1.1: dimethylsulfide borane complex; boron trifluoride diethyl etherate / tetrahydrofuran / 4 h / 80 °C 1.2: 0 °C 1.3: pH 8 2.1: thionyl chloride / anhydrous dichloroethane / 2 h / 0 - 20 °C 2.2: 0 °C / pH 8 View Scheme

1.1: dimethylsulfide borane complex; boron trifluoride diethyl etherate / tetrahydrofuran / 4 h / 80 °C 1.2: 0 °C 1.3: pH 8 2.1: thionyl chloride / anhydrous dichloroethane / 2 h / 0 - 20 °C 2.2: 0 °C / pH 8 3.1: triethylamine / dichloromethane / 2 h / 0 °C View Scheme