1: 1.) oxalyl chloride, DMF / 1.) CH3CN, -15 deg C, 30 min; 2.) room temp., 6 h 2: 100 percent / KOH / ethanol / Ambient temperature View Scheme

oxalyl dichloride; N,N-dimethyl-formamide 1.) CH3CN, -15 deg C, 30 min; 2.) room temp., 6 h; Yield given. Multistep reaction;