1: 1) sodium methoxide / 1.) methanol, 0.5 h, 2.) 3h, reflux 2: 54 percent / p-toluenesulfonic acid / toluene / 18 h / Heating 3: 30 percent / lithium aluminium hydride / tetrahydrofuran / 168 h / Heating 4: 94 percent / pyridine / 48 h / Heating View Scheme

1: 54 percent / p-toluenesulfonic acid / toluene / 18 h / Heating 2: 30 percent / lithium aluminium hydride / tetrahydrofuran / 168 h / Heating 3: 94 percent / pyridine / 48 h / Heating View Scheme

1: 1) sodium methoxide / 1.) methanol, 0.5 h, 2.) 3h, reflux 2: 54 percent / p-toluenesulfonic acid / toluene / 18 h / Heating 3: 30 percent / lithium aluminium hydride / tetrahydrofuran / 168 h / Heating 4: 94 percent / pyridine / 48 h / Heating View Scheme

in pyridine 48 h; Heating;

1: 30 percent / lithium aluminium hydride / tetrahydrofuran / 168 h / Heating 2: 94 percent / pyridine / 48 h / Heating View Scheme