反应详情

Sodium hydride (0.12 g, 3.07 mmol) was added to a solution of tert-butyl 5-(2-chloro-4-nitroimidazol-1-yl)-4-hydroxy-4-methylpentanoate prepared in Example 43 (0.93 g, 2.79 mmol) in 1,4-dioxane (10 ml) with cooling on ice-bath followed by stirring under reflux for 7.5 hours. The reaction mixture was concentrated under reduced pressure. Water was added to the solution, and the resulting mixture was extracted with methylene chloride. The organic phase was dried over magnesium sulfate and then concentrated under reduced pressure. The residue was treated with diethyl ether to afford tert-butyl 3-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-yl)propionate (0.35 g, 42%) as a white solid.

1. temperaturewith cooling on ice-bath
2. temperatureunder reflux for 7.5 hours
3. concentrationThe reaction mixture was concentrated under reduced pressure
4. additionWater was added to the solution
5. extractionthe resulting mixture was extracted with methylene chloride
6. dry with materialThe organic phase was dried over magnesium sulfate
7. concentrationconcentrated under reduced pressure
8. additionThe residue was treated with diethyl ether