1: 100 percent / N,N-diisopropylethylamine / CH2Cl2 2: 1.) dimethyldioxirane, 2.) TsOH / 1.) acetone, CH2Cl2, 0 deg C, 12 h, 2.) CH2Cl2, 0 deg C, 20 min 3: conc. HCl / acetic acid / 2 h / Ambient temperature 4: K2CO3 / acetone / Heating 5: AlBr3 / acetonitrile / 0.67 h / 0 °C 6: H2 / 10percent Pd/C / methanol; ethyl acetate View Scheme