反应详情

A mixture of 4-(2,3-dichlorobenzyl)-3-methyl-1H-pyrazol-5-amine (1.21 g, 4.72 mmol), ethyl 3-oxo-3-(pyridin-4-yl)propanoate (1.004 g, 5.195 mmol) in acetic acid (50 mL) was stirred under reflux overnight. After cooled to room temperature, the mixture was concentrated. The residue was diluted with ethyl acetate (20 mL). The resulting precipitate was filtered, washed with ethyl acetate, dried in vacuo to give the titled product (1.266 g, 60%); LC/MS: MS (ES+) m/e 385 (MH+); 1H NMR (300 MHz, DMSO-d6) δ ppm 1.91 (s, 3H), 2.12 (s, 3H), 4.16 (s, 2H), 6.10 (s, 1H), 6.91 (dd, J=1.2, 7.8 Hz, 1H), 7.26 (t, J=7.8 Hz, 1H), 7.51 (dd, J=1.2, 7.8 Hz, 1H), 7.77 (d, J=5.7 Hz, 2H), 8.77 (d, J=5.7 Hz, 2H), 11.94 (s, 1H), 12.18 (s, 1H).

1. temperatureunder reflux overnight
2. concentrationthe mixture was concentrated
3. additionThe residue was diluted with ethyl acetate (20 mL)
4. filtrationThe resulting precipitate was filtered
5. washwashed with ethyl acetate
6. customdried in vacuo