1: 26 percent / tetrahydrofuran; toluene / 10 h / 25 °C 2: K3Fe(CN)6; (DHQD)2 chiral ligand; K2CO3 / OsO4 / H2O; 2-methyl-propan-2-ol / 0 °C 3: sodium chlorite; NaH2PO4; resorcinol / dimethylsulfoxide; H2O / 1 h / 0 °C 4: HBr / 2,2,2-trifluoro-ethanol / 24 h / 80 °C 5: potassium carbonate / 2,2,2-trifluoro-ethanol / 1 h / 25 °C View Scheme