Tetrahydrofuran → 4-(1-cyclopentyl-7-fluoro-1H-indazol-3-yl)phenyl ethyl hydrogen phosphate

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A solution of 4-(1-cyclopentyl-7-fluoro-1H-indazol-3-yl)phenol (0.30 g, 1.0 mmol), ethyl dichlorophosphate (0.13 mL, 1.1 mmol), and lithiumhexamethyldisilazide (0.183 g, 1.1 mmol) in 10 mL of THF was stirred for 1 hour at ambient temperature. The reaction mixture was quenched with H2O and concentrated in vacuo. The residues were purified by reversed phase HPLC (Column: HS Hyperprep C18 8 u ID 22 mm; solvent gradient 40% to 100% acetonitrile (0.1% TFA) in H2O; flowrate 10 mL/min) to give 0.065 g of the title compound as a white solid.

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