1: 93 percent / potassium carbonate / dimethylsulfoxide / 1.5 h / 50 °C 2: 85 percent / NaBH4 / methanol; bis-(2-methoxy-ethyl) ether / 18 h / 50 °C 3: 96 percent / pyridine / 16 h / Ambient temperature 4: 98 percent / aq. HCl / 3 h / Heating View Scheme

1: 93 percent / potassium carbonate / dimethylsulfoxide / 1.5 h / 50 °C 2: 85 percent / NaBH4 / methanol; bis-(2-methoxy-ethyl) ether / 18 h / 50 °C 3: 96 percent / pyridine / 16 h / Ambient temperature 4: 91 percent / Raney nickel / ethanol; H2O / 1 h / Heating View Scheme