1: 85 percent / chlorosulfonic acid / 1 h / 0 °C 2: 79 percent / aq. ammonia / tetrahydrofuran / 1 h / 20 °C 3: 91 percent / KOH / methanol 4: 88 percent / pyridine / 2 h / 20 °C 5: 63 percent / sodium azide / dimethylformamide / 2 h / 40 °C 6: H2 / Pd/C / ethanol / 1 h / 20 °C 7: ethanol / 1 h / 20 °C 8: 2.30 g / H2 / ethanol / 2 h View Scheme

1: 85 percent / chlorosulfonic acid / 1 h / 0 °C 2: 79 percent / aq. ammonia / tetrahydrofuran / 1 h / 20 °C 3: 91 percent / KOH / methanol 4: 88 percent / pyridine / 2 h / 20 °C 5: 63 percent / sodium azide / dimethylformamide / 2 h / 40 °C 6: H2 / Pd/C / ethanol / 1 h / 20 °C View Scheme