1: 76 percent / tetramethylammonium acetate / hexamethylphosphoric acid triamide / 6 h / 90 - 95 °C 2: disodium hydrogen phosphate, 6percent sodium amalgam / tetrahydrofuran; ethanol / 2.5 h / -20 °C 3: 98 percent / hydrogen / 5percent palladium on barium carbonate / ethanol / 2 h / 1520 Torr / Ambient temperature View Scheme