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温度

0 °C

To a solution of methyl 3-amino-2-fluorobenzoate (21.8 g, 129 mmol) in DCM (300 mL) were added pyridine (30.6 g, 387.6 mmol) and a catalytic amount of DMAP. The mixture was cooled to 0° C. 2,5-Difluorobenzene-1-sulfonyl chloride (28.8 g, 136 mmol) in DCM (20 mL) was added dropwise to the mixture. The reaction was stirred at rt overnight. The reaction mixture was washed with water (300 mL), and extracted with DCM (2×200 mL). The organic layer was washed with brine, dried over anhydrous NaSO4, filtered and concentrated under reduced pressure to give the crude product, which was washed with petroleum ether to afford the title compound of Step A. (16 g, 35.9%). 1H NMR (400 MHz, DMSO-d6) δ ppm 10.71-10.91 (br, 1H), 7.65-7.73 (m, 1H), 7.48-7.62 (m, 4H), 7.20-7.28 (m, 1H), 3.77 (s, 3H).

1. washThe reaction mixture was washed with water (300 mL)
2. extractionextracted with DCM (2×200 mL)
3. washThe organic layer was washed with brine
4. dry with materialdried over anhydrous NaSO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customto give the crude product, which
8. washwas washed with petroleum ether