反应详情

温度

10 °C

To a 250 mL vessel, N-(4-(3-chloro-2-(diphenylmethyleneamino)pyridin-4-yloxy)-3-fluorophenyl)-4-ethoxy-1-(4-fluorophenyl)-2-oxo-1,2-dihydropyridine-3-carboxamide (100.0 g, 147.7 mmoles, 1.0 eq) and methanol (900 mL) were charged. The white slurry was cooled to 10° C. and concentrated HCl (16.3 g, 163.3 mmoles, 1.105 eq) was added, maintaining the reaction temperature below 10° C. The reaction mixture was held at 10° C. for approximately 2.5 h, until HPLC indicated 0.5 relative area percent of starting material. Water (500 mL) and MTBE (500 mL) were added and the reaction mixture was warmed to 20° C. Next, 1N NaOH (184.08 g, 177.0 mL, 177 mmoles, 1.20 eq), was added dropwise over 20 minutes while maintaining the temperature between 15 and 20° C. The resulting slurry was cooled to 10° C. and aged for at least 10 minutes. The precipitate was filtered off, and the cake washed with water (2×350 mL), followed by a mixture of methanol:MTBE (10:90) (1×300 mL). Next, the cake was dried in a vacuum oven at 50-60° C. until LOD analysis indicated less than 1 wt % of volatiles. N-(4-(2-amino-3-chloropyridin-4-yloxy)-3-fluorophenyl )-4-ethoxy-1-(4-fluorophenyl)-2-oxo-1,2-dihydropyridine-3-carboxamide: 79.5 g (95% yield with 98.1 AP and 99.4 wt % potency). The resulting product (35.0 g) was subsequently re-crystallized from THF (367.2 mL)/EtOH (200 proof, 244.8 mL)/n-heptane (350 mL) to obtain N-(4-(2-amino-3-chloropyridin-4-yloxy )-3-fluorophenyl)-4-ethoxy-1-(4-fluorophenyl)-2-oxo-1,2-dihydropyridine-3-carboxamide (30.8 g) in 88% yield with >99.9 AP and 99.7 wt % potency.

1. temperaturemaintaining the reaction temperature below 10° C
2. temperaturethe reaction mixture was warmed to 20° C
3. temperaturewhile maintaining the temperature between 15 and 20° C
4. temperatureThe resulting slurry was cooled to 10° C. and aged for at least 10 minutes
5. filtrationThe precipitate was filtered off
6. washthe cake washed with water (2×350 mL)
7. additionfollowed by a mixture of methanol:MTBE (10:90) (1×300 mL)
8. customNext, the cake was dried in a vacuum oven at 50-60° C. until LOD analysis
9. customThe resulting product (35.0 g) was subsequently re-crystallized from THF (367.2 mL)/EtOH (200 proof, 244.8 mL)/n-heptane (350 mL)