反应详情

温度

-78 °C

A solution containing 12.6 g (125 mmol) of diisopropylamine in 90 ml of dry tetrahydrofuran was cooled to -78° C. and 52.4 ml of 2.5M n-butyllithium (131 mmol) was added. A solution of 14.5 g (125 mmol) of t-butyl acetate in 10 ml of tetrahydrofuran was then added dropwise over a 30 min period with stirring and allowed to react for another 30 min at -78° C. A solution of 6.00 g (56.6 mmol) of ethyl fluoroacetate in tetrahydrofuran was added dropwise with stirring to the resultant pale yellow solution and the mixture allowed to react for another 30 min at -78° C. and then allowed to stir and warm to ambient temperature over one hour. The resulting pale yellow solution was diluted with 250 ml of ether and the ethereal solution was extracted with 250 ml of 1N HCl, 250 ml of water, and 250 ml of saturated aqueous sodium bicarbonate. The solution was then dried over magnesium sulfate and distilled at atmospheric pressure to remove the solvents. The residue was fractionally distilled under reduced pressure from a based-washed and oven-dried flask containing a few potassium bicarbonate crystals to obtain 7.00 g (70 percent of theory) of the desired product as a colorless oil boiling at 72°-74° C. at 10 torr. The proton and fluorine nmr spectra were consistent with the assigned structure.

1. customto react for another 30 min at -78° C
2. stirringwith stirring to the resultant pale yellow solution
3. customto react for another 30 min at -78° C.
4. stirringto stir
5. temperaturewarm to ambient temperature over one hour
6. extractionthe ethereal solution was extracted with 250 ml of 1N HCl, 250 ml of water, and 250 ml of saturated aqueous sodium bicarbonate
7. dry with materialThe solution was then dried over magnesium sulfate
8. distillationdistilled at atmospheric pressure
9. customto remove the solvents
10. distillationThe residue was fractionally distilled under reduced pressure from
11. washa based-washed
12. customoven-dried flask
13. additioncontaining a few potassium bicarbonate crystals