1: CH3COONH4 / acetic acid / 4 h / Heating 2: AcOH / methanol / 24 h / 20 °C 3: POCl3 / pyridine / 0.25 h / Heating 4: 79.9 percent / H2SO4 / acetic acid / 3 h 5: 70.3 percent / H2 / Pd/C / ethanol / 8 h / 50 °C / 75.01 Torr 6: 70.5 percent / dichlorodicyanobenzoquinone; bis(trimethylsilyl)trifluoro acetamide / dioxane / 18 h / Heating View Scheme

1: CH3COONH4 / acetic acid / 4 h / Heating 2: AcOH / methanol / 24 h / 20 °C 3: POCl3 / pyridine / 0.25 h / Heating 4: 79.9 percent / H2SO4 / acetic acid / 3 h 5: 70.3 percent / H2 / Pd/C / ethanol / 8 h / 50 °C / 75.01 Torr View Scheme