Ethoxalyl chloride → Ethyl [(3-chloro-2,6-difluorophenyl)carbamoyl]formate

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Reaction Steps

To a solution of 3-chloro-2,6-difluoroaniline (430 mg, 2.55 mmol) and TEA (0.5 mL, 3.59 mmol) in THF (5 mL) was added ethyl 2-chloro-2-oxoacetate (0.3 mL, 2.63 mmol). A white precipitate was formed immediately. After 30 min, the reaction mixture was filtered and rinsed with ether. The filtrate was concentrated to yield a crude yellow oil, which was purified by silica gel chromatography to yield the desired product (484 mg, 72%) as a white solid. 1H NMR (500 MHz, CDCl3) δ 8.42 (br. s., 1H), 7.35 (m, 1H), 6.98 (m, 1H), 4.45 (q, J=7.2 Hz, 2H), 1.45 (t, J=7.2 Hz, 3H). MS (ESI) m/z: 263.9 (M+H)+.

Provenance & Evidence