1: 50 percent / H2, Et3N / Pd/C / ethyl acetate; ethanol / 72 h / 50 °C / 38000 Torr 2: 65 percent / DBU / CH2Cl2 / 6 h / Ambient temperature 3: 69 percent / 4A MS, TMSOTf / CH2Cl2 / 0.33 h / -20 °C 4: 79 percent / Pd(MeCN)2Cl2 / acetone; H2O / Ambient temperature View Scheme