1: 92 percent / aq. sodium chlorite; sodium phosphate monobasic dihydrate; hydrogen peroxide / acetonitrile; H2O / 15 h / 10 °C 2: oxalyl chloride; DMF / CH2Cl2 / 1 h / 10 °C 3: NEt3 / CH2Cl2 / 5 h / 20 °C 4: 71 percent / DPPP; n-Bu3P; i-Pr2NEt / Pd(OAc)2 / dimethylformamide / 0.75 h / Heating View Scheme