Reaktion #42749

Reaktionsgleichung

7-amino-3-(4-chlorophenyl)-8-hydroxy-2-isopropyl-chromen-4-one

sodium formate

→

title compound

N-[3-(4-Chlorophenyl)-8-hydroxy-2-isopropyl-4-oxo-4H-chromen-7-yl]formamide

Lösungsmittel

formic acid

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturis heated
2. 2
   Temperaturunder reflux for 2 h
3. 3
   WaschenThe resulting aqueous suspension is washed with ethyl acetate (2×100 ml)
4. 4
   WaschenThe combined organic layers are washed with water (3×100 ml) and brine (100 ml)
5. 5
   Trocknendried (magnesium sulfate)
6. 6
   Filtrationfiltered
7. 7
   SonstigeThe solvent is removed by evaporation in vacuo
8. 8
   Sonstigeto afford a dark brown oil
9. 9
   SonstigeThis is purified by flash chromatography (hexane/ethyl acetate=1:1, followed by 100% ethyl acetate)

Vorschrift

A stirred mixture of 7-amino-3-(4-chlorophenyl)-8-hydroxy-2-isopropyl-chromen-4-one (1.1 g, 3.35 mmol) and sodium formate (0.23 g, 3.35 mmol) in formic acid (50 ml) is heated under reflux for 2 h. After cooling to room temperature, the reaction mixture is poured into ice/water (300 ml) with stirring. The resulting aqueous suspension is washed with ethyl acetate (2×100 ml). The combined organic layers are washed with water (3×100 ml) and brine (100 ml), dried (magnesium sulfate) and filtered. The solvent is removed by evaporation in vacuo to afford a dark brown oil. This is purified by flash chromatography (hexane/ethyl acetate=1:1, followed by 100% ethyl acetate) to afford the title compound.

Quelle