反应详情

温度

50 °C

N-Methyl-hydroxyguanidine sulphate (17.0 g, 0.061 mol) was stirred with 4A molecular sieves (20 g) in ethanol (80 mL) under a nitrogen atmosphere for 2 hours. Sodium (2.8 g, 0.122 mol) was added in portions then the mixture was stirred at 50° C. for 1 hour. A solution of methyl 1-t-butyloxycarbonyl-1,2,5,6-tetrahydropyridine-3-carboxylate (3.0 g, 0.012 mol) in ethanol (40 mL) was added and the reaction mixture was stirred whilst heating under reflux for 4 hours. The mixture was cooled, filtered, evaporated to dryness. The residue was dissolved in tetrahydrofuran (40 mL), treated with potassium t-butoxide (1.35 g, 0.012 mol) and stirred for 3 hours. Water (50 mL) was added and the mixture extracted with dichloromethane (5×50 mL). The combined organics were dried (sodium sulphate) then evaporated to dryness to give a yellow gum which was purified by column chromatography on silica using dichloromethane/methanol (80:1) afford the product as a pale yellow gum (1.10 g, 33%). (HRMS, Found: M+, 280.1530, C13H20N4O3 requires M, 280.1535). (Found: C, 54.70; H, 7.29; N, 18.91. C13H20N4O3 requires C, 55.70; H, 7.19, N, 19.99%).

1. stirringthe reaction mixture was stirred
2. temperaturewhilst heating
3. temperatureunder reflux for 4 hours
4. temperatureThe mixture was cooled
5. filtrationfiltered
6. customevaporated to dryness
7. dissolutionThe residue was dissolved in tetrahydrofuran (40 mL)
8. stirringstirred for 3 hours
9. extractionthe mixture extracted with dichloromethane (5×50 mL)
10. dry with materialThe combined organics were dried (sodium sulphate)
11. customthen evaporated to dryness
12. customto give a yellow gum which
13. customwas purified by column chromatography on silica