Formamide → 2-Fluoro-4-(thiazol-4-yl)phenol

To a stirred solution of phosphorus pentasulfide (8.6 g, 19.3 mmol) in dioxane (53 ml) was added formamide (5.2 g, 115.5 mmol), and the mixture was heated at reflux temperature for 2 hours. The mixture was cooled down to room temperature, and the solution was decanted away from solids. To a stirred solution of 2-bromo-1-(3-fluoro-4-hydroxyphenyl)-1-ethanone (3.02 g, 12.98 mmol) in dioxane (50 ml) was added the thioformamide solution, and the mixture was heated at reflux temperature for 6 hours. The mixture was cooled down to room temperature, and made basic by addition of 0.5M NaOH aqueous solution. The whole was extracted with ethyl acetate. The organic layer was washed with brine, dried over MgSO4, and concentrated in vacuo. The residue was purified by flash chromatography eluting with ethyl acetate-hexane (1:3) to give title compound (2.11 g, 83% yield).

1. temperaturethe mixture was heated
2. temperatureat reflux temperature for 2 hours
3. customthe solution was decanted away from solids
4. temperaturethe mixture was heated
5. temperatureat reflux temperature for 6 hours
6. temperatureThe mixture was cooled down to room temperature
7. extractionThe whole was extracted with ethyl acetate
8. washThe organic layer was washed with brine
9. dry with materialdried over MgSO4
10. concentrationconcentrated in vacuo
11. customThe residue was purified by flash chromatography
12. washeluting with ethyl acetate-hexane (1:3)

ORD 기록

ord-e47de7ac2fc742619e5fe700be352675

출처 데이터셋

uspto-grants-2004_04

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US06727238B2