Table 1.

Reaction Optimization

entry	PG	Photocatalyst	R	Base	Yield(%)b
1	Tf	A	Bn	CS2CO3	50
2	Tf	A	Bn	K2CO3	54
3	Tf	A	Bn	K3PO4	58
4	Tf	B	Bn	K3PO4	65
5	Tf	A	tBu	quinuclidine	71
6	Tf	B	tBu	quinuclidine	77 c
7	COCF3	B	tBu	quinuclidine	0
g	Ts	B	tBu	quinuclidine	0
9	Ac	B	tBu	quinuclidine	0

^[a]1a (0.1 mmol), alkene (0.15 or 0.3 mmol), base (0.2 mmol), photocatalyst (2.0 mol%), DMF (0.2M), 34 W blue LED, ~ 40 °C, 16h.

^[b]Yields determined by ¹H NMR using trimethoxybenzene as an internal standard.

^[c]Yield of isolated product.

^[d]PG = protecting group; Tf = triflyl; Ts = tosyl; Ac = acetyl; DMF = dimethylformamide; Bn = benzyl; ^tBu = tert-butyl; Et = ethyl; Me = methyl.