copper; sodium hydride in N,N-dimethyl-formamide 1.) 30 min, 2.) 12 h, 100 deg C;

1: 72 percent / dimethylformamide / 2 h / Heating 2: 77 percent / 1.) NaH, Cu / dimethylformamide / 1.) 30 min, 2.) 12 h, 100 deg C View Scheme