1: KOH, pyridine / 2 h / 60 - 70 °C 2: H2SO4, AcOH / 1 h / 50 °C 3: 100 percent / N,N-diisopropylethylamine / CH2Cl2 4: 1.) dimethyldioxirane, 2.) TsOH / 1.) acetone, CH2Cl2, 0 deg C, 12 h, 2.) CH2Cl2, 0 deg C, 20 min 5: conc. HCl / acetic acid / 2 h / Ambient temperature 6: K2CO3 / acetone / Heating 7: AlBr3 / acetonitrile / 0.67 h / 0 °C 8: H2 / 10percent Pd/C / methanol; ethyl acetate View Scheme