1: 54 percent / Al2O3 / 1.) 0 deg C, 70 min; 2.) RT; 3.) CH2Cl2, 50 deg C 2: 48 percent / aq. NaOAc, sodium hypophosphite / Raney-nickel / ethanol; acetic acid / 3 h / 50 °C / pH=5.0 3: 90 percent / Amberlyst-15 / acetone; H2O / Heating View Scheme