[CH2:1]([O:3][C:4](=[O:13])[C:5]1[CH:10]=[CH:9][C:8]([OH:11])=[CH:7][C:6]=1[CH3:12])[CH3:2].N1C=CN=C1.[Si:19](Cl)([C:22]([CH3:25])([CH3:24])[CH3:23])([CH3:21])[CH3:20]>CN(C=O)C.O>[CH2:1]([O:3][C:4](=[O:13])[C:5]1[CH:10]=[CH:9][C:8]([O:11][Si:19]([C:22]([CH3:25])([CH3:24])[CH3:23])([CH3:21])[CH3:20])=[CH:7][C:6]=1[CH3:12])[CH3:2]A mixture of 18 g (100 mmol) of 4-hydroxy-2-methyl-benzoic acid ethyl ester (prepared according to Sen, et. al. (1987), Indian J. Chem. Sec B, 26: 679-682), 10.2 g (150 mmol) of imidazole, and 17.2 g (115 mmol) of tert-butyldimethylsilyl chloride in 110 mL of anhydrous DMF was stirred for 24 hours at room temperature. The reaction was diluted with water and extracted with ethyl acetate. The organic fraction was washed with water, 0.1 N HCl, and brine, then dried over anhydrous magnesium sulfate and concentrated to 28.8 g of the title compound; MS (ESI+): m/z 295.5 (M+1)
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