反应详情

温度

100 °C

To a solution of methyl 5-bromo-3,4-difluoro-2-((2-fluorophenyl)amino)benzoate (22.33 g, 62.01 mmol) in anhydrous 1,4-dioxane (200 mL) was added N,N-diisopropylethylamine (16.03 g, 124.04 mmol). Then Pd2(dba)3 (2.84 g, 3.10 mmol) followed by Xantphos (3.59 g, 6.20 mmol) and 4-methoxy-α-toluenethiol (10.27 g, 65.11 mmol) was added under nitrogen atmosphere. The mixture was stirred overnight at 100° C. under N2 atmosphere and then allowed to warm to ambient temperature. The insoluble matter was filtered off and the filter cake was washed ethyl acetate. The filtrate was diluted with water (300 mL) and extracted with ethyl acetate (100 mL×3). The combined organic layers were washed with water (100 mL) and brine (100 mL) sequentially, dried over Na2SO4, filtered and concentrated. The crude product was purified by column chromatography on silica gel (petroleum ether/ethyl acetate, 50:1, v/v) to give the desired product (pale yellow solid, 24.35 g, 90.6% yield). 1H NMR (400 MHz, CDCl3): δ 9.12 (s, 1H), 7.78 (d, 1H), 7.25 (m, 6H), 6.85 (m, 2H), 4.03 (s, 2H), 3.90 (s, 3H), 3.80 (s, 3H).

1. additionwas added under nitrogen atmosphere
2. temperatureto warm to ambient temperature
3. filtrationThe insoluble matter was filtered off
4. washthe filter cake was washed ethyl acetate
5. additionThe filtrate was diluted with water (300 mL)
6. extractionextracted with ethyl acetate (100 mL×3)
7. washThe combined organic layers were washed with water (100 mL) and brine (100 mL) sequentially
8. dry with materialdried over Na2SO4
9. filtrationfiltered
10. concentrationconcentrated
11. customThe crude product was purified by column chromatography on silica gel (petroleum ether/ethyl acetate, 50:1, v/v)