1.1: 91 percent / N-methylmorpholine N-oxide / tetrapropylammonium perruthenate / CH2Cl2 / 0.5 h / 20 °C 2.1: potassium hexamethyldisilazide / tetrahydrofuran; toluene / 0.5 h 2.2: 85 percent / tetrahydrofuran; toluene / -78 - 20 °C 3.1: 97 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / H2O; CH2Cl2 / 2 h / 0 °C 4.1: DMSO; oxalyl chloride; Et3N / CH2Cl2 / 0.92 h / -78 °C 5.1: dibutylboron triflate; diisopropylethylamine / CH2Cl2 / 0.5 h / -78 °C 5.2: CH2Cl2 / 3 h / -78 - 20 °C 6.1: 12 mg / pyridine; chromium trioxide / CH2Cl2 / 0.33 h / 20 °C 7.1: 85 percent / HF / H2O; acetonitrile / 3 h / 20 °C 8.1: LiOH / H2O; 1,2-dimethoxy-ethane / 7 h / 80 °C View Scheme