1.1: pyridine / CH2Cl2 / 12 h / 0 °C 1.2: 7.21 g / CH2Cl2 / 18 h / 0 - 20 °C 2.1: 91 percent / 2,2,6,6-tetramethylpiperidine / (R,R)-DBFOX/Ph; nickel(II) perchlorate hexahydrate / tetrahydrofuran / 168 h / -20 °C 3.1: 72 percent / H2 / Raney Ni / ethanol; CH2Cl2 / 96 h / 20 °C / 760.05 Torr View Scheme