disodium hydrogenphosphate; sodium amalgam in tetrahydrofuran; methanol 7 h;

1: 1.) n-BuLi / 1.) THF, hexane, -60 deg C, 10 min, 2.) 2 h, RT 2: 85 percent / 6percent sodium amalgam, Na2HPO4 / tetrahydrofuran; methanol / 7 h View Scheme

1: sodium ethoxide / 1.) ethanol, 2.) reflux, 1.5 h 2: 1.) n-BuLi / 1.) THF, hexane, -60 deg C, 10 min, 2.) 2 h, RT 3: 85 percent / 6percent sodium amalgam, Na2HPO4 / tetrahydrofuran; methanol / 7 h View Scheme