1: sodium hydride / dimethylformamide 2: 91 percent / H2O, dichlorodicyanoquinone / CH2Cl2 / 0.75 h / 20 °C 3: 1.2 g / pyridine / 12 h / 20 °C 4: sodium hydroxide / methanol / 0.25 h / Heating 5: M HCl / methanol / 0.67 h / Heating View Scheme