反应详情

温度

60 °C

To a stirred solution of methyl 3,6-dichloropyridine-2-carboxylate (0.96 g, 4.66 mmol) in TFA (5 ml) was added hydrogen peroxide (30% w/w aqueous solution, 435 μl, 2.5 mmol) and the reaction mixture was heated at 60° C. for 20 h. The reaction mixture was then cooled and slowly poured onto saturated K2CO3 solution (100 ml), followed by extraction of the aqueous layer with EtOAc (2×200 ml), washing of the combined organic phases with brine (2×50 ml), drying (Na2SO4) and evaporation. The desired 3,6-dichloro-2-(methoxycarbonyl)pyridin-1-ium-1-olate was used crude in the next stage of the synthesis without any further purification. To the crude 3,6-dichloro-2-(methoxycarbonyl)pyridin-1-ium-1-olate (˜70% purity, 2.40 g, 7.7 mmol) was added POCl3 (3.5 ml, 38 mmol) and the solution was heated to 100° C. for 4 h. After cooling the POCl3 was removed in vacuo to give a white solid which was chromatographed over silica gel eluting with 0% to 10% of EtOAc in heptane to afford the title compound as colourless needles (340 mg, 30% over two steps). LC-MS 100%, 2.20 min (3.5 minute LC-MS method), m/z=239.8/241.7, 1H NMR (500 MHz, Chloroform-d) δ 7.51 (1H, s), 3.92 (3H, s).

1. temperatureThe reaction mixture was then cooled
2. extractionfollowed by extraction of the aqueous layer with EtOAc (2×200 ml)
3. washwashing of the combined organic phases with brine (2×50 ml)
4. customdrying
5. custom(Na2SO4) and evaporation
6. customin the next stage of the synthesis
7. customwithout any further purification
8. temperaturethe solution was heated to 100° C. for 4 h
9. customwas removed in vacuo
10. customto give a white solid which
11. customwas chromatographed over silica gel eluting with 0% to 10% of EtOAc in heptane