triethylamine in N,N-dimethyl-formamide T=80 - 90°C; 2 h;

1: 100 percent / 2 h / 120 - 130 °C 2: diphenyl ether / 1 h / Heating 3: 90 percent / K2CO3 / dimethylformamide / 10 h / 80 - 90 °C 4: 90 percent / 2N NaOH / 2 h / Heating 5: 66 percent / 5 h / 130 - 140 °C 6: 89 percent / Et3N / dimethylformamide / 2 h / 80 - 90 °C View Scheme

1: 66 percent / 5 h / 130 - 140 °C 2: 89 percent / Et3N / dimethylformamide / 2 h / 80 - 90 °C View Scheme

1: 90 percent / 2N NaOH / 2 h / Heating 2: 66 percent / 5 h / 130 - 140 °C 3: 89 percent / Et3N / dimethylformamide / 2 h / 80 - 90 °C View Scheme

1: 2N NaOH / 2 h / Heating 2: 89 percent / Et3N / dimethylformamide / 2 h / 80 - 90 °C View Scheme

1: diphenyl ether / 1 h / Heating 2: 90 percent / K2CO3 / dimethylformamide / 10 h / 80 - 90 °C 3: 90 percent / 2N NaOH / 2 h / Heating 4: 66 percent / 5 h / 130 - 140 °C 5: 89 percent / Et3N / dimethylformamide / 2 h / 80 - 90 °C View Scheme

1: 90 percent / K2CO3 / dimethylformamide / 10 h / 80 - 90 °C 2: 90 percent / 2N NaOH / 2 h / Heating 3: 66 percent / 5 h / 130 - 140 °C 4: 89 percent / Et3N / dimethylformamide / 2 h / 80 - 90 °C View Scheme

1: K2CO3 / dimethylformamide / 2 h / 60 - 90 °C 2: 2N NaOH / 2 h / Heating 3: 89 percent / Et3N / dimethylformamide / 2 h / 80 - 90 °C View Scheme