1: 89 percent / ZnBr2 / CH2Cl2 / 2 h / Ambient temperature 2: 1.) MCPBA / 1.) 0 deg C, 0.5 h, 2.) toluene, 100 deg C, 4 h 3: 62 percent / HCl / methanol; H2O / 8 h / Heating View Scheme