triethylamine in 1,4-dioxane; water T=25°C;

1: 1.) NaHSO3 / 1.) 5 deg C, overnight, 2.) ethyl acetate, water, room temp., 4 h 2: 90 percent / concentrated HCl / dioxane / 12 h / Heating 3: 73 percent / triethylamine / H2O; dioxane / 25 °C View Scheme

1: 90 percent / concentrated HCl / dioxane / 12 h / Heating 2: 73 percent / triethylamine / H2O; dioxane / 25 °C View Scheme

1: Diisobutylaluminum hydride / toluene / 0.1 h / -78 °C 2: 1.) NaHSO3 / 1.) 5 deg C, overnight, 2.) ethyl acetate, water, room temp., 4 h 3: 90 percent / concentrated HCl / dioxane / 12 h / Heating 4: 73 percent / triethylamine / H2O; dioxane / 25 °C View Scheme