反应详情

Potassium carbonate (930 mg, 2 eq) and a solution of 1-butylamine (300 mg, 1.2 eq) in acetonitrile (2 ml) are added successively to a solution of 6-chloro-3-nitro-N-(3-piperidin-1-ylpropyl)pyridin-2-amine (1 g, 1 eq; prepared according to Example A2) in acetonitrile (80 ml). The mixture is heated to reflux for 15 hours then cooled down to ambient temperature and concentrated under reduced pressure at 40° C. The residue is taken up in dichloromethane (200 ml) and water (90 ml). After decantation and extractions, the combined organic phases are washed with salt water, dried over Na2SO4 then concentrated under reduced pressure at 40° C. Purification of the residue obtained, by flash chromatography on silica gel (eluent: heptane/ethyl acetate 9:1 to 100% ethyl acetate), produces the expected compound (1.1 g; 98% yield).

1. temperatureThe mixture is heated
2. temperatureto reflux for 15 hours
3. concentrationconcentrated under reduced pressure at 40° C
4. extractionAfter decantation and extractions
5. washthe combined organic phases are washed with salt water
6. dry with materialdried over Na2SO4
7. concentrationthen concentrated under reduced pressure at 40° C
8. customPurification of the residue
9. customobtained, by flash chromatography on silica gel (eluent: heptane/ethyl acetate 9:1 to 100% ethyl acetate)