反应详情

To a solution of methyl 4-fluoro-5-((2-fluorophenyl)amino)benzo[d]thiazole-6-carboxylate (1.963 g, 6.14 mmol) in DMF (10 mL) was added NIS (1.5 g, 6.5 mmol) followed by trifluoroacetic acid (0.5 mL). After stirring for 4 h at ambient temperature, the reaction was treated by saturated NH4Cl (aq.). The aqueous layer was extracted with ethyl acetate (150 mL×3). The combined organic layer was washed with water (100 mL×3) and brine (100 mL) sequentially, dried over Na2SO4, filtered and concentrated in vacuo. After purification by flash column chromatography on silica gel (petroleum ether/ethyl acetate, 10:1, v/v), the desired product was obtained as white solid (1.889 g, 69% yield). 1H NMR (400 MHz, DMSO-d6): δ 9.03 (s, 1H), 8.10 (s, 1H), 7.93 (s, 1H), 7.18-6.72 (m, 3H), 3.91 (s, 3H).

1. extractionThe aqueous layer was extracted with ethyl acetate (150 mL×3)
2. washThe combined organic layer was washed with water (100 mL×3) and brine (100 mL) sequentially
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customAfter purification by flash column chromatography on silica gel (petroleum ether/ethyl acetate, 10:1