1: 63 percent / pyridinium p-toluenesulfonate / methanol / 2 h / 20 °C 2: 85 percent / Dess-Martin periodinane / CH2Cl2 / 2 h / 0 - 20 °C 3: 80 percent / NaClO2; NaH2PO4*2H2O / dimethylsulfoxide / 1 h / 0 - 20 °C 4: 85 percent / p-toluenesulfonic acid / methanol / 3 h / 20 °C 5: 85 percent / hydrogen; quinoline / Lindlar catalyst / ethyl acetate / 2 h View Scheme