1: 91 percent / TfOH / cyclohexane; CH2Cl2 / 0.5 h / Ambient temperature 2: 98 percent / TBAF / tetrahydrofuran / 1 h / Ambient temperature 3: 88 percent / PDC / dimethylformamide / 2 h / Ambient temperature 4: 62 percent / Jones' reagent / acetone / 0.75 h / 0 °C 5: 38 percent / Hg(OAc)2, AcOOH, AcOH / 3 h / Ambient temperature 6: benzenesulfonyl chloride, pyridine / 15 h / 0 °C 7: 92 percent / H2 / 10percent Pd/C / tetrahydrofuran / 15 h 8: DCC, DMAP / CH2Cl2; dimethylformamide / 1 h / Ambient temperature 9: H2 / 10percent Pd/C / tetrahydrofuran / 4 h / Ambient temperature 10: CH2Cl2 / 0.25 h / Ambient temperature View Scheme

1: 91 percent / TfOH / cyclohexane; CH2Cl2 / 0.5 h / Ambient temperature 2: 98 percent / TBAF / tetrahydrofuran / 1 h / Ambient temperature 3: 88 percent / PDC / dimethylformamide / 2 h / Ambient temperature 4: 62 percent / Jones' reagent / acetone / 0.75 h / 0 °C 5: 38 percent / Hg(OAc)2, AcOOH, AcOH / 3 h / Ambient temperature 6: benzenesulfonyl chloride, pyridine / 15 h / 0 °C 7: 92 percent / H2 / 10percent Pd/C / tetrahydrofuran / 15 h 8: DCC, DMAP / CH2Cl2; dimethylformamide / 1 h / Ambient temperature View Scheme