1: 74 percent / DIBAL / CH2Cl2 / 0.17 h / -78 °C 2: 90 percent / aq. NaHSO3; NaOH / 6 h / pH 9 View Scheme

1: 3-butyroyl-5,5-dimethyloxazolidin-2-one With diisobutylaluminium hydride in tetrahydrofuran T=0°C; 0.333333 h; 2: 3-(3'-phenylpropionyl)-5,5-dimethyloxazolidin-2-one With n-butyllithium in tetrahydrofuran T=0°C; 0.5 h; 3: in tetrahydrofuran T=20°C; 1 h; Further stages.;

1: 3-butyroyl-5,5-dimethyloxazolidin-2-one With diisobutylaluminium hydride in tetrahydrofuran T=0°C; 0.333333 h; 2: 3-(3'-phenylpropionyl)-5,5-dimethyloxazolidin-2-one With n-butyllithium in tetrahydrofuran T=0°C; 0.5 h; 3: in tetrahydrofuran T=20°C; 1 h; Further stages.;

1: 74 percent / DIBAL / CH2Cl2 / 0.17 h / -78 °C 2: 75 percent / aq. NaHSO3; NaOH / 6 h / pH 9 View Scheme

1: 3-(3'-phenylpropionyl)-5,5-dimethyloxazolidin-2-one With diisobutylaluminium hydride in tetrahydrofuran T=-78°C; Hydrogenation; 2: ethyl diethylphosphonoacetate lithium salt in tetrahydrofuran Elimination; Wittig olefination;