1: 79 percent / LiAlH4 / tetrahydrofuran; CCl4 / 20 h / Heating 2: 88 percent / sodium propanethiolate / dimethylformamide / 3 h / Heating 3: 93 percent / imidazole / dimethylformamide / 3 h / ambient temperature 4: NaH / dimethylformamide / 0.03 h / 80 °C View Scheme

With  lithium aluminium tetrahydride in  tetrahydrofuran; tetrachloromethane 20 h;  Heating;