1: 2.) 1,2-epoxybutane / 1.) CH2Cl2, 2.) acetonitrile, 80 deg C 2: triethylamine / CH2Cl2 / 1 h / 25 °C 3: 75 percent / 10percent HCl / 1,2-dimethoxy-ethane / 6 h / 65 °C 4: 47 percent / triphenylphosphine, diethyl azodicarboxylate / benzene / 65 h / 25 °C 5: Raney nickel / ethanol / 80 °C 6: LiAlH4 / tetrahydrofuran View Scheme