boron tribromide in dichloromethane T=-10°C; 0.5 h;

ammonia in methanol 96 h; Ambient temperature;

1: 71 percent / P4S10 / dioxane / 1 h / Heating 2: 70 mg / ethanol / 2 h / Heating 3: BF3*Et2O / 16 h / Ambient temperature 4: 87 percent / ammonia / methanol / 96 h / Ambient temperature View Scheme

1: 70 mg / ethanol / 2 h / Heating 2: BF3*Et2O / 16 h / Ambient temperature 3: 87 percent / ammonia / methanol / 96 h / Ambient temperature View Scheme

1: ammonia / methanol / Ambient temperature 2: 71 percent / P4S10 / dioxane / 1 h / Heating 3: 70 mg / ethanol / 2 h / Heating 4: BF3*Et2O / 16 h / Ambient temperature 5: 87 percent / ammonia / methanol / 96 h / Ambient temperature View Scheme