Table 3. Variation of Photocatalyst.

entry	photocataylst	yield of 2a	yield of 1a	exo:endo ratioa
1b	[Ru(bpy)3]Cl2	<5	86	N/A
2b	[Ru(bpz)3](PF6)2	<5	86	N/A
3c	Eosin Y (5 mol %)	22	48	3.7:1
4	Ir(Fppy)3	21	48	3.6:1
5	[Ir(py)2(dtbbpy)]PF6	11	71	2.3:1
6	[Ir{(dF(CF3)ppy)2(dtbbpy)}]PF6	17	58	2.9:1

^aReactions performed at a 0.231 mmol scale, at 5 °C with 1.0 mol % photocatalyst, 1.0 equiv of base, 20 equiv of NMM for 8 h unless otherwise stated. Calculated by UPLC (PDA).

^bReaction time of 10 h.

^cReaction time of 15 h.