1: 91 percent / NaOMe / methanol / 10 h / 5 - 20 °C / Irradiation 2: 89 percent / pyridine 3: 83 percent / acetolysis 4: 62 percent / tin(IV) chloride 5: 84 percent / deacylation 6: 49 percent / diphenylcarbonate, NaHCO3 / dimethylformamide / 0.42 h / 144 - 145 °C View Scheme

1: 91 percent / NaOMe / methanol / 10 h / 5 - 20 °C / Irradiation 2: 89 percent / pyridine 3: 83 percent / acetolysis 4: 62 percent / tin(IV) chloride 5: 84 percent / deacylation View Scheme