1.1: triethylamine / tetrahydrofuran / 6 h / Heating 2.1: 2.96 g / Lawesson's reagent / toluene / 5 h / 100 °C 3.1: Raney-Ni; water / ethanol / 1.5 h / Heating 3.2: 35 percent / hydrogen; glacial acetic acid / 10 percent Pd/C / methanol / 2 h / 50 °C / 15200 Torr View Scheme