Citric Acid → 5-[[(1,1-Dimethylethyl)dimethylsilyl]oxy]-1H-indazole

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Reaction Steps

5-Hydroxyindazole (3.00 g, 22.37 mmol), tert-butyldimethylsilyl chloride (4.05 g, 26.8 mmol) and imidazole (2.28 g, 33.5 mmol) were mixed in DCM (50 mL) and stirred at room temperature for 18 hours. The reaction mixture was poured into 0.5 N aqueous citric acid solution and extracted with DCM (3×25 mL). The combined organics were dried over magnesium sulfate, filtered and evaporated to dryness. The residue was purified by silica gel chromatography eluting with 0 to 50% EtOAc in hexane to yield the title compound as an orange solid (5.09 g, 90%):

Provenance & Evidence