Table 1. Exploring the reaction conditions ^{a b} .

Entry	Variations from above conditions	Time	Conv. (%)	5a (%)	3a (%)	4a (%)
1	None	5 h	100	83	7	<5
2	Blue LED, No Ph3PAuCl	12 h	50	<10	Trace	33
3	LiBr instead of NaBr	12 h	100	78	8	<5
4	Acetone instead of ACN	5 h	100	11	37	<5
5	Ph3PAuNTf2 instead of Ph3PAuCl	5 h	100	68	10	7
6	Ph3PAuNTf2 and 20 mol% bpy	12 h	100	63	8	15
7	3 mol% Ph3PAuCl	5 h	100	81	7	<5
8	1 mol% Ph3PAuCl	5 h	100	63	13	9
9	No light (darkness)	5 h	100	76	8	<5

^aReaction conditions: 1 (0.1 mmol), NaBr (0.4 mmol), cat. Au (5 mol%) in acetonitrile (ACN), 50 °C.

^{b 19}F NMR yield with benzotrifluoride as the internal standard.