1: 93 percent / pyridine, 4-(N,N-dimethylamino)pyridine / 27 h 2: 50percent methanolic ammonia / 4 h 3: 67 percent / pyridine / 27 h 5: 97 percent / Lawesson's reagent / toluene / 1 h / Heating 6: 96 percent / W-2 Raney Ni / ethanol / 1 h / Heating 7: 63 percent / aq. MeNH2 / methanol / 46 h View Scheme