Dichloromethane → 2-Fluoroethyl 4-({6-[5-(methylsulfonyl)indolin-1-yl]pyrimidin-4-yl}oxy)piperidine-1-carboxylate

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Reaction Steps

Diisopropylethylamine (178 μL, 0.997 mmol) and (2-fluoroethyl) chloroformate (33 μL, 0.350 mmol) were added at 0° C. to a dichloromethane (2 mL) suspension of the 5-(methylsulfonyl)-1-[6-(piperidin-4-yloxy)pyrimidin-4-yl]indoline hydrochloride (188 mg, 0.396 mmol) produced in Reference Example 27, and the mixture was stirred at room temperature for 80 minutes. To the reaction solution, water was added, followed by extraction with ethyl acetate three times. The obtained organic layer was washed with water and saturated saline and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The obtained residue was purified by silica gel column chromatography [(i) hexane:dichloromethane=1:1, V/V; (ii) hexane:ethyl acetate:dichloromethane=2:1:2-1:1:1-2:2:1, V/V; (iii) ethyl acetate:dichloromethane=1:1, V/V] to obtain the title compound as white powder (58.8 mg, yield: 38%).

Provenance & Evidence