1: 95 percent / Zn, AcOH / methanol 2: 97 percent / diphenyl ether / 0.5 h / Heating 3: 83 percent / PDC / CH2Cl2 4: 100 percent / DIBAL / toluene / -78 °C 5: 84 percent / diisopropyl azodicarboxylate, PPh3 / tetrahydrofuran 6: 90 percent / aq. HCl / methanol / 3 h / Ambient temperature View Scheme