Optimization of reaction conditions.

Entry	Deviation from standard	Yielda (%)
1	None	62 (56b)
2	Ce(OTf)3 instead of CeCl3	16
3	KCl insetad of NaCl	42
4	NaOAc instead of Na3PO4	35
5	DBU instead of Cs2CO3	0
6	EtOAc instead of CH3CN	48
7	DMF instead of CH3CN	0
8	0.05 M instead of 0.1 M	43
9	0.2 M instead of 0.1 M	45
10	365 nm instead of 390 nm	11
11	427 nm instead of 390 nm	0
12	No CeCl3	12
13	No NaCl	30
14	No Na3PO4	0
15	No irradiation	0

^aYields were determined by ¹H NMR using 1,3,5-trimethoxybenzene as internal standard.

^bYield was based on isolation after chromatography. See ESI for reaction details.