Table 1.

Optimization of Reaction Conditions ^a.

Entry	[Rh]	[Ag]	Solvent	Yield (%) b
1	[Cp*RhCl2]2	AgBF4	DCE	13
2	Rh(PPh3)3Cl	AgBF4	DCE	0
3	Rh(COD)2(BF4)	AgBF4	DCE	0
4	/	AgBF4	DCE	0
5 c	[Cp*RhCl2]2	AgBF4	DCE	49
6 d	[Cp*RhCl2]2	AgBF4	DCE	72 (70) j
7 d	[Cp*RhCl2]2	AgSbF6	DCE	40
8 d	[Cp*RhCl2]2	AgOTf	DCE	23
9 d	[Cp*RhCl2]2	/	DCE	0
10 d	[Cp*RhCl2]2	AgBF4	THF	69
11 d	[Cp*RhCl2]2	AgBF4	Acetone	66
12 d,e	[Cp*RhCl2]2	AgBF4	DCE	49
13 d,f	[Cp*RhCl2]2	AgBF4	DCE	49
14 d,g	[Cp*RhCl2]2	AgBF4	DCE	67
15 d,h	[Cp*RhCl2]2	AgBF4	DCE	57
16 d,i	[Cp*RhCl2]2	AgBF4	DCE	0

^a Reaction conditions: 1a (0.2 mmol), 2a (0.2 mmol), Ag salt (0.2 mmol), solvent (2 mL), sealed tube under argon, 2 h. ^b NMR yield using CH₂Br₂ as internal standard. ^c solvent (5 mL). ^d solvent (10 mL). ^e HOAc (20 mol%) was added. ^f CsF (20 mol%) was added. ^g Zn(OAc)₂ (20 mol%) was added. ^h at 80 °C. ⁱ at 60 °C. ^j isolated yield. DCE: dichloroethane. THF: tetrahydrofuran.