1: With oxalyl dichloride; dimethyl sulfoxide in dichloromethane T=-70°C; 0.25 h; Inert atmosphereSchlenk technique; 2: With triethylamine in dichloromethane T=-60 - 20°C; 0.75 h; Inert atmosphere;

1,3-dibromo-5,5-dimethyl-hydantoin in dichloromethane Heating;

1: 85 percent / manganese dioxide / CH2Cl2 / 4 h / 20 °C 2: 87 percent / 1,3-dibromo-5,5-dimethylhydantoin / CH2Cl2 / Heating View Scheme

1: 90 percent / lithium aluminum hydride / tetrahydrofuran / 1 h / 20 °C 2: 85 percent / manganese dioxide / CH2Cl2 / 4 h / 20 °C 3: 87 percent / 1,3-dibromo-5,5-dimethylhydantoin / CH2Cl2 / Heating View Scheme