Table 1. Optimization of reaction conditions^a.

Entry	Variation	Yield (%)
1	None	72
2	NaDT instead of TBADT	56
3	Eosin Y	0
4	Mes-Acr-ClO4	0
5	Ir[dF(CF3)ppy2(dtbpy)]PF6	0
6	Benzophenone	45
7	390 nm instead of 365 nm	55
8	420 nm instead of 365 nm	47
9	1 mol% TBADT	45
10	5 mol% TBADT	62
11	Without TBADT	0
12	In the dark	0
13	Under air atmosphere	0

^aReaction conditions: 1a (0.20 mmol), 2a (2.0 mL), TBADT (2 mol%) at room temperature for 12 h under the irradiation of LED (365 nm, 6 W) under N₂ atmosphere. Isolated yield of 3a was given based on 1a.