[OH:1][CH2:2][C:3]1[CH:12]=[CH:11][C:10]2[C:5](=[CH:6][CH:7]=[C:8]([CH2:13][OH:14])[CH:9]=2)[CH:4]=1.[Si:15](Cl)([C:18]([CH3:21])([CH3:20])[CH3:19])([CH3:17])[CH3:16].[Cl-].[NH4+]>CN(C=O)C.N1C=CN=C1>[Si:15]([O:1][CH2:2][C:3]1[CH:12]=[CH:11][C:10]2[C:5](=[CH:6][CH:7]=[C:8]([CH2:13][OH:14])[CH:9]=2)[CH:4]=1)([C:18]([CH3:21])([CH3:20])[CH3:19])([CH3:17])[CH3:16]The compound (3.41 g) obtained in Example 121-1 was dissolved in anhydrous DMF (200 ml). Then, t-butyldimethylsilyl chloride (2.73 g) dissolved in imidazole (1.48 g) and anhydrous DMF (50 ml) was dropped in this solution, and the whole was stirred overnight at room temperature. After completion of the reaction, the solution was added with a saturated aqueous ammonium chloride solution and stirred. The solution was extracted with chloroform and the extract was then washed with a saturated aqueous sodium bicarbonate solution, a saturated aqueous ammonium chloride solution, and saturated saline solution. Then, the organic layer was dried with anhydrous sodium sulfate. Subsequently, the solvent was distilled off and the residue was then purified through silica gel column chromatography (chloroform), thereby obtaining the subject compound (2.68 g) as a white solid.
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