反应详情

To a solution of tert-butyl 2-methoxycarbonylmethoxyimino-3-oxobutyrate (syn isomer) (51.9 g) in glacial acetic acid (52 ml) was slowly added sulfuryl chloride (72.2 ml) at 40° C. with stirring. The reaction mixture was stirred at the same temperature for an hour. The resultant solution was concentrated under reduced pressure and the residual oil was dissolved in ethyl acetate (300 ml). The ethyl acetate layer was washed with 10% hydrochloric acid once and washed with a saturated aqueous solution of sodium chloride four times. The separated organic layer was dried over magnesium sulfate and concentrated under reduced pressure. The residual oil was diluted with n-hexane (100 ml) and evaporated under reduced pressure. The white crystalline precipitates were washed with diisopropyl ether (100 ml). The precipitates were collected by filtration, dried under reduced pressure to give crystalline 4-chloro-2-methoxycarbonylmethoxyimino-3-oxobutyric acid (syn isomer) (13.4 g), mp. 127° to 128.5° C.

1. customat 40° C.
2. stirringThe reaction mixture was stirred at the same temperature for an hour
3. concentrationThe resultant solution was concentrated under reduced pressure
4. dissolutionthe residual oil was dissolved in ethyl acetate (300 ml)
5. washThe ethyl acetate layer was washed with 10% hydrochloric acid once
6. washwashed with a saturated aqueous solution of sodium chloride four times
7. dry with materialThe separated organic layer was dried over magnesium sulfate
8. concentrationconcentrated under reduced pressure
9. additionThe residual oil was diluted with n-hexane (100 ml)
10. customevaporated under reduced pressure
11. customThe white crystalline precipitates
12. washwere washed with diisopropyl ether (100 ml)
13. filtrationThe precipitates were collected by filtration
14. customdried under reduced pressure