1: 85 percent / 80percent AcOH, 2N HCl / H2O / 5 h / 90 °C 2: 90 percent / 2,6-lutidine, KF, 18-crown-6 ether / CH2Cl2 / 0.5 h / Ambient temperature 3: 11 percent / 1.) molecular sieves 4 Angstroem, 2.) BF3*Et2O / CH2Cl2 / 0.33 h / -40 °C 4: 76 percent / H2 / Pd/C / ethyl acetate; methanol / 1 h / 760 Torr / Ambient temperature View Scheme