1.1: dichloromethane / 1.25 h / 0 °C 2.1: di-isopropyl ether / -10 °C / Resolution of racemate 3.1: 1,1-dimethylethylmagnesium chloride / tetrahydrofuran / 21 h / 20 - 50 °C 3.2: 60.25 h / 20 °C View Scheme

1.1: dichloromethane / 1.25 h / 0 °C 2.1: 1,1-dimethylethylmagnesium chloride / tetrahydrofuran / 0.58 h / 20 °C 2.2: 20 °C View Scheme

potassium carbonate