反应详情

N,N-Diisopropylethylamine (0.29 mL, 1.7 mmol), piperazine-2,6-dione hydrochloride (88 mg, 0.58 mmol), EDCI (112 mg, 0.58 mmol) and HOBt (79 mg, 0.58 mmol) were successively added to a solution of 4-(4-ethyl-5-fluoro-2-methoxyphenoxy)-3-fluorobenzoic acid (which may be prepared in accordance with the experimental described in Example 4, step 4; 150 mg, 0.48 mmol) in dichloromethane (1.6 mL). The reaction mixture was stirred at room temperature overnight then diluted by addition of dichloromethane (20 mL) and a saturated solution of ammonium chloride (20 mL). After separation, the aqueous layer was extracted with dichloromethane (2×20 mL). The combined organic phases were washed with a saturated solution of sodium hydrogen carbonate (20 mL), dried over sodium sulfate, filtered and concentrated under vacuum. The residue was purified by chromatography on silica gel, using dichloromethane/methanol (95:5 to 90:10) as eluent. The title product was obtained as a beige solid (130 mg, 66%).

1. custommay be prepared in accordance with the
2. customAfter separation
3. extractionthe aqueous layer was extracted with dichloromethane (2×20 mL)
4. washThe combined organic phases were washed with a saturated solution of sodium hydrogen carbonate (20 mL)
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated under vacuum
8. customThe residue was purified by chromatography on silica gel