反应详情

To a solution of trans-4,4,4-trifluoro-2-buten-1-yl acetoacetate (13.7 g, 65.1 mmol) and triethylamine (11.7 mL, 84 mmol) in anhydrous acetonitrile (60 mL), a solution of p-acetamidobenzenesulfonyl azide (20.1 g, 84 mmol) in anhydrous acetonitrile (60 mL) was added dropwise over a period of 30 minutes. A white precipitate was observed after 15-20 minutes and additional acetonitrile (100 mL) was added to facilitate stirring. The resulting mixture was stirred at room temperature for one additional hour. Then, a solution of lithium hydroxyde (9.0 g, 214 mmol) in water (75 mL) was added to the reaction mixture. After stirring for one hour, the resulting mixture was poured onto 2:1 diethylether:ethyl acetate (150 mL) and layers were separated. Aqueous layer was extracted with 2:1 diethylether:ethyl acetate (150 mL) and the combined organic phases were washed with a saturated aqueous sodium chloride solution (50 mL). The resulting organic solution was dried over sodium sulfate, filtered and the solvent removed under reduced pressure. The residue was purified by column chromatography using a mixture 4:1 of hexane and ethyl acetate as eluent to afford 9.4 g (75% yield) of trans-4,4,4-trifluoro-2-buten-1-yl diazoacetate as a yellow oil.

1. stirringThe resulting mixture was stirred at room temperature for one additional hour
2. stirringAfter stirring for one hour
3. customethyl acetate (150 mL) and layers were separated
4. extractionAqueous layer was extracted with 2:1 diethylether
5. washethyl acetate (150 mL) and the combined organic phases were washed with a saturated aqueous sodium chloride solution (50 mL)
6. dry with materialThe resulting organic solution was dried over sodium sulfate
7. filtrationfiltered
8. customthe solvent removed under reduced pressure
9. customThe residue was purified by column chromatography