1,8-diazabicyclo[5.4.0]undec-7-ene in tetrahydrofuran T=23°C; 6 h;

ammonium cerium(IV) nitrate; water in acetonitrile T=20°C; 2 h;

1: 74 percent / ammonium acetate; acetic acid / 2 h / Heating 2: 98 percent / ceric ammonium nitrate; water / acetonitrile / 2 h / 20 °C View Scheme

1: 64 percent / 4-dimethylaminopyridine; dicyclohexylcarbodiimide / CH2Cl2 / 8 h 2: 74 percent / ammonium acetate; acetic acid / 2 h / Heating 3: 98 percent / ceric ammonium nitrate; water / acetonitrile / 2 h / 20 °C View Scheme

sodium hydride in tetrahydrofuran 1.) 0 deg C, 30 min, 2.) -78 deg C to r.t.;