Table 1. Effect of Reaction Conditions.

entry	deviation from standard conditionsa	yield 3b
1	None	95 (90c)
2	EtOAc as the solvent	15
3	ACN as the solvent	52
4	1,4-dioxane as the solvent	85
5	MeOH as the solvent	90
6	DMSO as the solvent	41
7	green LED (525 nm), 3 h	37
8	green LED (525 nm), 18 h	90
9	under an O2 atmosphere	96
10	under a N2 atmosphere	3
11	in the dark	0
12	UV–CFL (370 nm), 3 h	34

^aStandard conditions: 1 (0.1 mmol), 2 (4 equiv) in MeOH/H₂O (2:1). 3 mL was irradiated for 3 h using a 440 nm 40 W LED under an ambient atmosphere.

^bDetermined by GC–FID using chlorobenzene as the internal standard.

^cIsolated yield.