1: NaBH4 / methanol / 1 h / -40 °C 2: 93 percent / pyridine, 4-(N,N-dimethylamino)pyridine / 27 h 3: 50percent methanolic ammonia / 4 h 4: 67 percent / pyridine / 27 h 6: 97 percent / Lawesson's reagent / toluene / 1 h / Heating 7: 96 percent / W-2 Raney Ni / ethanol / 1 h / Heating 8: 63 percent / aq. MeNH2 / methanol / 46 h View Scheme