1: 70 percent / H2O2, H2O, KF, KHCO3 / tetrahydrofuran; methanol / 0.33 h / Ambient temperature 2: 69 percent / Et3N, DMAP / CH2Cl2 / 48 h / Ambient temperature 3: 24 percent / PCl3, DMF, pyridine / tetrahydrofuran / 1 h / Ambient temperature 4: 67 percent / TBAF / tetrahydrofuran / 5 h / Ambient temperature View Scheme

potassium fluoride; water; dihydrogen peroxide; potassium hydrogencarbonate in tetrahydrofuran; methanol 0.333333 h; Ambient temperature;