反应详情

To a solution of methyl 4-fluoro-5-((4-bromo-2-chlorophenyl)amino)benzo[d]thiazole-6-carboxylate (8.74 g, 21.02 mmol) in THF and MeOH (20 mL, 4:1, v/v) was added 5.0 M LiOH (aq., 9.5 mL). After stirring at ambient temperature for 2 h, the reaction was treated with 10% HCl (aq.) till the solution was acidic. The aqueous layer was extracted with ethyl acetate (50 mL×3). The combined organic phase was washed with water (100 mL) and brine (100 mL) sequentially, dried over Na2SO4, filtered and concentrated to give the desired product (8.08 g, 95.7% yield). 1H NMR (400 MHz, DMSO-d6): δ 11.09 (s, 1H), 9.18 (s, 1H), 8.71 (s, 1H), 8.47 (s, 1H), 7.44 (m, 1H), 7.31 (m, 1H), 6.65 (m, 1H).

1. extractionThe aqueous layer was extracted with ethyl acetate (50 mL×3)
2. washThe combined organic phase was washed with water (100 mL) and brine (100 mL) sequentially
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated