反应详情

温度

25 °C

A suspension of dimethyl 2,6-pyridine-dicarboxylate (50 g, 0.25 mol) in methanol (400 mL) and tetrahydrofuran (150 mL) was heated to dissolve and while the solution was still hot, it was treated in portions with sodium borohydride (9.1 g, 0.24 mol). The mixture was stirred for 1 hour after the addition, cooled to 25° C., quenched with 10% citric acid (80 mL), stirred for 15 minutes, filtered, and concentrated. A solution of the concentrate in dichloromethane was dried over sodium sulfate, filtered, and concentrated. A solution of the residue in hot ethyl acetate was allowed to stand for 16 hours at 25° C. The resulting precipitate (23 g) was collected by filtration. The mother liquor was concentrated and the resulting solid was purified by flash chromatography on silica gel eluting with 10% methanol in dichloromethane to give the crude white solid (24 g). The solid was crystallized in ethyl acetate to give a total yield of the title compound (36 g, 84% yield).

1. temperaturewas heated
2. dissolutionto dissolve and while the solution
3. additionafter the addition
4. customquenched with 10% citric acid (80 mL)
5. stirringstirred for 15 minutes
6. filtrationfiltered
7. concentrationconcentrated
8. concentrationA solution of the concentrate in dichloromethane
9. dry with materialwas dried over sodium sulfate
10. filtrationfiltered
11. concentrationconcentrated
12. waitto stand for 16 hours at 25° C
13. filtrationThe resulting precipitate (23 g) was collected by filtration
14. concentrationThe mother liquor was concentrated
15. customthe resulting solid was purified by flash chromatography on silica gel eluting with 10% methanol in dichloromethane
16. customto give the crude white solid (24 g)
17. customThe solid was crystallized in ethyl acetate