1: 100 percent / PPTS / acetone 2: 95 percent / Zn, AcOH / methanol 3: 97 percent / diphenyl ether / 0.5 h / Heating 4: 83 percent / PDC / CH2Cl2 5: 100 percent / DIBAL / toluene / -78 °C 6: 84 percent / diisopropyl azodicarboxylate, PPh3 / tetrahydrofuran 7: 90 percent / aq. HCl / methanol / 3 h / Ambient temperature View Scheme