Table 1.

Reaction optimization^a,b.

Entry	Photocatalysts	Solvent	Time (h)	Yieldb/%
1	Eosin Y	DMSO	15	64
2	Rose bengal	DMSO	12	72
3	Acridinium salt	DMSO	36	64
4	DCA	DMSO	15	NR
5	MB	DMSO	15	Trace
6	Ensin B	DMSO	24	61
7	Ru(bpy)3Cl2·6H2O	DMSO	36	62
8	fac-Ir(ppy)3	DMSO	36	56
9	Rose bengal	DMF	12	10
10	Rose bengal	MeCN	12	20
11	Rose bengal	MeOH	12	51
12	Rose bengal	CHCl3	12	Trace
13	Rose bengal	Acetone	12	55
14	Rose bengal	Toluene	12	NR
15	Rose bengal	EtOAc	12	15
16	Rose bengal	1,4-dioxane	12	22
17c	Rose bengal	DMSO	12	51
18	–	DMSO	12	NR
19d	Rose bengal	DMSO	12	NR

NR no reaction.

^aThe reactions were carried out with 1a (0.2 mmol), CF₂HSO₂Na 2 (0.4 mmol), photocatalyst (2 mol%) in 1 mL solvent under two 3 W green LEDs irradiation at room temperature.

^bIsolated yield.

^cThe photocatalyst loading was decreased to 1 mol%.

^dIn the dark.