNMR yields using 1,1,2,2-tetrachloroethane as an internal standard. E:Z > 20:1.

^eYield of the cyclohexyl-substituted product.