Entry Oxidant Solvent Temp. (oC) Yield (%)b
1 Ag2O DCE 130 37
2 AgOPiv DCE 130 44
3 AgO DCE 130 35
4 AgOPiv Dioxane 130 57
5 AgOPiv Toluene 130 50
6 AgOPiv EtOH 130 trace
7 AgOPiv Dioxane 110 68
8 AgOPiv Dioxane 100 76