1: 88 percent / Bu3SnH, AIBN / benzene / 0.75 h / Heating 2: 94 percent / Lawesson's reagent / benzene / 1 h / Heating 3: ethanol / 0.25 h / Heating 4: potassium nitrosodisulfate, sodium dihydrogen phosphate / acetone; H2O 5: 72 percent / NH3 / CH2Cl2 / 96 h / Ambient temperature View Scheme