反应详情

To a solution of ethanol (4.2 ml) in tetrahydrofuran (65 ml) was added a solution of triphenylphosphine (13 g) and 5-fluoro-2-nitrophenol (10 g) in tetrahydrofuran (65 ml). To this solution was added diethyl azodicarboxylate (10 ml) under ice-cooling and the mixture was stirred at room temperature for 4 hr. The reaction mixture was concentrated under reduced pressure and diisopropyl ether was added. The precipitated crystals were collected by filtration and concentrated under reduced pressure. The concentrate was subjected to silica gel column chromatography (developing solvent; hexane:ethyl acetate=4:1) to give a yellow oil. To this oil was added ethyl acetate, washed with an aqueous sodium hydroxide solution, dried over magnesium sulfate and concentrated under reduced pressure to give the title compound (9.6 g) as a yellow oil.

1. temperaturecooling
2. concentrationThe reaction mixture was concentrated under reduced pressure and diisopropyl ether
3. additionwas added
4. filtrationThe precipitated crystals were collected by filtration
5. concentrationconcentrated under reduced pressure
6. customto give a yellow oil
7. washwashed with an aqueous sodium hydroxide solution
8. dry with materialdried over magnesium sulfate
9. concentrationconcentrated under reduced pressure