Oxonereg;; potassium carbonate in tetrahydrofuran; water Ambient temperature; Yield given;

1: 90 percent / NH4OH / CH2Cl2 / 2 h / 0 °C 2: 95 percent / Amberlyst 15 ion-exchange resin / tetrahydrofuran / 4 h / Heating 3: Oxone, K2CO3 / tetrahydrofuran; H2O / Ambient temperature View Scheme

1: 95 percent / Amberlyst 15 ion-exchange resin / tetrahydrofuran / 4 h / Heating 2: Oxone, K2CO3 / tetrahydrofuran; H2O / Ambient temperature View Scheme