1.1: oxalyl chloride / CH2Cl2; dimethylformamide / cooling 2.1: NaHCO3 / CH2Cl2 / 20 °C 3.1: 98 percent / triphenylphosphine oxide; trifluoromethanesulfonic anhydride / CH2Cl2 / 0 - 20 °C 4.1: K3Fe(CN)6; potassium carbonate; CH3SO2NH2 / (DHQD)2-PYR; K2OsO2(OH)4 / 2-methyl-propan-2-ol; H2O / 40 h / 0 °C 4.2: 71 percent / iodine; CaCO3 / methanol; H2O / 15 h / 40 °C View Scheme

1.1: oxalyl chloride / CH2Cl2; dimethylformamide / cooling 2.1: NaHCO3 / CH2Cl2 / 20 °C 3.1: 98 percent / triphenylphosphine oxide; trifluoromethanesulfonic anhydride / CH2Cl2 / 0 - 20 °C 4.1: K3Fe(CN)6; potassium carbonate; CH3SO2NH2 / (DHQD)2-PYR; K2OsO2(OH)4 / 2-methyl-propan-2-ol; H2O / 40 h / 0 °C 4.2: iodine; CaCO3 / methanol; H2O / 15 h / 40 °C View Scheme