[OH:1][CH2:2][C@H:3]([CH3:8])[C:4]([O:6][CH3:7])=[O:5].N1C=CN=C1.[C:14]([Si:18]([CH3:21])([CH3:20])Cl)([CH3:17])([CH3:16])[CH3:15].O>CN(C)C=O.CCCCCC>[Si:18]([O:1][CH2:2][C@H:3]([CH3:8])[C:4]([O:6][CH3:7])=[O:5])([C:14]([CH3:17])([CH3:16])[CH3:15])([CH3:21])[CH3:20]A mixture of methyl (S)-(+)-3-hydroxy-2-methylpropionate (1.00 g; 8.47 mmol) and imidazole (1.15 g; 16.9 mmol) was dissolved in anhydrous dimethylformamide (10 ml), and t-butyl-dimethylchlorosilane (1.30 g; 8.62 mmol) was added thereto at room temperature, followed by stirring at room temperature for 1.5 hours. To the reaction mixture, water (10 ml) and hexane (20 ml) were added, and after separation of the organic layer, the aqueous layer was extracted with hexane (10 ml) two times. The organic layers were combined together, washed with water (5 ml) three times and dried over anhydrous magnesium sulfate. Removal of the solvent by distillation under reduced pressure gave methyl (S)-(+)-3-(t-butyldimethylsilyloxy)-2-methylpropionate (1.91 g; yield, 97%) as a colorless oil. A portion of the oil (179 mg) was distilled by Kugelrohr® to give a purified product (176 mg) (bath temperature: 120° C./14 mmHg).
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