反应详情

A stirred mixture of 1-(4-hydroxy-3-nitrophenyl)ethanone (3.00 g, 16.56 mmol), ethylene glycol (1.385 mL, 24.84 mmol) and p-toluenesulfonic acid monohydrate (0.158 g, 0.828 mmol) in toluene (60 mL) was heated to reflux for 18 hr in a 250 mL round bottom flask fitted with a Dean-Stark apparatus. The mixture was cooled and diluted with EtOAc (80 mL) and then washed with water (3×30 mL) and brine (20 mL), dried (Na2SO4) and concentrated to dryness in vacuo to afford a thick brown oily residue. This was purified by silica gel chromatography eluting with 5-50% Et2O in isohexane. The title product was isolated as a yellow oil (2.41 g, 64.6%).

1. temperaturewas heated
2. temperatureto reflux for 18 hr in a 250 mL round bottom flask
3. customfitted with a Dean-Stark apparatus
4. temperatureThe mixture was cooled
5. washwashed with water (3×30 mL) and brine (20 mL)
6. dry with materialdried (Na2SO4)
7. concentrationconcentrated to dryness in vacuo
8. customto afford a thick brown oily residue
9. customThis was purified by silica gel chromatography
10. washeluting with 5-50% Et2O in isohexane