tin(IV) chloride in dichloromethane T=-25°C; 2 h;

1: 1.) NaH/mineral oil / 1.) THF, 5 deg C, 15 min; 20 deg C, 15 min; reflux, 1 h; 2.) THF, 20 deg C, 1 h 2: 66 percent / SnCl4 / CH2Cl2 / 2 h / -25 °C View Scheme

1: 1.) NaH/mineral oil / 1.) THF, 5 deg C, 15 min; 20 deg C, 15 min; reflux, 1 h; 2.) THF, 20 deg C, 1 h 2: 66 percent / SnCl4 / CH2Cl2 / 2 h / -25 °C View Scheme