CN(C)C=O.[OH:6][C:7]1[CH:8]=[C:9]([CH:22]=[CH:23][CH:24]=1)[C:10]([O:12][CH2:13][CH2:14][O:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)=[O:11].[C:25]([Si:29](Cl)([CH3:31])[CH3:30])([CH3:28])([CH3:27])[CH3:26].N1C=CN=C1>O>[O:6]([C:7]1[CH:8]=[C:9]([CH:22]=[CH:23][CH:24]=1)[C:10]([O:12][CH2:13][CH2:14][O:15][C:16]1[CH:17]=[CH:18][CH:19]=[CH:20][CH:21]=1)=[O:11])[Si:29]([C:25]([CH3:28])([CH3:27])[CH3:26])([CH3:31])[CH3:30]Into a 250 mL round bottom flask was added 30 mL of dry dimethyl formamide. Five parts of hydroxy ester (53) and 3.5 parts of tert-butyldimethyl silyl chloride were added to the reaction flask with stirring. Three parts of Imidazole was added in portions and stirring was continued for 10 hours. The reaction mixture was diluted with 80 mL of water and the product was extracted with ethyl acetate. The organic layer was washed with water and dried on anhydrous sodium sulfate. The solvent was evaporated under reduced pressure to give an oil, yield 6.80 parts. This material was pure enough for next step of the reaction. The reaction proceeded as follows:
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