Hydrochloric Acid → 2-(5,7-Difluoro-quinolin-6-yl)-malonic acid diethyl ester

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Reaction Steps

Ethyl malonate (9.28 g, 8.8 mL, 58.0 mmol) was added dropwise to a mixture of sodium hydride (60 percent in mineral oil, 2.32 g, 58.0 mmol) in 1,4-dioxane (29 mL) at 60° C. CuBr (4.176 g, 29.0 mmol) and 6-bromo-5,7-difluoro-quinoline (7.07 g, 29.0 mmol) were then added and the mixture heated to reflux for 16 h. After such time concentrated hydrochloric acid was added under ice-cooling and then tert-butyl methyl ether and water were added. The separated organic layer was washed with (10%) hydrochloric acid and water sequentially. Dried over sodium sulfate and concentrated. The residue was purified by column chromatography to afford the title compound (3.13 g, 35.4%).

Provenance & Evidence