1: 60 percent / PCC / CH2Cl2 2: Et3N / 12 h / Ambient temperature 3: 80 percent / 75-80percent MCPBA / CH2Cl2 / 18 h 4: 60 percent / Py / 3 h 5: 60 percent / 75percent HClO4 / various solvent(s); H2O; dioxane / 12 h 6: Na2CO3, Pb(OAc)4 / CH2Cl2 View Scheme