反应详情

5-((Azetidin-3-yloxy)methyl)thiazole hydrochloride (113 mg, 0.54 mmol), EDCI (121 mg, 0.63 mmol), HOBt (87.7 mg, 0.63 mmol) and diisopropylethylamine (183 μL, 1.05 mmol) were successively added to a solution of (E)-3-(7-oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)-acrylic acid hydrochloride (107 mg, 0.42 mmol) in dimethylformamide (10 mL) at room temperature. The reaction mixture was stirred overnight then partitioned between ethyl acetate (30 mL) and water (20 mL). The aqueous layer was separated and extracted with ethyl acetate (2×20 mL). The combined organic phases were washed with a saturated solution of sodium chloride (3×30 mL), dried over sodium sulfate, filtered and concentrated to dryness. The residue was purified by chromatography on silica gel using dichloromethane/methanol (10:0 to 98:2) as eluent then on C18 using dichloromethane/methanol (98:2) as eluent. In order to reach the required purity, the residue was finally recrystallized in methanol to afford the title product as a white solid (2.8 mg, 2%).

1. customthen partitioned between ethyl acetate (30 mL) and water (20 mL)
2. customThe aqueous layer was separated
3. extractionextracted with ethyl acetate (2×20 mL)
4. washThe combined organic phases were washed with a saturated solution of sodium chloride (3×30 mL)
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated to dryness
8. customThe residue was purified by chromatography on silica gel
9. customthe residue was finally recrystallized in methanol