1: 71 percent / K2CO3 / H2O / 72 h / Ambient temperature 3: 85 percent / sodium bis(trimethylsilyl)amide / tetrahydrofuran; toluene / 0.5 h / Heating 4: 96 percent / HCl, KF, MeOH / CH2Cl2 / 2 h / Ambient temperature 5: 59 percent / H2O2, NaHCO3, H2O / methanol; tetrahydrofuran / 12 h / Heating View Scheme