1: 81 percent / 2 M oxalyl chloride, dimethyl sulfoxide, triethylamine / CH2Cl2 / -60 °C 2: 1) sodium methylsulfinylmethide / 1) dimethyl sulfoxide, tetrahydrofuran, 0 deg C, 2 min, 2) tetrahydrofuran, 0 deg C, 30 min, then 24 deg C, 1 h 3: hexane; methanol / 14 h / Heating 4: hydrochloric acid / ethanol View Scheme

oxalyl dichloride; dimethyl sulfoxide; triethylamine in dichloromethane T=-60°C;

1: 81 percent / 2 M oxalyl chloride, dimethyl sulfoxide, triethylamine / CH2Cl2 / -60 °C 2: 1) sodium methylsulfinylmethide / 1) dimethyl sulfoxide, tetrahydrofuran, 0 deg C, 2 min, 2) tetrahydrofuran, 0 deg C, 30 min, then 24 deg C, 1 h 3: hexane; methanol / 14 h / Heating View Scheme

1: 81 percent / 2 M oxalyl chloride, dimethyl sulfoxide, triethylamine / CH2Cl2 / -60 °C 2: 1) sodium methylsulfinylmethide / 1) dimethyl sulfoxide, tetrahydrofuran, 0 deg C, 2 min, 2) tetrahydrofuran, 0 deg C, 30 min, then 24 deg C, 1 h 3: hexane; methanol / 14 h / Heating 4: hydrochloric acid / ethanol 5: 93 percent / hydrogen / 5 percent palladium on carbon / ethanol / 0.25 h / 775.7 Torr View Scheme