1: 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione / dimethyl sulfoxide / 20 °C 2: tetrahydrofuran / 2.25 h / 0 - 20 °C 3: pyridine / 20 °C 4: potassium tert-butylate / dimethyl sulfoxide / 5 h / 20 °C 5: methyl-magnesium iodide / diethyl ether / 0.17 h / 180 °C / |Inert atmosphere View Scheme

1: 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione / dimethyl sulfoxide / 20 °C 2: tetrahydrofuran / 2.25 h / 0 - 20 °C 3: pyridine / 20 °C 4: potassium tert-butylate / dimethyl sulfoxide / 5 h / 20 °C 5: methyl-magnesium iodide / diethyl ether / 0.17 h / 180 °C / |Inert atmosphere View Scheme