1: 35 percent / SnCl4 / acetonitrile 2: 70 percent / H2SO4 / acetonitrile; H2O / 18 h / 75 °C 3: 91 percent / pyridine / 30 h / Ambient temperature 4: 60 percent / NaI / 1,2-dimethoxy-ethane / 20 h / Heating 5: 85 percent / sodium methoxide / methanol / 4 h / Ambient temperature View Scheme

1: 35 percent / SnCl4 / acetonitrile 2: 70 percent / H2SO4 / acetonitrile; H2O / 18 h / 75 °C 3: 91 percent / pyridine / 30 h / Ambient temperature 4: 60 percent / NaI / 1,2-dimethoxy-ethane / 20 h / Heating View Scheme

Multi-step reaction with 2 steps 1: 93 percent / pyridine / CH2Cl2 / 24 h / Ambient temperature2: 100 percent / pyridine / 24 h / Ambient temperature