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({[5,5-Dimethyl-2-(4-methylphenyl)-1,3-dioxan-2-yl]methyl}thio)acetic acid (8.7 g, 28.0 mmol) was dissolved in dry CH2Cl2 (120 ml) and cooled to 0° C. N,N′-Dicyclohexylcarbodiimide (DCC, 6.35 g, 30.8 mmol) in 30 ml of CH2Cl2 and 4-(dimethylamino)pyridine (DMAP, 6.85 g, 56.1 mmol) were added. The mixture was stirred at 0° C. for 30 minutes. (S)-(+)-4-Phenyl-2-oxazolidinone (4.57 g, 28.0 mmol) was added and the mixture was stirred at room temperature for 19 h. The mixture was filtered, concentrated under reduced pressure and purified by flash-chromatography (hexane:EtOAc 5:1 then 4:1). This afforded 7.07 g (55%) of the title compound as a white solid. 1H-NMR (CDCl3, 200 MHz): δ 0.6 (s, 3H), 1.2 (s, 3H), 2.4 (s, 3H), 2.8 (s, 2H), 3.4 (s, 4H), 3.8 (s, 2H), 4.3 (dd, 1H), 4.7 (t, 1H), 5.4 (dd, 1H), 7.2-7.5 (m, 9H).

1. stirringthe mixture was stirred at room temperature for 19 h
2. filtrationThe mixture was filtered
3. concentrationconcentrated under reduced pressure
4. custompurified by flash-chromatography (hexane:EtOAc 5:1