Chloroform → Methyl 6-bromo-2-methylquinoline-3-carboxylate

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Reaction Steps

To DMF (7.18 ml) was dropwise added phosphoryl chloride (8.64 ml) at 0° C., and the mixture was stirred at room temperature for 30 minutes. To the mixture was added methyl acetoacetate (10 ml) at 0° C., and the mixture was stirred at room temperature for 2hours. The mixture was cooled to 0° C., and to the mixture was added 4-bromoaniline (16.78 g), and the mixture was stirred at 90° C. for 4 hours. To the reaction mixture was added chloroform, and the mixture was neutralized with 8N sodium hydroxide. The organic layer was washed with water and saturated sodium chloride solution, dried with magnesium sulfate and concentrated under reduced pressure. The residue was separated and purified with column chromatography (ethyl acetate/hexane=1:2) and was recrystallized from ethyl acetate-hexane to give methyl 6-bromo-2-methylquinoline-3-carboxylate (6.02 g) as pale yellow crystals.

Provenance & Evidence