1: diethyl ether; dioxane / 16 h / Ambient temperature 2: NaH / dimethylformamide / 0.33 h / 50 °C 3: 29 percent / tetrahydrofuran; diethyl ether / 1 h / Ambient temperature View Scheme

in tetrahydrofuran; diethyl ether 1 h; Ambient temperature;