反应详情

Add potassium carbonate (63.50 g, 459 mmol) to a stirred solution of N-benzylmethylamine (14.8 mL, 115 mmol), 3-bromo-N-methoxy-N-methyl-propionamide (22.47 g, 115 mmol, prepared according to Jacobi, P. A.; Blum, C. A.; DeSimone, R. W.; Udodong, U. E. S. J. Am. Chem. Soc. 1991, 113, 5384-5392), and anhydrous acetonitrile (460 mL). Heat the reaction to reflux under nitrogen for 3 hours. Cool the reaction to room temperature and filter the reaction through Celite®. Wash the Celite® with ethyl acetate and concentrate on a rotary evaporator to give the crude product. Purify the crude product by flash chromatography on silica gel eluting with 0.5% concentrated ammonium hydroxide/5% ethanol/chloroform to yield 22.31 g (82%) of 3-(benzyl-methyl-amino)-N-methoxy-N-methyl-propionamide: mass spectrum (ion spray) m/z=237.1(M+1); 1H NMR (CDCl3) δ 7.31-7.21 (m, 5H), 3.65 (s, 3H), 3.53 (s, 2H), 3.17 (s, 3H), 2.80-2.76 (m, 2H), 2.67-2.63 (m, 2H), 2.23 (s, 3H).

1. customprepared
2. temperatureHeat
3. customthe reaction
4. temperatureto reflux under nitrogen for 3 hours
5. temperatureCool
6. customthe reaction to room temperature
7. filtrationfilter
8. customthe reaction through Celite®
9. washWash the Celite® with ethyl acetate
10. concentrationconcentrate on a rotary evaporator
11. customto give the crude product
12. customPurify the crude product by flash chromatography on silica gel eluting with 0.5% concentrated ammonium hydroxide/5% ethanol/chloroform