1: 80 percent / pyridine / 48 h / 20 °C 2: 66 percent / dimethylformamide / 24 h / 100 °C 3: 0.7 g / trifluoroacetic acid; aq. HCl / 24 h / 4 °C 4: NaBH4 / methanol / 2 h / 20 °C 5: 84 percent / imidazole; Ph3P; iodine / toluene / 3 h / Heating 6: 83 percent / K2CO3 / methanol; tetrahydrofuran / 1.5 h / 20 °C 7: 93 percent / ethanol / 3 h / 80 °C View Scheme