1: 92 percent / pyridine / 0.5 h / 100 - 110 °C 2: 87 percent / tetraethylammonium fluoride / tetrahydrofuran / 24 h / Ambient temperature 3: 83 percent / H2 / 10percent Pd/C / ethanol; ethyl acetate / 12 h / 760 Torr / Ambient temperature View Scheme