1: m-CPBA / CH2Cl2 / 0.5 h / 0 °C 2: 0.191 g / toluene / 1 h / Heating 3: 89 percent / HF*pyridine / tetrahydrofuran / 25 h / 20 °C 4: 75 percent / Pd(PPh3)2Cl2; CuI; Et3N / 3.5 h / 20 °C 5: 73 percent / TsNHNH2; NaOAc / 1,2-dimethoxy-ethane; H2O / 4 h / Heating 6: 57 percent / aq. HCl / methanol; tetrahydrofuran / 15 h / 20 °C View Scheme