1: pyridine / CH2Cl2 / 1 h / 130 °C 2: DBU / diethyl ether; tetrahydrofuran / 22 h / Heating 3: LiAlH4 / diethyl ether / 8 h / Ambient temperature 4: 83 percent / pyridinium chlorochromate, anhydr. sodium acetate / CH2Cl2; ethanol / 1.) 1 h, 0 deg C, 2.) RT, 3 h View Scheme