Sodium Hydroxide → 5-Bromo-2-methyl-1-benzofuran

A solution of 2-[(4-bromo-2-formylphenyl)oxy]propanoic acid (5.08 mmol) in acetic anhydride (6 mL) was treated with sodium acetate (15.25 mmol). The resulting solution was heated to reflux and stirred overnight. The brown reaction solution was allowed to cool to room temperature, and was diluted with toluene (10 mL). The solution was then treated with 1N aq NaOH (10 mL) and was stirred at room temperature for 20 min. The solution was then further diluted with water (50 mL) and was extracted using ethyl acetate. The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo. The resulting brown residue was purified by flash chromatography (hexanes), affording the title compound as a clear oil (660 mg, 62% yield). 1H NMR (400 MHz, DMSO-d6) δ ppm 7.73 (d, J=2.02 Hz, 1H) 7.47 (d, J=8.59 Hz, 1H) 7.35 (dd, J=8.72, 2.15 Hz, 1H) 6.58 (s, 1H) 2.45 (d, J=1.01 Hz, 3H).

1. temperatureThe resulting solution was heated
2. temperatureto reflux
3. stirringwas stirred at room temperature for 20 min
4. extractionwas extracted
5. dry with materialThe combined organic layers were dried over magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe resulting brown residue was purified by flash chromatography (hexanes)

ORD-Eintrag

ord-e505a6513e7c41dfb554394d67a54b49

Quelldatensatz

uspto-grants-2014_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08802864B2