[Cl:1][C:2]1[C:7]([CH2:8][CH2:9][OH:10])=[C:6]([Cl:11])[N:5]2[N:12]=[CH:13][CH:14]=[C:4]2[N:3]=1.C(N(CC)CC)C.[C:22]([Si:26](Cl)([CH3:28])[CH3:27])([CH3:25])([CH3:24])[CH3:23].[Cl-].[NH4+]>C(Cl)Cl>[Si:26]([O:10][CH2:9][CH2:8][C:7]1[C:2]([Cl:1])=[N:3][C:4]2[N:5]([N:12]=[CH:13][CH:14]=2)[C:6]=1[Cl:11])([C:22]([CH3:25])([CH3:24])[CH3:23])([CH3:28])[CH3:27]To a methylene chloride (50 mL) solution containing 2-(5,7-dichloropyrazolo[1,5-a]pyrimidin-6-yl)ethanol (640 mg, 2.77 mmol), triethylamine (3.86 mL, 27.7 mmol) and tert-butylchlorodimethylsilane (1.25 g, 8.31 mmol) were added, and this mixture was stirred at room temperature for 16 hr. After the reaction, aqueous ammonium chloride was added to the reaction solution, and the mixture was extracted with ethyl acetate. The combined ethyl acetate layer was washed with saturated aqueous sodium hydrogen carbonate and then brine and dried over sodium sulfate. After the sodium sulfate was filtered off, the solvent was distilled off and the residue was purified with column chromatography (15% ethyl acetate-hexane) to obtain the title compound (1.04 g).
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