1.1: triphenylphosphine; diethylazodicarboxylate / dichloromethane / 6 h / 20 °C / |Cooling with ice 2.1: ammonium chloride / water / 5 h / 110 °C / |Sealed tube 3.1: L-(+)-tartaric acid / ethanol / 1 h / 20 °C / |Reflux; |Resolution of racemate 3.2: 20 °C / pH 9-10 / |Reflux; |Resolution of racemate View Scheme

1.1: triphenylphosphine; diethylazodicarboxylate / dichloromethane / 6 h / 20 °C / |Cooling with ice 2.1: ammonium chloride / water / 5 h / 110 °C / |Sealed tube 3.1: L-(+)-tartaric acid / ethanol / 1 h / 20 °C / |Reflux; |Resolution of racemate 3.2: 20 °C / pH 9-10 / |Reflux; |Resolution of racemate View Scheme

1.1: triphenylphosphine; diethylazodicarboxylate / dichloromethane / 6 h / 20 °C / |Cooling with ice 2.1: ammonium chloride / water / 5 h / 110 °C / |Sealed tube 3.1: L-(+)-tartaric acid / ethanol / 1 h / 20 °C / |Reflux; |Resolution of racemate 3.2: 20 °C / pH 9-10 / |Reflux; |Resolution of racemate View Scheme

1.1: triphenylphosphine; diethylazodicarboxylate / dichloromethane / 6 h / 20 °C / |Cooling with ice 2.1: ammonium chloride / water / 5 h / 110 °C / |Sealed tube 3.1: (2S,3S)-2,3-dihydroxybutanedioic acid / ethanol / 1 h / 20 °C / |Reflux; |Resolution of racemate 3.2: 20 °C / pH 9-10 / |Reflux; |Resolution of racemate View Scheme

Jone's reagent in acetone T=0 - 20°C; Inert atmosphere;