Reaktion #1944126

Reaktionsgleichung

2-[(3,4-dimethoxyphenyl)methylene]-6-hydroxy-3(2H)-benzofuranone

potassium carbonate

dimethylformamide

2-bromopropane

→

desired compound

Ausbeute 109.1%

2-[(3,4-dimethoxyphenyl)methylene]-6-isopropyloxy-3(2H)-benzofuranone

Ausbeute 109.1%

Lösungsmittel

hexane

water

ethyl acetate

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter the mixture was refluxed for 2.5 hours
2. 2
   ExtraktionThe resulting compound was extracted with ethyl acetate 30 ml twice
3. 3
   WaschenThe ethyl acetate solution was washed with a saturated sodium chloride solution 50 ml twice
4. 4
   Einengenconcentrated under reduced pressure
5. 5
   WaschenThe residue was fractionated by silica gel column chromatography (silica gel: 50 g, eluted with solvent 500 ml of hexane:ethyl acetate=1:1)
6. 6
   Einengenthe fraction was concentrated to dryness at a temperature of 40° C. under reduced pressure
7. 7
   Sonstigeto obtain crystals
8. 8
   FiltrationThe precipitated crystals were filtered
9. 9
   Trocknendried over phosphorous pentoxide at a temperature of 60° C. for four hours under reduced pressure

Vorschrift

To a solution of 2-[(3,4-dimethoxyphenyl)methylene]-6-hydroxy-3(2H)-benzofuranone 0.5 g, potassium carbonate 0.58 g and dimethylformamide 5 ml, 2-bromopropane 0.306 g was added. After the mixture was refluxed for 2.5 hours, water 50 ml was added. The resulting compound was extracted with ethyl acetate 30 ml twice. The ethyl acetate solution was washed with a saturated sodium chloride solution 50 ml twice, dehydrated with anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was fractionated by silica gel column chromatography (silica gel: 50 g, eluted with solvent 500 ml of hexane:ethyl acetate=1:1) and the fraction was concentrated to dryness at a temperature of 40° C. under reduced pressure to obtain crystals. The crystals were dissolved in ethyl acetate 2 ml and hexane 5 ml, and the solution was allowed to stand at room temperature for four hours. The precipitated crystals were filtered and dried over phosphorous pentoxide at a temperature of 60° C. for four hours under reduced pressure to obtain the desired compound 622.7 mg.

Quelle