in various solvent(s) T=120°C; 2 h;

1: 30 percent / 47percent hydrobromic acid, sulfuric acid / 4 h / 70 °C 2: sodium hydride / dimethylformamide / 48 h / Ambient temperature View Scheme

1: 90 percent / dimethylsulfoxide / 12 h / 110 °C 2: 30 percent / 47percent hydrobromic acid, sulfuric acid / 4 h / 70 °C 3: sodium hydride / dimethylformamide / 48 h / Ambient temperature View Scheme

sodium hydride in N,N-dimethyl-formamide 48 h; Ambient temperature;