Water → Ethyl 5-bromofuran-2-carboxylate

To a solution of 2-bromo-5-carboxyfuran (10 g) in dimethyl sulfoxide (100 ml), potassium carbonate (7.96 g) was added at 15 to 30° C. and ethyl iodide (16.8 ml) was added dropwise thereto. The mixture was stirred for 15 hours. The reaction solution was then poured into water and extracted with chloroform. The organic layer was washed with water, a saturated aqueous sodium hydrogencarbonate solution and a saturated aqueous NaCl solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was separated using silica gel column chromatography (hexane:ethyl acetate=2:1) to obtain 11.34 g of the desired product as an oil.

1. extractionextracted with chloroform
2. washThe organic layer was washed with water
3. dry with materiala saturated aqueous sodium hydrogencarbonate solution and a saturated aqueous NaCl solution, dried over anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe resulting residue was separated

ORD record

ord-549ee2efa5174a54b00f307d8d3be074

Source dataset

uspto-grants-2004_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06673797B1