反应详情

温度

40 °C

To a solution of 3-(5-methylpyridin-2-yl)-5-[(5R)-5-pyridin-2-yl-4,5-dihydroisoxazol-3-yl]benzoic acid trifluoracetate salt (1.14 g, 1.94 mmol) in N,N-dimethylformamide (10 mL) were added (1R)-1-(5-fluoropyridin-2-yl)ethanamine hydrochloride salt (0.62 g, 2.91 mmol), EDC (0.74 g, 3.88 mmol), HOAT (0.26 g, 1.94 mmol) and triethylamine (1.89 mL, 13.6 mmol). The reaction mixture was heated to 40° C. After 1.5 h, additional (1R)-1-(5-fluoropyridin-2-yl)ethanamine hydrochloride salt (0.29 g, 1.36 mmol), EDC (0.37 g, 1.94 mmol), HOAT (0.13 g, 0.97 mmol) and triethylamine (0.54 mL, 3.88 mmol) were added. After 2 h, the mixture was cooled to ambient temperature and water was added. The mixture was extracted with ethyl acetate (3×). The combined organic extracts were washed with water (3×), brine, dried over sodium sulfate, filtered and concentrated. Purification by silica gel chromatography (100% dichloromethane→95% dichloromethane/methanol) gave the title compound (820 mg). The title compound was dissolved in dichloromethane and HCl (2.0 M in ether) was added. The mixture was concentrated gave the hydrochloride salt of the title compound. HRMS 482.2014 (M+1). 1H NMR (400 MHz, CD3OD): δ 8.82 (d, J=5.8 Hz, 1H); 8.75 (s, 1H); 8.68-8.49 (m, 6H); 8.42 (d, J=8.4 Hz, 1H); 8.19 (d, J=8.1 Hz, 1H); 8.07-8.00 (m, 2H); 7.92 (dd, J=8.9, 4.6 Hz, 1H); 6.28 (dd, J=11.6, 6.8 Hz, 1H); 5.36 (q, J=7.1 Hz, 1H); 4.30 (dd, J=17.4, 11.7 Hz, 1H); 3.98 (dd, J=17.4, 6.8 Hz, 1H); 2.61 (s, 3H); 1.70 (d, J=7.1 Hz, 3H).

1. waitAfter 2 h
2. temperaturethe mixture was cooled to ambient temperature
3. extractionThe mixture was extracted with ethyl acetate (3×)
4. washThe combined organic extracts were washed with water (3×), brine
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. customPurification by silica gel chromatography (100% dichloromethane→95% dichloromethane/methanol)