1.1: 57 percent / aq. HCl / tetrahydrofuran / 20 °C 2.1: 92 percent / camphor-10-sulfonic acid / 20 °C 3.1: pyridine / CH2Cl2 / 1 h / -20 °C 4.1: 74 percent / [15]crown-5 ether / tetrahydrofuran / 24 h / 20 °C 5.1: 51 percent / aq. cerium ammonium nitrate / acetonitrile / 1 h 6.1: pyridine / CH2Cl2 / 0.5 h / 0 °C 6.2: 81 percent / ethyl(diisopropyl)amine / DMAP / CH2Cl2 / 24 h 7.1: 70 percent / Mo[N-(tBu)(3,5-dimethylphenyl)]3 / toluene / 20 h / 80 °C 8.1: 82 percent / hydrogen / Lindlar / CH2Cl2 / 5 h / 750.06 Torr 9.1: 62 percent / TBAF / tetrahydrofuran / 0.25 h / 0 °C 10.1: 80 percent / aq. acetic acid / 2 h / 60 °C View Scheme

1: 57 percent / aq. HCl / tetrahydrofuran / 20 °C 2: 92 percent / camphor-10-sulfonic acid / 20 °C 3: pyridine / CH2Cl2 / 1 h / -20 °C 4: 45 mg / [15]crown-5 ether / tetrahydrofuran / 20 °C 5: 70 percent / Mo[N-(tBu)(3,5-dimethylphenyl)]3 / toluene / 20 h / 80 °C 6: 100 percent / hydrogen / Lindlar / CH2Cl2 7: 78 percent / aq. cerium ammonium nitrate / acetonitrile / 3 h View Scheme