1: 80 percent / m-CPBA, NaHCO3 / benzene / 9 h / Ambient temperature 2: 76 percent / DBU, DMAP / CH2Cl2 / 24 h / Ambient temperature 3: 86 percent / m-CPBA, NaHCO3 / CH2Cl2 / 3 h / Ambient temperature 4: 54 percent / palladium acetate, bidentate phosphite ligand, n-BuLi, trimethyltin acetate / tetrahydrofuran; hexane / 42 h / Heating 5: 1.) DIBAL-H, 2.) 30percent aq. sodium potassium tartrate, triethanolamine, 3.) NaoMe, MeOH 6: aq. HF / acetonitrile / 16 h / Ambient temperature 7: Na, liquid NH3 / -78 °C View Scheme