1: 54.4 percent / AgSO3CF3, Me2NCONMe2 / CH2Cl2 / 21 h / -5 - 25 °C 2: 90.7 percent / AgSO3CF3, Me2NCONMe2 / CH2Cl2 / 19 h / -15 - 20 °C 3: 83.2 percent / NaOMe / methanol; tetrahydrofuran / 16 h / 20 °C 4: H2 / Pd-C / ethanol; H2O / 20 deg C, 16 h; 50 deg C, 2 h View Scheme