1: TMSOTf / acetonitrile / 4 h / Ambient temperature 2: NaOMe / methanol / 1 h / Ambient temperature 3: 96 percent / pyridine / 2 h / Ambient temperature 4: 67 percent / pyridine / 1.5 h / Ambient temperature 5: 50 percent / Bu3SnH, AIBN / toluene / 2 h / Heating 6: 91 percent / pyridine / 2 h / Ambient temperature 7: 74 percent / NaN3 / dimethylformamide / 2 h / Heating 8: 71 percent / TsOH / methanol; CH2Cl2 / 0.5 h / Ambient temperature View Scheme