1: With diisobutylaluminium hydride in toluene T=-78°C; 1 h; 2: With methanol in toluene T=-78°C;

1: With oxalyl dichloride; dimethyl sulfoxide in dichloromethane T=-78°C; 0.5 h; 2: With triethylamine in dichloromethane T=-78 - 20°C;