1: 61 percent / diphenyl ether / 0.5 h / Heating 2: 1.) N,N-dimethylformamide, potassium carbonate / 1.) 90 deg C, 30 min, 2.) 90 deg C, 16 h View Scheme

1: 61 percent / diphenyl ether / 0.5 h / Heating 2: 1.) N,N-dimethylformamide, potassium carbonate / 1.) 90 deg C, 30 min, 2.) 90 deg C, 16 h View Scheme

potassium carbonate; N,N-dimethyl-formamide 1.) 90 deg C, 30 min, 2.) 90 deg C, 16 h; Yield given. Multistep reaction;