1: 43 percent / DIBAL / toluene / 0.75 h / -78 °C 2: 93 percent / Dowex 50x resin / CH2Cl2 / 16 h / Ambient temperature 3: 52 percent / H2 / 10percent Pd-C / methanol / 0.33 h / 760 Torr / Ambient temperature 4: 47 percent / Amberlite IR-120(H+) resin / acetonitrile; H2O / 4 h / Ambient temperature View Scheme