Reaktion #43451

Reaktionsgleichung

2,3-dihydro-1-benzofuran-5-carbaldehyde

sodium acetate

bromine

→

desired compound

Ausbeute 91.3%

7-bromo-2,3-dihydro-1-benzofuran-5-carbaldehyde

Ausbeute 91.3%

Lösungsmittel

acetic acid

sodium thiosulfate

Reaktionsbedingungen

Aufarbeitung

1. 1
   Waschenwashed with a saturated aqueous solution of sodium bicarbonate
2. 2
   Extraktionextracted with ethyl acetate
3. 3
   Trocknendried over sodium sulfate
4. 4
   Sonstigedried in vacuo

Vorschrift

To a solution of 2,3-dihydro-1-benzofuran-5-carbaldehyde (1.0 g, 6.75 mmol) in glacial acetic acid (8 ml) was added sodium acetate (664 mg, 8.1 mmol) and bromine (0.7 ml, 13.5 mmol) at 10° C. slowly. The reaction was stirred for 2 h at room temperature. The reaction was diluted with a saturated aqueous solution of sodium thiosulfate (10 ml), washed with a saturated aqueous solution of sodium bicarbonate, and then extracted with ethyl acetate. Organics were combined, dried over sodium sulfate and dried in vacuo to give the desired compound (1.4 g, 91%).

Quelle