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| Entry | Catalyst | Solvent | t (h) | Yield b (%) |
| 1 | PPh3AuCl/AgNTf2 | Toluene | 0.25 | 99 |
| 2 | AgNO3 | CH2Cl2 | 3.5 | 97 |
| 3 | AgNTf2 | CH2Cl2 | 5 | 99 |
| 4 | AgBF4 | CH2Cl2 | 3 | 97 |
| 5 | Ag2O | CH2Cl2 | >96 | 69 |
| 6 | Ag2CO3 | CH2Cl2 | 2 | 99 |
| 7 | TFA | CH2Cl2 | >24 | Traces |
| 8 | CuI | CH2Cl2 | >24 | Traces |
| 9 | PtCl2 | CH2Cl2 | >24 | Traces |
aReaction conditions: 0.10 mmol of 3a, 10 mol% of catalyst, solvent 0.5 mL, rt.
bYield of isolated 4a after flash chromatography.
