1: diethyl ether; dioxane / 16 h / Ambient temperature 2: NaH / dimethylformamide / 0.33 h / 50 °C 3: NaH / dimethylformamide / 0.33 h / 50 °C View Scheme

1: diethyl ether; dioxane / 16 h / Ambient temperature 2: NaH / dimethylformamide / 0.33 h / 50 °C 3: NaH / dimethylformamide / 0.33 h / 50 °C 4: NaBH4 / ethanol / 1 h / Ambient temperature 5: 26 percent / CH2Cl2 / 1 h / Heating View Scheme