反应详情

4-(4-Chlorophenyl)-4-oxobutanoic acid (10 g, 47.03 mmol), methoxylamine hydrochloride (4.91 g, 58.79 mmol) and sodium carbonate (5.98 g, 56.44 mmol) in ethanol (150 mL) were stirred for 4 hrs at 80° C. The mixture was then cooled to room temperature before being filtered. The filtrate was concentrated by evaporation and purified by flash silica chromatography (eluent 20-50% EtOAc/iso-hexane). Pure fractions were evaporated to dryness to afford ethyl 4-(4-chlorophenyl)-4-(methoxyimino)butanoate (12.33 g, 97%) as an orange transparent liquid.

1. filtrationbefore being filtered
2. concentrationThe filtrate was concentrated by evaporation
3. custompurified by flash silica chromatography (eluent 20-50% EtOAc/iso-hexane)
4. customPure fractions were evaporated to dryness