1: n-butylamine / dioxane / 1 h / 100 °C 2: 81 percent / K2CO3 / dioxane / 2 h / 120 °C 3: n-butylamine / dioxane / 1 h / 100 °C 4: 82 percent / K2CO3 / dioxane / 2 h / 120 °C 5: dimethylformamide / 3 h / 140 °C 6: 91 percent / K2CO3 / dioxane / 2 h / 120 °C View Scheme

1: n-butylamine / dioxane / 1 h / 100 °C 2: 89 percent / K2CO3 / dimethylformamide / 2 h / 140 °C View Scheme

N-butylamine in 1,4-dioxane T=100°C; 1 h;