1: AcOH / 2 h / 40 °C / Irradiation 2: 72 percent / aq. HCl / acetic acid / 4 h / 90 °C 3: OsO4; N-methylmorpholine N-oxide; pyridine / tetrahydrofuran; 2-methyl-propan-2-ol; H2O / 12 h 4: 91 mg / 1-hydroxy-1,2-benziodoxol-3(1H)-one 1-oxide / dimethylsulfoxide; tetrahydrofuran / 0.5 h 5: 132 mg / aq. KOH; air / tetrahydrofuran / 10 - 20 °C View Scheme