Hexane → 5-Chloro-3-(2,4-dimethoxypyrimidin-5-yl)-3-hydroxy-1,3-dihydroindol-2-one

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A 1.6 M solution of n-butyllithium in hexane (10 ml, 16 mmol) was added dropwise to a solution of 5-bromo-2,4-dimethoxypyrimidine (3.29 g, 15 mmol) in THF (50 ml) at −78° C. After stirring at −78° C. for 0.5 h, a suspension of 5-chloroisatin (1.27 g, 7.0 mmol) in THF (50 ml) was added dropwise. The reaction mixture was allowed to warm to room temperature and then saturated ammonium chloride solution was added. The mixture was extracted three times with ethyl acetate, and the combined organic layers were washed with saturated brine. The organic phase was dried over magnesium sulfate, filtered and concentrated under reduced pressure. Purification by chromatography (silica gel, 50% ethyl acetate in dichloromethane) resulted in 0.97 g of the intermediate.

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