1: 1.) ozone, oxygen, 2.) dimethyl sulfide / 1.) CH2Cl2, 2.) 10 h 2: NaBH4 / methanol / 1 h / -40 °C 3: 93 percent / pyridine, 4-(N,N-dimethylamino)pyridine / 27 h 4: 50percent methanolic ammonia / 4 h 5: 67 percent / pyridine / 27 h 7: 97 percent / Lawesson's reagent / toluene / 1 h / Heating 8: 96 percent / W-2 Raney Ni / ethanol / 1 h / Heating 9: 63 percent / aq. MeNH2 / methanol / 46 h View Scheme