[CH3:1][O:2][C:3](=[O:11])[C:4]1[CH:9]=[CH:8][CH:7]=[C:6]([OH:10])[CH:5]=1.N1C=CN=C1.[Si:17](Cl)([C:20]([CH3:23])([CH3:22])[CH3:21])([CH3:19])[CH3:18].[Cl-].[NH4+]>CN(C=O)C>[CH3:1][O:2][C:3](=[O:11])[C:4]1[CH:9]=[CH:8][CH:7]=[C:6]([O:10][Si:17]([C:20]([CH3:23])([CH3:22])[CH3:21])([CH3:19])[CH3:18])[CH:5]=1
1.53 g of 3-hydroxybenzoic acid methyl ester and 1.69 g of imidazole were placed in a 50 ml flask, and a gas in the reaction system was replaced with nitrogen. 5 ml of DMF was added into the flask and stirred at 0° C. The obtained solution was mixed with 1.57 g of t-butyldimethylsilyl chloride, heated up to room temperature, simultaneously stirred overnight, and then mixed with a saturated aqueous solution of ammonium chloride to stop the reaction. The reaction solution was extracted with diethyl ether, and the obtained organic layer was sequentially washed with water, a saturated aqueous solution of potassium hydrogen sulfate and a saturated aqueous solution of sodium chloride and then dried over magnesium sulfate. The solvent was distilled away under reduced pressure to obtain 1.69 g of the title compound. Yield: 98%.
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