Potassium Carbonate → 2-[4-(Sec-butyloxy)-phenoxymethyl]-5-bromothiophene
Reaktionsgleichung
[CH:1]([O:5][C:6]1[CH:11]=[CH:10][C:9]([OH:12])=[CH:8][CH:7]=1)([CH2:3][CH3:4])[CH3:2].C(=O)([O-])[O-].[K+].[K+].[Br:19][C:20]1[S:24][C:23]([CH2:25]Cl)=[CH:22][CH:21]=1>CN(C)C=O>[CH:1]([O:5][C:6]1[CH:7]=[CH:8][C:9]([O:12][CH2:25][C:23]2[S:24][C:20]([Br:19])=[CH:21][CH:22]=2)=[CH:10][CH:11]=1)([CH2:3][CH3:4])[CH3:2]Komponenten
Reaktionsbedingungen
- Temperatur
- 20 °C
Versuchsvorschrift
6.64 g of 4-(sec-butyloxy)-phenol and 5.52 g of potassium carbonate are heated in 50 ml of anhydrous dimethylformamide for one hour at 70° C. Subsequently, 8.46 g of 5-bromo-2-chloromethylthiophene in 20 ml anhydrous dimethylformamide is dripped in. The mixture is stirred for 6 hours at 80° C. and overnight at room temperature (about 20° C.). It is then poured into 100 ml of ice water and extracted three times with ethyl acetate, and the organic phases are dried over magnesium sulfate. The solvent is evaporated off to give a crude product which is purified by chromatography on silica gel using n-hexane/ethyl acetate (4:1) as eluant. There is obtained 6.3 g of 2-[4-(sec-butyloxy)-phenoxymethyl]-5-bromothiophene as a colorless oil.
Aufarbeitung
- extractionextracted three times with ethyl acetate
- dry with materialthe organic phases are dried over magnesium sulfate
- customThe solvent is evaporated off
- customto give a crude product which
- customis purified by chromatography on silica gel
Quellen und Nachweise
- ORD-Eintrag
- ord-965ee206233a4fb1afeca5f1d14537fb
- Quelldatensatz
- uspto-grants-1991_05
- Patentnummer
- US05013847
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