1: (S)-(-)-4-benzyl-2-oxazolidinone With n-butyllithium; triphenylemethane in tetrahydrofuran; hexane T=-78°C; 1 h; 2: 3-methyl-butyryl chloride in tetrahydrofuran; hexane T=-78 - 20°C; 2.5 h; 3: With potassium carbonate in tetrahydrofuran; hexane; water
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