1: H2SO4 / 1.5 h 2: p-toluenesulfonic acid / benzene / 2 h / Heating 3: LiAlH4 / tetrahydrofuran / Ambient temperature 4: pyridine / 18 h / Ambient temperature 5: 1.) K2CO3 / 1.) DMF, 120 deg C, 1 h, 2.) DMF, 120 deg C 6: HCl, MeOH / Ambient temperature View Scheme

1: LiAlH4 / tetrahydrofuran / Ambient temperature 2: pyridine / 18 h / Ambient temperature 3: 1.) K2CO3 / 1.) DMF, 120 deg C, 1 h, 2.) DMF, 120 deg C 4: HCl, MeOH / Ambient temperature View Scheme

1: p-toluenesulfonic acid / benzene / 2 h / Heating 2: LiAlH4 / tetrahydrofuran / Ambient temperature 3: pyridine / 18 h / Ambient temperature 4: 1.) K2CO3 / 1.) DMF, 120 deg C, 1 h, 2.) DMF, 120 deg C 5: HCl, MeOH / Ambient temperature View Scheme