1: in methanesulfonic acid; trifluorormethanesulfonic acid T=100°C; 3 h; 2: With water in methanesulfonic acid; trifluorormethanesulfonic acid T=0 - 20°C; 0.5 h;

potassium carbonate in N,N-dimethyl-formamide 2 h; Ambient temperature;

1: 49 percent / CF3COOH / 24 h / 60 °C 2: 42 percent / K2CO3 / dimethylformamide / 2 h / Ambient temperature View Scheme