反应详情

To a stirred mixture of 2-(5-pyrimidinyl)-2-propylamine (660 mg), ethanol (9 mL) and K2CO3 (665 mg) heated to reflux was added dropwise over 30 min, a solution of 1,1-dimethyl-4-oxopiperidinium iodide (1.9 g) in water (36 mL). When the addition was complete, the mixture was heated under reflux for an additional 2 h, cooled, basified to pH 10 with Na2CO3 and extracted with ethyl acetate (3 .Yen.100 mL). The combined organic extracts were dried over MgSO4 and concentrated under reduced pressure. Column chromatography over silica gel, eluting with a methylene chloride; 5% methanol gave 360 mg of 1-(2-(5-pyrimidinyl)-prop-2-yl)-4-oxopiperidine as an oil: 1H NMR (400 MHz, CDCl3) 9.13 (s, 1H), 8.95 (s, 2H), 2.79 (t, 4H), 2.44 (t, 4H), 1.47 (s, 6H).

1. temperatureheated
2. temperatureto reflux
3. additionwas added dropwise over 30 min
4. additionWhen the addition
5. temperaturethe mixture was heated
6. temperatureunder reflux for an additional 2 h
7. temperaturecooled
8. extractionextracted with ethyl acetate (3 .Yen.100 mL)
9. dry with materialThe combined organic extracts were dried over MgSO4
10. concentrationconcentrated under reduced pressure
11. washColumn chromatography over silica gel, eluting with a methylene chloride