3-Buten-2-ol → HCID 22144839, compound

Temperature

140 °C

Nitrogen was bubbled through a mixture of 1.0 gm (4.65 mMol) 5-fluoro-7-bromobenzofuran, 0.61 mL (6.98 mMol) 3-buten-2-ol, 0.057 gm (0.186 mMol) tri(o-tolyl)phosphine, and 0.47 gm (5.58 mmol) sodium bicarbonate in 35 mL N-methylpyrrolidinone for 10 minutes. To the mixture were then added 0.021 gm (0.093 mMol) palladium(II) acetate and the reaction mixture was heated to 140° C. for 3 hours. The reaction mixture was cooled to room temperature and diluted with 500 mL ethyl acetate. The organic phase was washed sequentially with three 500 mL portions of water and 500 mL saturated aqueous sodium chloride, dried over magnesium sulfate and concentrated under reduced pressure. The residue was subjected to silica gel chromatography, eluting with a gradient of hexane containing from 0–20% ethyl acetate. Fractions containing product were combined and concentrated under reduced pressure to provide 0.73 gm (76%) 4-(5-fluorobenzofur-7-yl)-2-butanone as a yellow oil.

1. temperatureThe reaction mixture was cooled to room temperature
2. washThe organic phase was washed sequentially with three 500 mL portions of water and 500 mL saturated aqueous sodium chloride
3. dry with materialdried over magnesium sulfate
4. concentrationconcentrated under reduced pressure
5. washeluting with a gradient of hexane containing from 0–20% ethyl acetate
6. additionFractions containing product
7. concentrationconcentrated under reduced pressure

ORD record

ord-4e79ac1379a44884853d2a62d13ba32c

Source dataset

uspto-grants-2006_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07045545B1