反应详情

3.5 ml of acetic anhydride and 1.1 ml of ethyl orthoformate were added to 1.40 g (0.005 mole) of ethyl 3-methoxy-2,4,5-trifluorobenzoylacetate (XXIX) [prepared as described in Step (E9) above], and the mixture was heated under reflux for 1 hour and then concentrated by evaporation under reduced pressure. 0.38 g (0.006 mole) of cyclopropylamine was added dropwise, whilst ice-cooling and stirring, to a solution of the residue in 10 ml of methylene chloride, and the mixture was stirred for a further 30 minutes. The solvent was then removed by evaporation under reduced pressure from the reaction mixture, and the residue was subjected to silica gel column chromatography eluted with a 9:1 by volume mixture of toluene and ethyl acetate, to afford 1.23 g of ethyl 3-cyclopropylamino-2-(3-methoxy-2,4,5-trifluorobenzoyl)acrylate (XXXI) as a pale brown oily substance.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 1 hour
3. concentrationconcentrated by evaporation under reduced pressure
4. temperaturecooling
5. customThe solvent was then removed by evaporation under reduced pressure from the reaction mixture
6. washeluted with a 9:1 by volume mixture of toluene and ethyl acetate