1: 83 percent / diethyl ether / 0.17 h / 0 °C 2: 54 percent / N-methylimidazole / 0.5 h / 150 °C 3: 1.) CF3SO3SiMe3, 2.) NaOMe, MeOH / 1.) 1,2-dichloroethane, 15 min, reflux, 2.) 1,2-dichloroethane, 20 deg C, 1 h 4: 95 percent / pyridine / 0.17 h / Heating 5: 1.) SOCl2, 2.) NH3, methanol / 1.) reflux, 2 min, 2.) 20 deg C, 24 h View Scheme