1: 53 percent / PDC / CH2Cl2 / 23 °C 2: 97 percent / BF3*Et2O / CH2Cl2 / 1.) 0 deg C, 2.) 23 deg C 3: 1.) NaH, 2.) HCl / 1.) reflux, 2.) H2O, MeOH, 23 deg C View Scheme

dipyridinium dichromate in dichloromethane T=25°C;

1: 53 percent / PDC / CH2Cl2 / 23 °C 2: 97 percent / BF3*Et2O / CH2Cl2 / 1.) 0 deg C, 2.) 23 deg C View Scheme