Table 1. Optimization of reaction conditions^a.

Entry	Variation from the standard conditions	Yieldb
1	None	78%
2	PC1 instead of PC2	7%
3	4-CZIPN	71%
4	Et3N/KOtBu instead of pyridine	Trace
5	MTBE instead of THF	34%
6	DCM instead of MeCN	Trace
7	DMSO instead of MeCN	40%
8	DCE instead of MeCN	20%
9	THF instead of MeCN	71%
10	DIPEA instead of HCOOCs	N.D.
11	Cs2CO3 instead of HCOOCs	42%
12	In the absence of base	Trace
13	In the absence of PC	N.D.
14	In the dark	N.D.

^aUnless otherwise noted, all reactions were performed with 1 (0.25 mmol), 2 (0.10 mmol), NHC (0.23 mmol), pyridine (0.46 mmol), solvent A (1.5 mL), 15 min; then photocatalyst (0.002 mmol), base (0.2 mmol), solvent B (1.0 mL), blue LEDs at rt for 12 h.

^bYield determined by ¹⁹F NMR using PhCF₃ as an internal standard. N.D. = no detection.