1: 94 percent / BF3*OEt2 / CH2Cl2 / 1 h / 0 °C 2: m-CPBA / CH2Cl2 / 0.08 h / -78 °C 3: 74 percent / trifluoromethanesulfonic anhydride / CH2Cl2 / 5 h / -78 - -40 °C 4: 85 percent / H2; CF3COOH / Pd/C / ethyl acetate; methanol / 12 h / 2585.81 Torr View Scheme

1: BF3*Et2O / 1,2-dichloro-ethane / 1 h / -15 °C 2: H2 / 10percent Pd/C / ethyl acetate / 2 h / Ambient temperature View Scheme