1: (NCO2Et)2, P(n-Bu)3 / toluene / -30 - 25 °C 2: aq. NaHCO3 / CH2Cl2 / 25 °C 3: silver triflate / CH2Cl2; toluene / 25 °C 4: Pb(ClO4)2 / acetonitrile / 25 °C 5: MeOH 6: 75 percent / Na-Hg/MeOH 7: N-chlorosuccinimide / pyridine / 25 °C 8: AgF / hexamethylphosphoric acid triamide / 70 °C 9: H2O / 5 °C View Scheme

1: (NCO2Et)2, P(n-Bu)3 / toluene / -30 - 25 °C 2: aq. NaHCO3 / CH2Cl2 / 25 °C 3: silver triflate / CH2Cl2; toluene / 25 °C 4: Pb(ClO4)2 / acetonitrile / 25 °C 5: MeOH 6: 75 percent / Na-Hg/MeOH View Scheme