反应详情

To a solution of 2-chloro-4-fluoro-5-nitrophenol (19.1 g) in acetonitrile (100 ml), there was added anhydrous potassium carbonate (8 g). After stirring at room temperature for several minutes, propargyl bromide (14 g) was added thereto, and the resultant mixture was heated under reflux for 3 hours. After being allowed to cool to room temperature, water was added thereto, and the reaction mixture was extracted with ether. The ether extract was washed with a 5% aqueous sodium hydroxide solution and water in this order, dried over anhydrous magnesium sulfate and subjected to filtration. The filtrate was concentrated under reduced pressure, and the residue was recrystallized from ethanol to obtain 13.5 g of 4-chloro-2-fluoro-5-(2-propynyloxy)nitrobenzene. M.P. 88°-89° C.

1. temperatureunder reflux for 3 hours
2. temperatureto cool to room temperature
3. extractionthe reaction mixture was extracted with ether
4. extractionThe ether extract
5. washwas washed with a 5% aqueous sodium hydroxide solution and water in this order
6. dry with materialdried over anhydrous magnesium sulfate
7. filtrationsubjected to filtration
8. concentrationThe filtrate was concentrated under reduced pressure
9. customthe residue was recrystallized from ethanol