反应详情

3-Amino-6-chloropyridazine (1.29 g, 10 mmol) was suspended in dry toluene (20 ml) and dimethylacetamide dimethyl acetal (1.46 ml, 10 mmol) was added. The mixture was stirred and heated at reflux for 3 hours and then left to stand at ambient temperature for 18 hours. Insolubles were removed from the reaction mixture by filtration and the filter washed with ethyl acetate. The filtrate was then evaporated and the residue triturated with isohexane, the solid product collected by filtration and washed with isohexane to give the title compound (1.7 g, 85%) as a yellow solid. NMR: (CDCl3) 2.13 (s, 3H), 3.1 (s, 6H), 6.92 (d, 1H), 7.25 (d, 1H); m/z: 199 [MH]+.

1. temperatureheated
2. temperatureat reflux for 3 hours
3. waitleft
4. customInsolubles were removed from the reaction mixture by filtration
5. washthe filter washed with ethyl acetate
6. customThe filtrate was then evaporated
7. customthe residue triturated with isohexane
8. filtrationthe solid product collected by filtration
9. washwashed with isohexane