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