反应详情

A solution of tert-butyl 2-hydroxyimino-3-oxobutyrate (130 g), aniline (76 ml) and acetic acid (14 ml) in benzene (1.2 l) was refluxed with Dean Stark water separator for 5 hours. The resulting solution was cooled and washed with 5% aqueous sodium bicarbonate solution and water. After being dried over magnesium sulfate, the organic solvent was evaporated in vacuo. The residue was triturated with a mixture of n-hexane (300 ml) and diisopropyl ether (100 ml). The precipitate was collected by filtration, washed with n-hexane to give tert-butyl 2-hydroxyimino-3-phenyliminobutyrate (71.2 g).

1. temperatureThe resulting solution was cooled
2. washwashed with 5% aqueous sodium bicarbonate solution and water
3. dry with materialAfter being dried over magnesium sulfate
4. customthe organic solvent was evaporated in vacuo
5. customThe residue was triturated with a mixture of n-hexane (300 ml) and diisopropyl ether (100 ml)
6. filtrationThe precipitate was collected by filtration
7. washwashed with n-hexane