1: 5 percent / piperidine / benzene / 96 h / Heating 2: 1.) SnCl4 / 1.) CH2Cl2, -78 deg C, 15 min 2.) 20 h, room temp. 3: LiAlH4 / tetrahydrofuran / 24 h / Ambient temperature 4: pyridinium chlorochromate / CH2Cl2 / 3 h / Ambient temperature View Scheme