1: 91 percent / NaOH / tetrahydrofuran; H2O / 3 h / Heating 2: 88.8 percent / Br2, NaOAc / acetic acid / Ambient temperature 3: 80 percent / K2CO3 / acetonitrile / 75 °C 4: 75.7 percent / various solvent(s) / 2.5 h / 200 °C 5: 94.5 percent / n-BuLi / tetrahydrofuran / -65 °C 6: 23.53 g / PPA / 2 h / 85 - 90 °C 7: 62 percent / MnO2 / CH2Cl2; acetic acid / 5.5 h / -10 °C / other reagent, solvent, temperature, reaction time View Scheme