1: 87 percent / TFA / CHCl3 / 20 °C 2: 61 percent / SO3*pyridine; Et3N / CHCl3; dimethylsulfoxide / 1.5 h / 0 - 20 °C 3: 90 percent / Jones reagent / acetone / 0 - 20 °C 4: 99 percent / TFA / CHCl3 / 1 h / 20 °C 5: 80 percent / MnO2 / CHCl3 / 6 h / 20 °C 6: 87 percent / Ag2CO3 / CHCl3 / 48 h / 20 °C 7: 99 percent / H2 / Pd/C / methanol / 2 h / 20 °C View Scheme