1: 1.93 g / pyridine / 24 h / Ambient temperature 2: 1M borane / various solvent(s) / 1.) -5 deg C, 5 min, 2.) room temp., 24 h 3: 0.51 g / pyridine / 24 h / Ambient temperature 4: 75 percent / 3M sodium methoxide / CHCl3; methanol / 0.05 h / Heating View Scheme