1: (4S)-5,5-dimethyl-4-phenyl-1,3-oxazolidin-2-one With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.25 h; 2: 3-phenyl-propionyl chloride in tetrahydrofuran; hexane T=-78 - 20°C; Further stages.;

1.1: 26 percent / DIBAL / CH2Cl2; hexane / 0.33 h / -78 °C 2.1: n-BuLi / tetrahydrofuran; hexane / 0.25 h / -78 °C 2.2: 94 percent / tetrahydrofuran; hexane / -78 - 20 °C View Scheme

1.1: LHMDS / tetrahydrofuran / 0.5 h / 0 °C 1.2: 77 percent / tetrahydrofuran / 5 h / 0 °C 2.1: 26 percent / DIBAL / CH2Cl2; hexane / 0.33 h / -78 °C View Scheme