1,8-diazabicyclo[5.4.0]undec-7-ene in dichloromethane T=-78 - 20°C; 10.25 h;

oxalyl dichloride; 1,8-diazabicyclo[5.4.0]undec-7-ene; triethylamine 1.) CH2Cl2, -78 deg C, 30 min; 2.) CH2Cl2, -78 deg C, 15 min, then --> room temp., 10 h; Yield given. Multistep reaction;