反应详情

温度

-5 °C

An oily suspension (50% by weight; 0.5 g) of sodium hydride is added in small portions at a temperature in the region of -5° C. to a solution, maintained under an argon atmosphere, of 3-hydroxy-2-(7-methoxy-1,8-naphthyridin-2-yl)-1-isoindolinone (1.6 g) in anhydrous dimethylformamide (20 cc), and the suspension obtained is stirred for 30 minutes at a temperature in the region of -5° C. A solution of 5-methyl-2-hexanone (1.2 g) in anhydrous dimethylformamide (5 cc) is then added and stirring is continued for 5 hours at a temperature in the region of 20° C. The reaction mixture is then poured into distilled water (200 cc) and extracted with dichloromethane (3×100 cc). The organic phases are combined, washed with distilled water (5×20 cc) and then concentrated to dryness under reduced pressure (2.7 kPa) at 40° C. The oily residue obtained is purified by chromatography on silica gel (15 g) contained in a column 1.5 cm in diameter [eluent: dichloromethane/methanol (99:1 by volume)]. Elution is first performed with 30 cc of solvent: the corresponding eluate is discarded; elution is then performed with 100 cc of solvent: the corresponding eluate is concentrated to dryness under reduced pressure (2.7 kPa) at 40° C. The residue obtained is recrystallized in ethyl acetate; 2-(7-methoxy-1,8-naphthyridin-2-yl)-3-(5-methyl-2-oxohexyl)-1-isoindolinone (1.3 g), m.p. 150° C., is thereby obtained.

1. customthe suspension obtained
2. stirringstirring
3. waitis continued for 5 hours at a temperature in the region of 20° C
4. additionThe reaction mixture is then poured
5. distillationinto distilled water (200 cc)
6. extractionextracted with dichloromethane (3×100 cc)
7. washwashed with distilled water (5×20 cc)
8. concentrationconcentrated to dryness under reduced pressure (2.7 kPa) at 40° C
9. customThe oily residue obtained
10. customis purified by chromatography on silica gel (15 g)
11. washElution
12. washelution
13. concentrationthe corresponding eluate is concentrated to dryness under reduced pressure (2.7 kPa) at 40° C
14. customThe residue obtained
15. customis recrystallized in ethyl acetate