反应详情

A 500 mL round-bottom flask was charged with trifluoroacetaldehyde ethyl hemiacetal (12.3 g, 85.0 mmol), p-toluamide (10.0 g, 74.0 mmol), and dioxane (150 mL). The thick white slurry was stirred at ambient temperature for 3 hours, then heated at reflux for 44 hours. The homogeneous solution was cooled and concentrated in vacuo to provide a white solid. The crude material was dissolved in ethyl acetate (50 mL), adsorbed onto silica gel (50 g), and eluted through a medium porosity fritted filter funnel (elution with 25% ethyl acetate/hexanes, then ethyl acetate) to provide 14.1 g of the desired product as a white solid.

1. temperatureheated
2. temperatureat reflux for 44 hours
3. temperatureThe homogeneous solution was cooled
4. concentrationconcentrated in vacuo
5. customto provide a white solid
6. washeluted through a medium porosity fritted filter funnel (
7. washelution with 25% ethyl acetate/hexanes