Table 1.

Selected examples of reaction optimization highlighting the influence of key reaction parameters.^[a]

Entry	Variations	Yield[b] [%]
1	–	95
2	Fe(OTf)2 instead of Cu(OTf)2	15
3	NiCl2(DME) instead of Cu(OTf)2	0
4	L1 instead of dtbbpy	22
5	C6F5‐ZnCl + 1 equiv. diglyme instead of (diglyme)Zn(C6F5)2	23
6	4CzIPN instead of Ir(dfppy)2(ppy)	93 (85[c])
7	No radiation or no photocatalyst	0
8	4CzIPN instead of Ir(dfppy)2(ppy), no Cu(OTf)2	0

[a] Reaction conditions: 0.1 mmol a1, 0.1 mmol b1 and other additives in 0.5 mL EtOAc. Reaction under Blue LED for 20 h. [b] GC yield with mesitylene as internal standard. [c] Isolated yield.