1: K2CO3 / H2O; dioxane / 1.) room temperature, 6 h, 2.) reflux, 30 min 2: 570 mg / HgCl2, HgO / acetonitrile; H2O / 5 h / Heating 3: diethyl ether / 1 h / -5 °C 4: 580 mg / CrO3*Py / CH2Cl2 5: 6percent NaOH / H2O; dioxane / 6 h / Ambient temperature View Scheme

1: K2CO3 / H2O; dioxane / 1.) room temperature, 6 h, 2.) reflux, 30 min 2: 570 mg / HgCl2, HgO / acetonitrile; H2O / 5 h / Heating 3: diethyl ether / 1 h / -5 °C 4: 580 mg / CrO3*Py / CH2Cl2 View Scheme