1: 84 percent / formic acid, conc. hydrochloric acid / 1 h / 110 °C 2: 82 percent / lithium aluminium hydride / tetrahydrofuran / 0.5 h / Heating 3: 6 N aq. HCl / tetrahydrofuran 4: 100 percent / H2 / 10percent palladium on carbon / tetrahydrofuran / 0.25 h View Scheme