[OH:1][CH2:2][CH:3]1[CH2:12][CH2:11][C:10]2[C:5](=[CH:6][CH:7]=[C:8]([C:13]([O:15][CH3:16])=[O:14])[CH:9]=2)[CH2:4]1.N1C=CN=C1.[Si:22](Cl)([C:25]([CH3:28])([CH3:27])[CH3:26])([CH3:24])[CH3:23].CO>CN(C)C=O>[Si:22]([O:1][CH2:2][CH:3]1[CH2:12][CH2:11][C:10]2[C:5](=[CH:6][CH:7]=[C:8]([C:13]([O:15][CH3:16])=[O:14])[CH:9]=2)[CH2:4]1)([C:25]([CH3:28])([CH3:27])[CH3:26])([CH3:24])[CH3:23]In N,N-dimethylformamide (5 ml), (2RS)-2-hydroxymethyl-6-methoxycarbonyl-1,2,3,4-tetrahydronaphthalene (1.71 g) was dissolved. To the resulting solution, imidazole (0.81 g) and tert-butyldimethylsilyl chloride (1.81 g) were added under ice cooling, followed by stirring at room temperature for 14 hours. After the addition of methanol, the mixture was concentrated under reduced pressure. The concentrate was diluted with ethyl acetate, washed with water and then dried over anhydrous sodium sulfate. The residue obtained by distilling off the solvent under reduced pressure was purified by chromatography (hexane:ethyl acetate=50:1), whereby a pale yellow solid (2.20 g, 85%) was obtained.
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