Table 1.

Evaluation of reaction parameters.

Entry	Catalyst[a]	Additive	Conversion[b]
1	PicAuCl2	None	43
2	PicAuCl2	MsOH (1 eq.)	71
3	PicAuCl2	TFA (1 eq.)	70
4	None	TFA (1 eq.)	none
5	PicAuCl2	p-NO2PhCO2H (1 eq.)	none
6	PicAuCl2	HNTf2 (1 eq.)	72
7	PicAuCl2	TFA (0.5 eq.)	54
8	AuCl	TFA (1 eq.)	33
9	AuCl3	TFA (1 eq.)	53
10	NHCAuNTf2	TFA (1 eq.)	36
11	PPh3AuNTf2	TFA (1 eq.)	36
12	PicAuCl2	TFA (1 eq.)[c]	89 (72)[d]

^[a]10 mol % of catalyst was used.

^[b]Determined by correlation between HPLC-MS and crude ¹H-NMR analysis using 3,5-dinitrobenzoic acid as internal standard.

^[c]The reaction mixture was heated at 40°C for 15h.

^[d]Isolated yield after column chromatography.