反应详情

To a solution of methyl 4-fluoro-5-((2-fluoro-4-iodophenyl)amino)benzo[d]thiazole-6-carboxylate (10.34 g, 23.17 mmol) in THF and MeOH (20 mL, 4:1, v/v) was added 5.0 M LiOH (aq., 2 mL, 10 mmol). After stirring at ambient temperature for 2 h, the reaction was treated with 1.0 M 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 (9.51 g, 95.0% yield). 1H NMR (400 MHz, DMSO-d6): δ 11.10 (s, 1H), 9.18 (s, 1H), 8.68 (s, 1H), 8.45 (s, 1H), 7.41 (m, 1H), 7.30 (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