Triethylamine → Ethyl 2-[2,5-difluorobenzoyl]-3-dimethylamino-2-propenoate

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A solution of 2,5-difluorobenzoyl chloride (5.26 g, 29.8 mmol) in toluene (100 mL) was treated with ethyl-3-(dimethylamino)-2-propenoate (5.27 g, 36.8 mmol), followed by triethylamine (5.9 mL, 42.5 mmol). The mixture was stirred at 90° C. for 6.5 h then allowed to cool, and the precipitate removed by filtration. The filtrate was concentrated under reduced pressure to give a residue which was purified by flash chromatography (silica gel, 50-100% diethyl ether in petroleum ether [b.p. 40-60° C.]) to give the title compound as a yellow oil (0.95 g); ESMS m/z 284.4 [M+H]+.

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