Hydrochloric Acid → 1-(8-Hydroxy-5-methylquinolin-7-yl)ethanone

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A mixture of 5-methylquinolin-8-ol (5.91 g, 37.1 mmol, from ChemBridge), aluminum trichloride (20.00 g, 150.0 mmol), and acetyl chloride (12.1 mL, 170 mmol) was stirred at 0° C. for 4 hours, then heated at 130° C. for 12 hours, cooled, and decomposed with water (39 mL) (caution! with external ice-cooling if necessary) and conc. HCl (13 mL). The precipitate was filtered, and dried under reduced pressure. The solid obtained was then dissolved in 50 mL of water. To the solution was added 100 mL of dichloromethane. The mixture was cooled with an ice bath and the pH adjusted to 4 with slow addition of 20% NaOH. The layers were separated and the aqueous layer was extracted with dichloromethane. The combined organic layers were washed with water, brine and dried over sodium sulfate. The suspension was filtered through a plug of cotton and concentrated to dryness. The residue was used directly in the next step (5.8 g, 78%). LCMS calculated for C12H12NO2 (M+H)+: m/z=202.1; Found: 202.0.

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