[CH3:1][C:2]([CH3:8])([CH2:5][CH2:6][OH:7])[CH2:3][OH:4].N1C=CN=C1.[Si:14](Cl)([C:17]([CH3:20])([CH3:19])[CH3:18])([CH3:16])[CH3:15]>C1COCC1>[Si:14]([O:7][CH2:6][CH2:5][C:2]([CH3:8])([CH3:1])[CH2:3][OH:4])([C:17]([CH3:20])([CH3:19])[CH3:18])([CH3:16])[CH3:15]To a solution of the product from Example 9A (0.80 g, 6.8 mmol) and imidazole (0.462 g) in THF (8.0 mL) at room temperature was added tert-butyldimethylsilyl chloride (1.02 g), and the solution was stirred for 16 hours. The reaction mixture was partitioned between ethyl acetate and water, and the organic was washed with brine, dried over MgSO4, filtered and evaporated. The residue was purified by chromatography on silica gel, eluting with a gradient starting with 33% hexanes in chloroform and ending with 25% ethyl acetate in chloroform, to give the title compound (1.153 g, 73%).
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