Table 1. Screening for optimal reaction conditions ^a .

Entry	TCICA (equiv.)	KF (equiv.)	Additive	Temp. (°C)	Yield (%)
1	2.0	—	—	rt	—
2	2.0	5.0	—	rt	29
3	2.0	5.0	0.1 TFA	rt	27
4	4.0	5.0	—	rt	49
5	6.0	5.0	—	rt	79
6	6.0	7.0	—	rt	81
7	6.0	3.0	—	rt	75
8	2.0	3.0	—	50	61
9	4.0	5.0	—	50	62
10	4.0	6.0	—	40	94
11	6.0	5.0	—	40	26 b

^aYields determined by ¹⁹F NMR using fluorobenzene as an internal standard.

^bMeCN not dry.