1.1: 2,6-lutidine / CH2Cl2 / 0.5 h / -78 °C 2.1: 0.85 g / 2,6-lutidine / CH2Cl2 / 1.5 h / cooling 3.1: i-Pr2NH; BuLi / tetrahydrofuran; hexane / 0.33 h / -78 °C 3.2: 54 percent / tetrahydrofuran; hexane; hexamethylphosphoric acid triamide / 19 h 4.1: m-CPBA / CH2Cl2 / 0.5 h / 0 °C 5.1: 0.191 g / toluene / 1 h / Heating 6.1: 89 percent / HF*pyridine / tetrahydrofuran / 25 h / 20 °C 7.1: 75 percent / Pd(PPh3)2Cl2; CuI; Et3N / 3.5 h / 20 °C 8.1: 73 percent / TsNHNH2; NaOAc / 1,2-dimethoxy-ethane; H2O / 4 h / Heating 9.1: 57 percent / aq. HCl / methanol; tetrahydrofuran / 15 h / 20 °C View Scheme