1: 84 percent / 1 N NaOH / tetrahydrofuran / 18 h 2: H2 / 5percent palladium on carbon / methanol / 18 h / 1292.9 Torr 3: 80 percent / methanol / 3 h / Heating 4: 86 percent / 0.1 N HCl / trifluoroacetic acid / 0.5 h / 55 °C 5: 1.) sodium dithionite, 2.) 0.1 N NaOH / 1.) DMF/H2O, 55 deg C, 2.) 1 h View Scheme

1: 84 percent / 1 N NaOH / tetrahydrofuran / 18 h 2: H2 / 5percent palladium on carbon / methanol / 18 h / 1292.9 Torr 3: 80 percent / methanol / 4 h / Heating 4: 86 percent / 0.1 N HCl / trifluoroacetic acid / 55 °C View Scheme