反应详情

To a solution of 3-(5-methylpyridin-2-yl)-5-[(5S)-5-pyridin-2-yl-4,5-dihydroisoxazol-3-yl]benzoic acid (2.9 g, 5.57 mmol) in N,N-dimethylformamide (28 mL) were added (1R)-1-[6-(trifluoromethyl)pyridin-3-yl]etanamine hydrochloride salt (1.52 g, 6.69 mmol), EDC (1.60 g, 8.36 mmol), HOAT (190 mg, 1.39 mmol) and triethylamine (3.1 mL, 22.3 mmol). The reaction mixture was stirred at ambient temperature. After 2 h, the mixture was heated to 50° C. After 1 h, the mixture was cooled to ambient temperature and saturated aqueous sodium bicarbonate was added. The mixture was extracted with dichloromethane (3×). The combined organic extracts were washed with brine, dried over magnesium sulfate, filtered and concentrated. Ethyl acetate (200 mL) was added the mixture was heated to 70° C. The solution was cooled and placed in the refrigerator for product to precipitate out. The precipiatated solid was filtered, washed with cold ethyl acetate and dried under reduced pressure gave the title compound (2.17 g). HRMS 532.1972 (M+1). 1H NMR (500, MHz, CDCl3) δ 8.80 (s, 1H), 8.61-8.60 (d, J=4.9 Hz, 1H), 8.51 (s, 1H), 8.45-8.44 (m, 2H), 8.15 (t, J=1.5 Hz, 1H), 7.91-7.89 (m, 1H), 7.74-7.71 (dd, J=7.8, 6.1 Hz, 2H), 7.68-7.67 (d, J=8.1 Hz, 1H), 7.62-7.60 (m, 1H), 7.57-7.55 (d, J=7.8 Hz, 1H), 7.25-7.23 (m, 1H), 6.69-6.67 (d, J=6.8 Hz, 1H), 5.93-5.89 (dd, J=9.9, 7.9 Hz, 1H), 5.44-5.38 (m, 1H), 3.94-3.86 (m, 2H), 2.4 (s, 3H), 1.70-1.68 (d, J=7.1 Hz, 3H).

1. temperaturethe mixture was heated to 50° C
2. waitAfter 1 h
3. temperaturethe mixture was cooled to ambient temperature
4. extractionThe mixture was extracted with dichloromethane (3×)
5. washThe combined organic extracts were washed with brine
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated
9. additionEthyl acetate (200 mL) was added the mixture
10. temperaturewas heated to 70° C
11. temperatureThe solution was cooled
12. customto precipitate out
13. filtrationThe precipiatated solid was filtered
14. washwashed with cold ethyl acetate
15. customdried under reduced pressure