acetic acid T=60°C;

1: 62 percent / TBAF / tetrahydrofuran / 0.25 h / 0 °C 2: 80 percent / aq. acetic acid / 2 h / 60 °C View Scheme

1.1: pyridine / CH2Cl2 / 0.5 h / 0 °C 1.2: 81 percent / ethyl(diisopropyl)amine / DMAP / CH2Cl2 / 24 h 2.1: 70 percent / Mo[N-(tBu)(3,5-dimethylphenyl)]3 / toluene / 20 h / 80 °C 3.1: 82 percent / hydrogen / Lindlar / CH2Cl2 / 5 h / 750.06 Torr 4.1: 62 percent / TBAF / tetrahydrofuran / 0.25 h / 0 °C 5.1: 80 percent / aq. acetic acid / 2 h / 60 °C View Scheme

1: 82 percent / hydrogen / Lindlar / CH2Cl2 / 5 h / 750.06 Torr 2: 62 percent / TBAF / tetrahydrofuran / 0.25 h / 0 °C 3: 80 percent / aq. acetic acid / 2 h / 60 °C View Scheme

1.1: 51 percent / aq. cerium ammonium nitrate / acetonitrile / 1 h 2.1: pyridine / CH2Cl2 / 0.5 h / 0 °C 2.2: 81 percent / ethyl(diisopropyl)amine / DMAP / CH2Cl2 / 24 h 3.1: 70 percent / Mo[N-(tBu)(3,5-dimethylphenyl)]3 / toluene / 20 h / 80 °C 4.1: 82 percent / hydrogen / Lindlar / CH2Cl2 / 5 h / 750.06 Torr 5.1: 62 percent / TBAF / tetrahydrofuran / 0.25 h / 0 °C 6.1: 80 percent / aq. acetic acid / 2 h / 60 °C View Scheme

1: 70 percent / Mo[N-(tBu)(3,5-dimethylphenyl)]3 / toluene / 20 h / 80 °C 2: 82 percent / hydrogen / Lindlar / CH2Cl2 / 5 h / 750.06 Torr 3: 62 percent / TBAF / tetrahydrofuran / 0.25 h / 0 °C 4: 80 percent / aq. acetic acid / 2 h / 60 °C View Scheme

1.1: pyridine / CH2Cl2 / 1 h / -20 °C 2.1: 74 percent / [15]crown-5 ether / tetrahydrofuran / 24 h / 20 °C 3.1: 51 percent / aq. cerium ammonium nitrate / acetonitrile / 1 h 4.1: pyridine / CH2Cl2 / 0.5 h / 0 °C 4.2: 81 percent / ethyl(diisopropyl)amine / DMAP / CH2Cl2 / 24 h 5.1: 70 percent / Mo[N-(tBu)(3,5-dimethylphenyl)]3 / toluene / 20 h / 80 °C 6.1: 82 percent / hydrogen / Lindlar / CH2Cl2 / 5 h / 750.06 Torr 7.1: 62 percent / TBAF / tetrahydrofuran / 0.25 h / 0 °C 8.1: 80 percent / aq. acetic acid / 2 h / 60 °C View Scheme

1.1: 74 percent / [15]crown-5 ether / tetrahydrofuran / 24 h / 20 °C 2.1: 51 percent / aq. cerium ammonium nitrate / acetonitrile / 1 h 3.1: pyridine / CH2Cl2 / 0.5 h / 0 °C 3.2: 81 percent / ethyl(diisopropyl)amine / DMAP / CH2Cl2 / 24 h 4.1: 70 percent / Mo[N-(tBu)(3,5-dimethylphenyl)]3 / toluene / 20 h / 80 °C 5.1: 82 percent / hydrogen / Lindlar / CH2Cl2 / 5 h / 750.06 Torr 6.1: 62 percent / TBAF / tetrahydrofuran / 0.25 h / 0 °C 7.1: 80 percent / aq. acetic acid / 2 h / 60 °C View Scheme

1: conc. HF / acetonitrile / 2 h / Ambient temperature 2: camphorsulfonic acid / 4 h / Ambient temperature 3: 71 percent / n-Bu4NF / dimethylsulfoxide; tetrahydrofuran / 0.5 h / Ambient temperature 4: 1) Ph3P, diethyl azodicarboxylate (DEAD) / 1) benzene, r.t., 5 min, 2) benzene, r.t., 2 h 5: 72 percent / aq. AcOH / 2 h / 60 °C View Scheme

1: 1) Ph3P, diethyl azodicarboxylate (DEAD) / 1) benzene, r.t., 5 min, 2) benzene, r.t., 2 h 2: 72 percent / aq. AcOH / 2 h / 60 °C View Scheme