caesium carbonate in N,N-dimethyl-formamide T=60°C;

1: 50 percent / iodine; potassium carbonate / dimethylformamide / 60 °C 2: 80 percent / phosphorus oxychloride / Heating 3: 90 percent / cesium carbonate / dimethylformamide / 60 °C View Scheme

1: 100 percent / acetic acid / Heating 2: 50 percent / iodine; potassium carbonate / dimethylformamide / 60 °C 3: 80 percent / phosphorus oxychloride / Heating 4: 90 percent / cesium carbonate / dimethylformamide / 60 °C View Scheme

1: 80 percent / phosphorus oxychloride / Heating 2: 90 percent / cesium carbonate / dimethylformamide / 60 °C View Scheme