反应条件
1: sodium methylate / methanol / 1.5 h / 20 °C 2: phosphorus tribromide / tetrahydrofuran / 5.5 h / 0 - 20 °C 3: potassium carbonate / acetonitrile / 6 h / Reflux; Inert atmosphere 4: hydrogenchloride / methanol / 3.22 h / 3 - 9 °C 5: SnCl2·2H2O / methanol / 2 h / Reflux 6: acetic acid / 1 h / 90 °C 7: sodium hydroxide / methanol / 2 h / 90 °C 8: potassium carbonate / N,N-dimethyl-formamide / 4 h / 65 °C 9: ammonium formate / 5 palladium on charcoal / isopropyl alcohol; water / 17 h / 40 - 50 °C View Scheme